862 vs 243 heads

Written by Agvxxunm NbxbtbrvLast edited on 2024-07-04
87LC2. This is rarely brought up, but the combustion chamber design of the L92/Ls3 heads is superior to the .

The 241 castings feature 205cc intake ports, 70cc exhaust ports, and a 2.0/1.55 valve combination. The hot factory heads would be the LS6 (243 castings), but even the stock LS1 heads can be made ...I swapped the heads for a set of patriots before the engine was ever run. I would like to get $550 shipped as these are brand new heads. ... LS2 heads 243 casting ... Casting 862 Heads. By 1badmonza in forum Internal Engine Replies: 7 Last Post: 12-30-2010, 10:07 AM. Question: casting # on heads.The Pro 243 irons also feature a wider flow microslot than the 223s which made for better low-face forgiveness. They also feel smoother through the turf. The Mizuno Pro 243 irons retail for $1400. Overall. Given that the Pro 223's and 243's are meant to be the more forgiving Mizuno models, the Mizuno Pro 243's do in fact surpass the 223's.Get the best deals for 862 heads at eBay.com. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Skip to main content. ... GM LS 706 806 862 241 799 862 243 CYLINDER HEAD REBUILD SERVICE 3 BUISNESS DAY. Opens in a new window or tab. Remanufactured. $459.99. Save up to 10% when you buy more. Buy It Now.Get ready to feel the G-forces as we navigate the exhilarating terrain of power and performance. 862 LS Heads aren’t just components; they’re the driving force behind an automotive revolution, and the journey has only just begun! DIY Adventure: Installing 862 LS Heads Like a Pro. Time to get hands-on, gearheads!The difference from one 243 head to another is the guy doing the port work. You can get $1100 243 heads and you can get $2000 dollar 243 heads im sure. Its been said you get what you pay for. Trickflow is a great cylinder head for the money, and with the right setup and supporting mods ive seen nothing but big gains from trickflow heads. 243's ...118. Intake valve is 2" on the 241, exhaust valve is same size as the 862. If planning on 241 heads on a 5.3 you will lose compression and hp. The Fleet... 2003 Suburban- 5.4 L59 331CI 10:5.1 Compression -Built by ME. 2004 Avalanche- 5.7 LS1 -NOT built by me. 2005 Silverado RCSB- 5.7 LS6 -Built by ME. Reply With Quote.243 heads on 5.3l. Thread starter riccotxtre; Start date Jun 26, 2020; Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission. Jun 26, 2020 #1 R. riccotxtre TYF Newbie. Joined Jun 19, 2015 Posts 14So what the difference between some milled 862s and some stock 243s? Also how big of a difference would the 243s and a nnbs intake do on a 2003 4.8?The engine also had 799 or 243 casting heads which are closely related to the LS6. The engine has flex-fuel capability. In 2010, the LC9 gained VVT as well as pistons with valve reliefs, and compression dropped from 9.9 to 9.6:1. … For LC9 engine specs, read this: LC9 5.3L Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs ...LET'S TALK TECH, ANYONE EVER SEE A SET OF STOCK 243 HEADS FLOW 270+ CFM? WE COMPARED 243 HEADS TO 862 HEADS, PORTED, …ported 243s, ls2 stock shorty + cam. procharged. 740~whp. That sounds healthy. If I can pull off 700 rwhp like that through my A4 for the time being with 234's or 317's I think I'll be satisfied. SOFAKINGGR8 said: Numbers in sig, recently made over 700whp a few weeks ago, and have been over 600whp since April.The 862 heads are inferior to the 706 heads in terms of compression, and they don’t also flow well like the 243 heads because it doesn’t have other competitive features; however, depending on your car’s needs and budget, the 862 cylinder heads might be a good port for you.7477 posts · Joined 2005. #5 · Jul 14, 2010. The .040" Cometic gaskets will raise compression ratio, not lower it. That said, the GM MLS gaskets seal up the best and are a decent price. I got mine from Texas Speed. Get the LS1 gaskets that are 3.910" bore diameters. That's what I used and I have no problems.The 862 heads are commonly used in a variety of GM vehicles and can be an excellent choice for street-driven cars and trucks where low-end torque is essential. 3. The 317 Cylinder Heads. Specifications. On the other hand, the 317 cylinder heads are also produced by General Motors but are favored for different reasons.I am beginning to find and spec all the parts I need to start the 6.0L LS swap for my 2002 Silverado. A significant key to the success of this build is the c...Aug 2, 2010 · Compression Ratio & Combustion Chamber Size. I'm looking to install a set of 243/799 heads on my 5.3. The stock heads have a combustion chamber volume of 61.15cc, and 243/799 heads have a volume of 64.45cc. My stock compression ratio is 9.5:1. I already know that I need to mill the heads .007" to lose 1cc of volume.Mar 21, 2012 · For cam choices, we went right to the Comp Cams catalog and selected cam profiles designed specifically for the cathedral and rectangular-port heads. On the cathedral-port side, we chose a ...Ajit Mohan, the head of Meta in India, has left the firm and agreed to join rival Snap, according to sources familiar with the matter. Ajit Mohan, the head of Meta in India, has le...Oct 25, 2012 · If so, the 862 has a tiny 1.9 intake valve. The 317 head has 2.0 valve and a larger intake runner cc, like the LS6. The 862 in a good bench make 220ish cfm, 317s as much as 257 or so. Just has a larger combustion chamber.biscuit_08 said: I was jw cuz i seen it done on the ls1 and them makin more power with cnc ported heads i was just seein if it would do the same on a 6.0. The key word.. ported. In stock form its a downgrade. People use the 5.3 casting because of the smaller combustion chamber without milling the heads and changing the pushrod length.243 04 up LS6 aluminum center bolt 5.7 ***These castings were also used around 05 in truck applications*** 862 99 and up 4.8-5.3 Truck heads 706 99 and up 4.8-5.3 Truck heads 799 05 and up 4.8-5.3Truck heads ***reportedly came on a few corvette's too*** These are basically 243 Heads 873 99-00 LQ4 6.0 Iron center bolt headsHowever, the main distinguishing feature of the 862 cylinder head design is its unique ability to dramatically enhance air compression delivered following porting. While some may argue that the 243 heads are better, 862 heads deliver improved airflow, quality, performance, and power. Moreover, 862-cylinder heads are compatible with many cars.Price wise both companies are very close to each other. TEA Stage 2 Heads $1320 w/ 2.04/1.57 valves and dual springs. AI CNC Heads are $1245 w/ new stock valves and dual springs. It seems like the TEA has an obvious advantage in flow with the 2.04 intake valves but AI does not have any options for larger valves on their website.You will see 50+rwhp probably at same psi. 317/243 heads flow MUCH better than 862 truck heads. flow more at .400 lift than the 862's flow at .550 lift. Boost will also lover the bigger 2" intake valves. 243's with their smaller combustion chambers would be a better match. than the 317's.It uses a shorter case than the .243 Winchester—1.920-inch vs. 2.045 inches—allowing for a longer bullet length outside the case in the same length magazine, and maintains the 6.5 Creedmoor's 30-degree shoulder. Snow has found this extends brass life, as well as giving more room in the shortened case. The Hornady Precision Hunter load ...1. 243 Livernois Stage 2 heads 2. Kook's LTs 3. Mild cam (TR 224/224 112) The gain from those 3 mods was 102 rwhp over factory. I debated the 5.3 heads vs. the 243s, was never able to come to a definite conclusion, so for the slight bump in compression I used the .040 Cometic gaskets.1713 posts · Joined 2004. #5 · Apr 14, 2021. I have stage III ported 243 ls6 heads and cam on my LS1. Great setup, you should pick up some HP. 2004 GTO - Quicksilver A4 (437rwhp 371rwtq) Engine Mods: Livernois Stage III LS6 heads/cam | Cam - [email protected], Lift .568", LSA 114.Porting the 243 heads is an effective way to improve airflow into and out of the engine, as it involves modifying intake and exhaust ports for greater efficiency. With this modification, air flows more easily into the combustion chamber which results in increased power output. ... Which heads are better 706 vs 862? Sometimes the difference ...ddawson. 15570 posts · Joined 2004. #4 · Sep 29, 2008. The 317 is a 243 but with a larger CC. I have the 317 on my car with 70CC. 1969 Corvette, 427 Convertible. 496CI Edelbrock Heads, Quickfuel Carb, LS6 Intake. Straub Technologies 229/235 .590/.559 107, Hedman Headers, Magnaflow Exhaust. Speed Direct Rack and Pinion, Semi Coilovers ...Jun 22, 2021 · Working with the intake and camshaft, the cylinder heads are part of the trio of performance components that dictate the power output of the engine. In the case of the LS3 and (especially) LS7, the factory heads offer exceptional air­flow. Unlike cathedral-port heads (706, 317, 243, etc.), it is difficult to improve upon the power […]706 vs 862 heads - Thoughts on port/polish? My current LS is a stock LM7 out of a '05 Silverado with about 130k'ish miles on it (112k when pulled; about 20k on the swap). Only major change is the Holley Mid-Mount kit on the front and some generic block-hugger headers. Otherwise running stock 706 heads and stock truck intake with DBW throttle body.Running just 7 psi, the turbo system improved the power output by 243 hp. But the real question is, would the 706 heads still make more power under boost? After …242 posts · Joined 2007. #10 · Jul 10, 2009. Sleeper S10 said: The 5.3 L33 comes with LS6 Heads: L33 Vortec 5.3 325 Gen 3 Aluminun Engine Vin "B". 310 HP/ 5300 HO. LS6 Heads, Casting #799 (Originally developed for the ZO6) 9.9:1 Compression. Flat topped teflon coated pistons with floating wrist pins.45 posts · Joined 2006. #4 · Apr 12, 2010. I'll recommend TFS 215 heads and a 224/228 comp cam. A friend of mine has this package and I was really impressed. With a ported fast he made 450 rwhp and the car idled and drove great. It was actually a little tame for my taste, but sounds like what you're looking for.I ported my 862 heads on my LM4 5.3L with a SS2 cam I haven't re run the car yet but I'm sure it made a difference up top. It feels like it pulls harder on the top end and I had to add some fuel up top so that tells you right there its moving more air. It would take quite an effort to improve the port work of the 799, less so with the 862 but ...The 706 & 862 heads have a 61cc combustion chamber. Most of the other LS cylinder heads have larger combustion chambers. ... Also, the port velocity on the 706/862 head is much better than the 799/243, which will help you with the small bore of the 5.3. The 706/862 respond very well to a light runner cleanup and a good multi angle valve cut. If ...I'm having a hard time finding a set of 243 or 799 heads, so I was considering having my 317's milled approx. 25-30 thousandths and going with an .040 head gasket to bump up the compression. ... Lets compare the heads: Casting Number 706 / 862 Head: 1999+ LR4 4.8 Litre Truck 1999+ LM4 /LM7 5.3 Litre Truck Material: Aluminimum Combustion ...Showing the progress Porting the 862's for my Turbo 4.8 project. Yes it's a slow process and I limit how much I can do each day.I'm in the dirtiest portion ...862 s Vs 243 s..... So what the difference between some milled 862s and some stock 243s? Also how big of a difference would the 243s and a nnbs intake do on a …The Pro 243 irons also feature a wider flow microslot than the 223s which made for better low-face forgiveness. They also feel smoother through the turf. The Mizuno Pro 243 irons retail for $1400. Overall. Given that the Pro 223's and 243's are meant to be the more forgiving Mizuno models, the Mizuno Pro 243's do in fact surpass the 223's.Simply put, the .243 Winchester became the darling and the .244 Remington became the goat. The reviews took their toll, and the .244 Remington began to wither. In 1963, Remington made their first attempt at the name game. They revised the rifle and ammunition, equipping it with a 1:9″ twist rate in 1958 and renamed the cartridge the 6mm ...The 243 Heads are cast iron cylinder heads that have been CNC-machined to create larger intake and exhaust ports. The combustion chambers have also been machined to be smaller, which increases the compression ratio. While the 243 heads are not the newest or best option out there, they offer a great value for the price.It turned out 300hp/367TQ to the rear wheels. From what I've researched parasitic loss in rigs setup similiar is much higher than 30%. Other people have experienced 40-55%. That puts mine at 500-550. With the additional displacement in your engine, 540 sounds right.#1 · Dec 3, 2013. i want to know if I would pick up anything swapping in STOCK 243s heads in place of stock 862 truck heads that i am currently running. i recently put a bigger cam in the car and picked up zilch.zero.nada and im wondering if im at the limit of the 862s.Brawler LS3 Style CNC Ported Cylinder Heads w/ TSP .660" Spring Kit and Titanium Retainers $ 1,836.99. PRC 15-Degree 220cc As-Cast Cathedral Heads $ 1,820.69.The 243's have bigger valves which do better on 4.0" and larger bores. On the smaller 3.898/3.78" bores of the LS1/6 & all 5.3/4.8's the 706 are very decent. On a 4.00" bore of an LQ4 though it is splitting hairs. On the same cam, on the same engine, the heads are going to perform within +/- 5hp/5tq of each other, it is almost meaningless.The cheapest way is to have your 243 heads ported, probably less than $1000 without labor and tuning. Patriot heads are about $1300+/-. Most other aftermarket heads will be over $2000 for the heads alone. You can get a whole L92/L76 swap kit for about $2100. To get a Ls2/Ls6 head to flow what a L92/Ls3 head flows will take a lot of work, and ...Tested on a different application, the results would certainly be different. On many of the heads, the results varied by only a couple of horsepower. In the grand scheme, that's insignificant....The LS engines with 799 heads are 5.3L and 4.8L. The sophisticated architecture, cathedral-shaped port, and smaller combustion chamber work amazingly on these truck engines. The smaller combustion chamber with a higher compression ratio offers increased power output. The 799 LS heads boost horsepower up to 25 hp.Justin Cesler Writer Feb 28, 2013. Porting cylinder heads has long been a right of passage for serious hot rodders looking to add power on a modest budget. Armed with the right knowledge, the ...Unless your building something something over 7000rpm an OEM head is the way to go. People routinely get 1000hp out of them. On 4.8, 5.3, 5.7, NA 6.0 - I always recommend the 243. Maybe even milled a touch if needed. On 6.0+ the 823 variant of the rectangular head is great. 65 Chevelle Malibu 2dr HT LS Swapped.Get ready to feel the G-forces as we navigate the exhilarating terrain of power and performance. 862 LS Heads aren’t just components; they’re the driving force behind an automotive revolution, and the journey has only just begun! DIY Adventure: Installing 862 LS Heads Like a Pro. Time to get hands-on, gearheads!The price difference for 799 an 241 heads is because the 799 is a twin to the 243 an have better ports an 64.54cc chambers where the 241/853s have not as large of a port an are 67cc..your 862 is actual the smallest chamber head being 62cc but their down side is smaller valve size an slightly less flow then 241/853 heads..Mar 13, 2018 · Run with the 317 heads, the modified 5.3L produced 448 hp at 6,800 rpm and 398 lb-ft of torque at 5,000 rpm. After installation of the 706 heads, the power jumped to 468 hp at 6,800 rpm and 413 lb ...431 posts · Joined 2019. #9 · Jan 5, 2021. 706 heads out perform all others on a 4.8. Throughout the entire normal rpm range. It's not all just about flow. Those larger flow numbers from other heads are misleading. Yes they flow more than 706 however, only beyond 6000rpm. 706 heads are the best for the 4.8.1231 posts · Joined 2007. #1 · May 12, 2013. Have a stock bottom and 5.3. The heads on it right now are 862's. I'm approaching 20psi on the engine. Would it be worth it to switch to some ported and milled .025 317 heads? Running pump gas/c16 mixed. 1980 Chevy luv truck. Stock 6.0.While this is the case, all of the work he put into doing that with stock 862 heads is barely worth the gain. He would have been better off slightly milling and porting the intake and exhaust ports as well as having LS1 sized valves installed. ... I thought the 2004 GTO had 243 heads My ride is a 2002 Camaro SS SLP #3296 with 30k, LTH, 3" Y ...There are significant differences between the LS1 and LS2 cylinder heads. The main function of cylinder heads is to control the inflow and outflow of air in the engine. One key difference is that LS2 cylinder heads allow more airflow as compared to LS1 heads. Further, the combustion chamber of LS1 has a volume of 67cc, which is larger …ddawson. 15570 posts · Joined 2004. #4 · Sep 29, 2008. The 317 is a 243 but with a larger CC. I have the 317 on my car with 70CC. 1969 Corvette, 427 Convertible. 496CI Edelbrock Heads, Quickfuel Carb, LS6 Intake. Straub Technologies 229/235 .590/.559 107, Hedman Headers, Magnaflow Exhaust. Speed Direct Rack and Pinion, Semi Coilovers ...NEW GM LS 243 HEAD - 4.8L, 5.3L & 6.0L. $349.99. Generation III V8 cathedral intake port cylinder head. Casting 12564243. For truck, van, SUV and perfomance applications. Used on LS6, L33, L20, LH6, LY5, LMG, LC9,LS4, LH8, LS2, LFA, LZ1 engines. Add to Wishlist. Skip to the end of the images gallery. Skip to the beginning of the images gallery.Feb 18, 2024 · 706 heads tend to be more popular than 243 heads with those who run naturally aspirated engines. While they don’t have the same size combustion chamber they also don’t have the tendency to lower the compression ratio and reduce horsepower. When looking to replace your heads, they offer a high degree of consistency since they are ...If the 706, 243, or the later 799 is the go-to head for any engine, the 317 is just right behind. It's designed with the same ports as the 799 and 243 types but with larger chambers. ... 706 Vs. 862 Heads. The 706 model is made to be superior to the common 862. The semi-permanent mold (SPM) method is a consistent process. ...After installation of the heads, offset rockers, and FAST LSXR intake, the LS3-headed stroker pumped out 581 hp and 543 lb-ft of torque. Note the LS3 heads increased both peak power and torque, though the rec-port heads did lose out to the 317s below 4,000 rpm. Despite the slight loss down low, torque production with the LS3 heads bettered 500 ...243 04 up LS6 aluminum center bolt 5.7 ***These castings were also used around 05 in truck applications*** 862 99 and up 4.8-5.3 Truck heads 706 99 and up 4.8-5.3 Truck heads 799 05 and up 4.8-5.3Truck heads ***reportedly came on a few corvette's too*** These are basically 243 Heads 873 99-00 LQ4 6.0 Iron center bolt headsAnd yes, non offset rockers from a 317 head will work on the 243 heads. thats pretty impressive, some big numbers hoping ill crack 420whp+ with 364 cubes with 243s I've read so much garbage about the rod bolts i really don't know if i should replace them with arp or leave them in, its a 50/50 discussion on if you're going to have to resize or ...In terms of cylinder heads, we included the 706 small-valve 5.3L heads, the 241 (LS1), 317 (6.0L truck), and 799 (as a stand-in for the hallowed 243) heads. The …The 243 heads are, as far as i know, the best factory casting to go with based on the chamber design. Even though our stock heads flow very close to them(or the same), the 243 heads are supposed to have a quench pad in the design and offer better compression. The info i have lists the 243 heads at 65 cc so with the stock gasket you would be ...I know stock vs stock the 243 is the superior head but my engine came with 706 non crack-tec heads and I'd like to use them if I could. My question is what performs better, a stock 243 or a professionally hand ported 862/706 because for the price of 243s I could have my 706s hand ported and flowed by a well known drag racer/engine builder in my area.More video to come. Put new heads and new cam in my 6.0 lq4 283 int/286 exh 114 LSASimply put, the .243 Winchester became the darling and the .244 Remington became the goat. The reviews took their toll, and the .244 Remington began to wither. In 1963, Remington made their first attempt at the name game. They revised the rifle and ammunition, equipping it with a 1:9″ twist rate in 1958 and renamed the cartridge the 6mm ...This head is intended for blocks that feature a minimum cylinder bore diameter of 4.00 inches. The LS3 cylinder head has 260-cc intake runners and 92-cc exhaust ports. In addition, it has a combustion chamber volume of about 68.4 cc. These heads fit any LS engine with cylinder bores of 4.000 inches or larger.Swapping in 243 heads will increase flow a little, but unless you mill them first, you'll lose compression. If anything, you want to raise compression. For just a basic bolt-on 5.3, the 862 heads will do a decent job. ... The 706 and 862 castings aren't different, much like the 799 and 243 castings are identical. If you have 862s, I would ...The 243 Heads are cast iron cylinder heads that have been CNC-machined to create larger intake and exhaust ports. The combustion chambers have also been machined to be smaller, which increases the compression ratio. While the 243 heads are not the newest or best option out there, they offer a great value for the price.After installation of the heads, offset rockers, and FAST LSXR intake, the LS3-headed stroker pumped out 581 hp and 543 lb-ft of torque. Note the LS3 heads increased both peak power and torque, though the rec-port heads did lose out to the 317s below 4,000 rpm. Despite the slight loss down low, torque production with the LS3 heads bettered 500 ...Chinese authorities are investigating Meng Hongwei, who has been missing since late September, for taking bribes. Two years ago, Meng Hongwei became the first Chinese person to hea...Remember that the '461X heads were used in 1961, 1962 and 1963 with valve sizes 1.94/1.50 only. The revised 461 heads were available starting in 1964 models with either 1.94/1.50 or 2.02/1.60 valves, depending on application. The later 461 or 462 heads would be my choice for a nostalgic look and high performance.If you know how to look for heads you can buy them cheap if you know what trucks they came on. Go here and look, I have seen them as cheap as $100 a head. www.car-part.com. 2013 inferno orange ZL1 Camaro, basic mods. Pulley, injectors, mild bolt on's- 590rwhp. 11.70@122 with a six speed and a hard tire.Aluminum vs aluminum construction - Both 862 and 243 heads are cast aluminum. This means they have the same weight and heat dissipation properties. So in summary, 862 LS heads offer performance advantages of higher durability, better torque, and easier installation. The stock 243 heads are not a big restriction for making power on otherwise ... Apr 2, 2020 · In a comparison of the cammed 243 head and the cammed rectangle-port LS3 head, the LS3 torque pea

GM 4.8 5.3 V8 C#706, 862 Assembled Cylinder Head. $499.99. Quantity. Add to Cart. This Chevy GMC Head is a new and improved casting. The cylinder head is either sold complete with all new parts or bare. This is OEM replacement quality at a fraction of the cost. This Cylinder Head has an industry leading 2-year Warranty.LS1 LS6 243 / 799 Aluminum Cylinder Head CNC Porting Service ( Customer Supplied Bare Heads ) CNC Ported LS1 243 / 799 Cylinder Heads, Customer Supplied Bare Casting heads. $599.95. Options. Valve Job with new Valve Guides + $400.00. Resurface for MLS Gaskets + $150.00. Cylinder head Assembly + $150.00.The 243 having a blunt front end, you would expect it to be slower than the pointy 6.5 front tip. However, its body build allows for a larger volume of powder, which boosts its muzzle velocity significantly. Although both cartridges recorded high speeds, there is a slight difference that sees the Grendel lose.See my Signature for full the mods. I have comp cam 222/224 566/568 112lsa. Yes 05 has 6.0L motor vs 5.7L. If you are just make a swap from stock 241's to stock 243's then 15-20rwhp would be a "safe" expectation..... maybe use a cometic gasket set to get the CR up a bit and the quench better for some extra power.www.texas-speed.comFeb 9, 2022 · Factory has the 862 heads. I’ve been offered a 5.3 block with 243 heads on it for $300. Would the stock 243 heads work better on it than the 862 heads? Obviously they need to go to the machine shop to be looked over but without any alterations to the stock form, which is the better head? Engine is stock other than cold air intake.The 243/799 heads made more power than the 317's in back to back N/A, and boosted, dyno pulls on the same motor. Sounds to me like you've already convinced yourself the 317 is the better head, so I'm not sure why your on here asking. Besides, from your post, headers are too small, so the head choice may be irrelevant.The exhaust port is a unique D-shape that improves flow. LS6 heads are the best choice only when all-out power is needed. Be prepared for a big price tag at the dealer or steep core charge from your head porter. 706 & 852 & 862 Head: 1999+ LR4 4.8-liter Truck 1999+ LM4 / LM7 5.3-liter Truck Material:Aluminum Part Number: 12559852, 12561706,12559862Start with squeezing your quench by using a thinner head gasket. A 0.040" gasket will give you an optimal quench distance and substantially reduce detonation, meaning you'll be able to run more timing. If you still haven't reached your SCR/DCR goals, I'd start removing material. 2004 Pulse Red M6.MLS Head Gasket for Notched 853, 862, 806 LS Heads. Fits 1997-2013 4.8L 5.3L 5.7L LS-Based V8 Engines. These gaskets are specifically designed for the 2001-earlier LS1, 4.8L truck and 5.3L truck heads that have a "notch" in the cylinder head deck, preventing them from sealing with a conventional MLS gasket. Can also be used on the later heads ...By Paul Johnson - March 9, 2016. This article applies to Chevrolet Camaro and Pontiac Firebird (1998-2002), as well as all LSx engines. The cylinder head (or "head") has several main functions. Its first order of business is …I know 243's are good but didn't know if 862's are any good when they're right in front of me. They won't flow as good as 243 but you'll have better compression vs 243. You can have them ported for a reasonable price and have a good valve job done on them to make them perform. They'll never be rock stars but they'll do fine with that cam.PRC LS3, L92, & LSA CNC Cylinder Head Porting (Customer Supplied Castings) $ 899.99. Cometic Ford 5.0L Gen-1 Coyote / 5.2L VOODOO Modular V8 Intake Manifold Gasket Set $ 29.23. Cometic Ford 5.0L Gen-1 Coyote Modular V8 .027" MLS Cylinder Head Gasket, 94mm Bore, LHS $ 132.74. Military And Law Enforcement Discount . CONNECT WITH US.The 799 head is designed and made to be compatible with high-performing LS engines, such as 4.8L, 5.3L, 5.7L, or 6.0L, etc. These vehicles require maximum airflow, making the 799 head an ideal choice. On the other hand, the 862 head is compatible with LR4, LM4, and LM7 and such engines where low torque is more essential than better horsepower.oil catch can, Pacesetters LT Headers,3500 Stall, K&N CA, bmr drag bags. We can port and valvejob your 243's, install the larger 2.02"/1.57" stainless valves, and the PRC .650" lift dual springs all for $1200. That makes them the equivalent of our PRC Stage 2.5 heads, just with your used castings. Additional milling is free of course.5.3 chevy LS heads 862 to 241 Casting. I recently completed my 5.3 swap in my 90 wrangler, long story short I have a bad valve on cyl #8 low compression. So I was intent on having them rebuilt and called my machine shop, machine shop says he has a set rebuilt someone left and never came back to get, for the same price as having mine rebuilt. So ...The story of Newton discovering gravity by getting hit in the head with an apple is a classic. Is there any truth to it? Find out at HowStuffWorks. Advertisement In 1666, the Great...The factory-built motor dished out about 430 horsepower right out of the gate, and the cylinder heads play no small role in that impressive output. The LS3 heads hit the flow bench. The LS3's 319-T5 aluminum alloy cylinder heads use 2.165 in (55.0 mm) intake valves, 1.59 in (40 mm) exhaust valves, and a 15 degree valve angle.Which factory LS cylinder head works best with a turbo, 706 or 317? It's the age-old comparison, airflow vs compression. This LS head shoot out between the s...Location: My own internal universe. Posts: 10,446. Likes: 134. Received 1,837 Likes on 1,145 Posts. They won't flow as good as 243 but you'll have better compression vs 243. You can have them ported for a reasonable price and have a good valve job done on them to make them perform. They'll never be rock stars but they'll do fine with that cam.The 799 and 862 heads have their own pros and cons. While the 799 heads offer better flow and performance, the 862 heads offer better combustion chamber design and improved efficiency. Ultimately, the choice depends on the specific needs and goals of the engine. Pros of Using 862 Heads. Cons of Using 862 Heads.stock 862 heads vs stock 243. Jump to Latest Follow 54K views 39 replies 8 participants last post by 71 chevy Dec 11, 2013. 7. 71 chevy Discussion starter 1938 posts · Joined 2009 Add to quote; Only show this user #1 · Dec 4, 2013. i want to know if I would pick up anything swapping in STOCK 243s heads in place of stock 862 truck heads that i ...Speed Works has teamed up with Wilkes Performance to bring you the most powerful heads available. We have a few options you can purchase such as a pair of Stage 1, Stage 2, Stage 3, or Stage 4 LS 706/862 Cathedral casting 5 axis CNC Porting with stainless valves and WP .660 dual race springs with WP titanium retainers.Casting number 862 or 706 heads were used and sported a 61cc chamber but had tiny 1.890 intake valves. The stock heads can be CNC-ported for more airflow and milled up to .030 inch for more compression. Flow numbers can be as high as 325 cfm at .600-inch lift. Lightweight, hollow-stem LS3 valves can be cut to 2.040 inches to fit the seats.862 Heads This site contains Ebay partner affiliate links, which may earn us a commission at no additional cost to you. Gm Chevrolet Gmc 4.8l 5.3l Cylinder Head 862 Assy W Rocker ArmsMore video to come. Put new heads and new cam in my 6.0 lq4 283 int/286 exh 114 LSA. More video to come. Put new heads and new cam in ...Dec 28, 2011 · Casting Number 706 and 862 Head: 1999+ 4.8L / 5.3 Liter Truck Material: Aluminimum Part Number: 12559862 12561706 Combustion Chamber Volume: 61.15cc Compression Ratio: 9.5:1 Intake Port Volume: 200cc Exhaust Port Volume: 70cc Intake Valve Diameter: 1.89 inches Exhaust Valve Diameter: 1.55 inches Stock Head Flow NumbersRPO L99 and LS3 cylinder heads are aluminum with 68cc combustion chambers, rectangle intake ports with 257cc runners, D-port exhaust with 87cc runners, 2.165˝ intake valves and 1.590˝ exhaust valves. These heads can be CNC-ported to improve on flow and milled for higher compression. These heads are almost the same, but the L99 heads used a ...If you are just installing stock heads with no work, forget the 5.3 heads and just get a set of decent 243 heads which will still bump CR up 1/2 point on the LS1 (64cc combustion chambers compared to 66 CR of the 241 heads). 2004 torrid red with red interior A4 GTO (1 of 499)We may earn a commission for products purchased through links on this pageThe 243 heads came on the powerful LS6 engines from 2001 to 2006. Although the heads were initially made for C5 Corvettes, they later found their use in engines like the truck-spec LQ9 and LQ4. The LQ4 and LQ9 had 6 cc larger combustion chambers. LS6 was also used in some Camaros and Pontiac GTOs. The 243 heads are cast out of aluminum alloy ...I am beginning to find and spec all the parts I need to start the 6.0L LS swap for my 2002 Silverado. A significant key to the success of this build is the c...By Paul Johnson - March 9, 2016. This article applies to Chevrolet Camaro and Pontiac Firebird (1998-2002), as well as all LSx engines. The cylinder head (or "head") has several main functions. Its first order of business is …I know stock vs stock the 243 is the superior head but my engine came with 706 non crack-tec heads and I'd like to use them if I could. My question is what performs better, a stock 243 or a professionally hand ported 862/706 because for the price of 243s I could have my 706s hand ported and flowed by a well known drag racer/engine builder in my area.Dec 24, 2017 · In terms of cylinder heads, we included the 706 small-valve 5.3L heads, the 241 (LS1), 317 (6.0L truck), and 799 (as a stand-in for the hallowed 243) heads. The idea was to flow and measure each ...The 243 heads flow 10 cfm more on the intake side, and like 7 cfm more on the exhaust side (if memory serves me correctly). The combustion chamber is a difference of 3cc smaller on the 243's. Valve sizes are identical in both sets of heads. I know that when replacing heads you should have them worked (e.g.- valve job, and such).Previously, we compared the stock 706/862 heads to the 799/243 heads on a cammed 5.3L test motor. There was much uproar among 799/243 head enthusiasts. Than...GMPP CTS-V Race lifters C5-R timing chain Improved oil pan baffle. That's it. There are some more details in my build thread, but it's basically a more durable, stock LS1 with a cam. It made 401/401 with a safe tune. It is good when the 100 treadwear tires warm up get sticky. And yes, non offset rockers from a 317 head will work on the 243 …Jul 10, 2022 · You are much better off with the 706/862 heads from a compression standpoint. Also, the port velocity on the 706/862 head is much better than the 799/243, which will help you with the small bore of the 5.3. The 706/862 respond very well to a light runner cleanup and a good multi angle valve cut.Talking about cleaning heads and valves. Discussed when a valve job is needed compared to recommended. Chamfering the edges of the combustion chambers after ...We have a few options you can purchase such as a pair of Stage 1, Stage 2, Stage 3, or Stage 4 LS 243/799 Cathedral casting 5 axis CNC Porting with stainless valves and WP .660 dual race springs with WP titanium retainers. These heads have been disassembled, inspected, cleaned, 5 angle valve job, and milled slightly to clean up the heads.The 862 heads are inferior to the 706 heads in terms of compression, and they don’t also flow well like the 243 heads because it doesn’t have other competitive features; however, depending on your car’s needs and …Of course, today’s 5.3 and 4.8 both have 243 heads that are factory-designed. 243 heads were included in the LS6 engine produced between 2001 and 2006. You can determine the 243 heads on the 5.3 by examining the three-digit stamping next to the valve cover. The Sierra 1500 and Silverado from GM produced between 1999 and 2013 had 243 heads.CHICAGO, IL / ACCESSWIRE / April 17, 2023 / A challenge in analyzing these Global Annual Reports is that there are no standard headings like there... CHICAGO, IL / ACCESSWIRE / Apr...To help your comparison a little more, the ported 241 castings flow a max of about 295-300 CFM and are 215 CC's after porting. The ported 243's flow a max of 315-320 CFM and are 225 CC's after porting. In our experience, apples to apples the ported 243's are worth about 20 RWHP over ported 241's (with a similar torque curve down low).The 799 heads are superior to the 243 heads for automobiles because it is more efficient. Because it has a larger capacity, the Chevy 799 heads are better than the 243 heads. Most cars with 4 or 6 cylinders can use the 243 heads. Compared to its rival, the 799 cylinder head, it has more ports for greater air intake and exhaust flow, resulting ...Section 3: Understanding the Difference of 243 Heads. The LS 243 heads are an upgrade over the earlier LS 241 heads. While the 241 heads are also cathedral port heads, the 243 heads offer several improvements. The 243 heads have larger combustion chambers, bigger valves, and improved port designs, allowing for increased airflow and improved ...The heads on it right now are 862's. ... If you can get the 317 heads for a good deal you should be able to make more power at the same psi if they are ported good . ... ^^^ This ir run down some ported 243/799s would be good. You can usually run across some ported 243s for a decent price.which stock ls head makes the most power? should i upgrade my stock 6.0l heads? do cathedral-port heads make more torque than a rec-port heads? what about th...My question is what performs better, a stock 243 or a professionally hand ported 862/706 because for the price of 243s I could have my 706s hand ported and …Get the best deals for ls 243 heads at eBay.com. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Skip to main content. Shop by category ... GM LS 706 806 862 241 799 862 243 CYLINDER HEAD REBUILD SERVICE 3 BUISNESS DAY. Opens in a new window or tab. Remanufactured. $459.99. Save up to 10% when you ...Brawler LS6 Style CNC Ported Cylinder Heads w/ TSP .660" Spring Kit and Titanium Retainers $ 1,835.99. PRC LS3 Aftermarket 6-Bolt 260cc CNC Cylinder Heads $ 2,709.99. Precision Race Components Aftermarket LS3 As-Cast Cylinder Heads $ 2,101.19. Precision Race Components 2014 5.3L & 6.2L CNC Porting Service No 243s or 799 have the casting defect that I've heard, it was pretty isolated to the castech only 706's on gen II

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