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 headsDescription. CNC Ported LS2 - 243 CYLINDER HEADS - Flows 632HP @ .600" lift camshaft! Suits the 5.7ltr and 6.0ltr LS1 & LS2. LS1 LS2 CATHEDRAL PORT. These High Performance LS1 LS2 243 Cylinder heads are a CNC version of the High Performance replacement to the GM 243 heads. All factory mounting points with the Performance of a 243 port and chamber.Jan 21, 2022 · RPO 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 ...Aug 18, 2011 · 241 was used on 01-04 LS1 engines. They both have a 66.67 cc combustion chamber (10.1 CR), 200cc intake runners, and 70cc (round) exhaust ports. The 243 head is the 01+ LS6/LS2 head. It has a smaller 64.45cc chamber for more compression (10.5 CR on LS6), 210cc intake runners, and 75cc D-shaped exhaust ports.

link to camhttps://www.summitracing.com/parts/btc-trucknorrisLink to valve springs https://www.summitracing.com/parts/SUM-174002cam retainerhttps://www.summ...

Product Details. Lingenfelter offers a CNC ported version of the 243 casting aluminum cylinder head used on the 2001 - 2004 Corvette ZO6, Cadillac CTS-V and the 2005-2007 LS2 powered C6 Corvette, 2005-2006 GTO & SSR. The port and chambers are carefully designed to provide the best combination of high flow capabilities and improved port …I would think a 243 head is a 243 head, I think I read that the 243 was used on the LS6 Z and all LS2 motors had the 243 heads. Mr.Bill Reply Like. 09-27-2011, 08:43 PM #3 Eddie 70. Race Director . Member Since: Feb 1999. Location: Lenoir City Tennessee. Posts: 19,658 Likes: 59 Received 29 ...

The United States became an independent country on July 4, 1776. This means the country turned 243 years old in 2019. The United States of America formed after the colonies decided...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.No parent wants to think about losing track of their kids in a crowd, but it's best to be prepared just in case. No parent wants to think about losing track of their kids in a crow...the 862 heads are off of a 2000 5.3 while the 706 heads are from a 2005. I am wondering in terms of flow,compression,ect I will be using them on a 5.3 . Save Share. ... I know 243 and 799 heads on 5.3 is a popular swap, but never thought about shrouding issues. Either way, still an improvment over the stock heads!The 317s slightly larger runners and valves won't give you 4%. So if we were talking NA, I would agree the 862 would make slightly more power than a 317. Once you add a turbo though everything changes. With that 1pt of compression drop you can add a good 5-7psi.

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GM never made an iron LS1. Look at the front of the block and it will clearly have the displacement cast into it. If it is a 5.3, slap some 243's on it and a punchy mid range cam in it and it'll be a good street brawler. If it is a 4.8, some aftermarket heads with revised valve angles and dual valvesprings (TF Gen X 205 for example) and a cam ...When it comes to the GM's LM7 engines, the 862 cylinder heads are an integral part. Constructed from lightweight aluminum material, these cylinder heads feature a 61cc combustion chamber volume for improved efficiency and performance. The intake port is shaped in a classic cathedral design while the exhaust port has an oval shape for better ...PN: TEA-OEMLS2ST2-CUSTOM. GM Factory LS-2/LS-6 Stage 2 PortingOur most powerful CNC ported factory casting for the LS-1 Engines, the Stage 2. Designed using the same 2.04 and 1.57 valves and valve job technology developed and used in the TrickFlow 215cc head this head has awesome mid-lift airflow. It performs on par with most aftermarket heads.Description. LS1 LS2 CATHEDRAL PORT - 243 CYLINDER HEADS. Sold as a Pair - Bare. Machined - ready for assembly. Suit the 5.7ltr and 6.0ltr. These Cylinder heads are a High-Performance replacement to the GM 243 heads. All factory mounting points with the Performance of the 243 port and chamber. You can use your existing valves & springs.Exhaust flow at .600" - 180 (241) / 183 (243) The 243 heads have a D-shape exhaust port that improves flow and came with higher lift valves springs. Both heads came with 2.00" intake valves and 1.55" exhaust valves. To my understanding, this is all the difference. Last edited by R6cowboy; 02-26-2011 at 01:52 PM.#1 · Oct 25, 2012. cammed 6.0. stock 862 (5.3) heads and compression at 10.5:1 or. stock 317 (6.0) heads and compression at 9.5:1. the Capitalist Creed - From each according to …

An interesting finding is that in contrast; an LS1 head is 10-30 CFM below an LS6 head through out the range, stock and ported, except in the following instance when coupled with an LS6 manifold: Ported LS1: 166 / 211 / 229 / 244 / 257 / 269 / 277 / 283. + Port matched LS6 Intake Manifold. Note that the ported LS1 head with the LS6 manifold out ...So how do 862 heads compare against the factory heads these engines come with? The 5.3L LM7 crate engine from GM trucks feature stock 243 heads. 243 …241 vs 243 the 243 is a better head. Ported vs Ported the 243 is a better head. The AFR heads are 205CC intake runners. They do this to keep velocity up. Many porters go larger then this "225+" which can effect you TQ curve at lower RPM's. I'm using a set of 317's with 225CC intake runners that flow 310 at .6000.Last Updated on Aug 16, 2023 By Paul Lucas. There are three main differences between 241 and 243 heads. The first is the size of the combustion chamber, the 241 has a 67 cc, and the 243 has a 65 cc. The second is the port shapes. The 241's oval-shaped port has a 200 cfm intake, and the port on the 243 is D-shaped and offers better flow.Vehicle enthusiasts argue about 243 heads Vs. 799, as well as 243 heads Vs. 862 heads . However, if you desire improved horsepower with excellent power output, the 243-cylinder head is a perfect choice.Suicidal Racing. 862 are for my ls1 an will make it around 11.9-1 compression and my lq9/ls3 combo will be around 13.5-1..the extra compression going from 10.2-1 on my ls1 to the 11.9-1 should be worth 30hp,the motor has a big cam (243/251 with 23 degrees of overlap) so it really needs the extra compression.

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.ForceFed86. 2515 posts · Joined 2012. #4 · Jul 30, 2014. Sure they are. They just flow less. At .050 on the same flow bench a 243 flowed 251/176 VS a 862 at 218/163. One article I read showed a direct head swap with no other changes was worth 24ftlb. The CC in the 862 is 61cc VS the 243's 64cc I believe. So you need to factor that in as well.

The 862 heads are an excellent choice for any GM vehicle with an LM7 engine. Although the design is meant for high-performance settings, it performs well in the Avalanche, Express, Silverado, Sierra, Yukon, and other trucks or SUVs from the late 1990s to about 2007. You know if you've got an LM7 engine by looking at the eighth digit of the ...I knew the flow was the same just didn't realize gm put the 243's on the 5.3's. I better look at the driver side because I remember GTO's and vettes with 1 - 799 head and 1 - 243 head on the other side. My LS6 has 10.5:1 with 243's and I love it. The 09' has great response also eventhough I haven't tuned it yet. 97 GMC, 2002 LS6.The 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 ...241 was used on 01-04 LS1 engines. They both have a 66.67 cc combustion chamber (10.1 CR), 200cc intake runners, and 70cc (round) exhaust ports. The 243 head is the 01+ LS6/LS2 head. It has a smaller 64.45cc chamber for more compression (10.5 CR on LS6), 210cc intake runners, and 75cc D-shaped exhaust ports.GM never made an iron LS1. Look at the front of the block and it will clearly have the displacement cast into it. If it is a 5.3, slap some 243's on it and a punchy mid range cam in it and it'll be a good street brawler. If it is a 4.8, some aftermarket heads with revised valve angles and dual valvesprings (TF Gen X 205 for example) and a cam ...Sniper's Hide is a community of Snipers of all kinds, focusing on long range shooting, accuracy, and ballistics. Founded by Frank Galli in 2000, Sniper's Hide has been offering informational videos, podcasts, and other support to its users in one location. Forum Statistics. Threads. 474,737.

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link to camhttps://www.summitracing.com/parts/btc-trucknorrisLink to valve springs https://www.summitracing.com/parts/SUM-174002cam retainerhttps://www.summ...51 posts · Joined 2011. #1 · Feb 22, 2012. Are the 5.7L 243 Casting Number Cylinder heads Direct Bolt on for a 4.8/5.3? StrokerAce03;5114860 said: Basically its just a bastardization of parts to create an oversquare engine that should scream at high rpm and rev to the moon. BE DIFFERENT.Bandaging that gnarly cut before you head to the emergency room? Snap a pic first. We’ve advised you before to take photos of your children before a big outing, screenshot your boa...GM LS6 (243 casting). Information needed…Just picked up a set of 862 5.3l heads for $100 and was wondering how well they will work for me. I have a forged 346 and the pistons have a small dish. I haven't done the math but the CR is around 9.2-9.4:1. I want to bring the CR back up to around 10:1. My plans are to hog the heads out and throw in some big valves and have them milled to get ...To introduce the LC9 engine, it is a V-8 and features 799 or 243 casting heads which are closely related to the LS6. ... However, there is one key difference between them: their compression ratio and make. The 862 heads have a higher compression ratio than the 706s, owing to their sand cast construction.WNY. Dec 23, 2016. #2. I'm no expert on this but, 07 on 5.3's had the 243 heads and from what I read they are the most desirable.The 243 and 799 heads are pretty much the same, dismantlers claim that they often find one of each on the same factory truck engine. You might want to do some research into the 243.Incidentally, 799 heads are essentially identical to 243 heads, but the 243 casting has a smoother finish. 823 vs 706 heads. Similar to the 799s, the 706 will deliver better performance up to around 4000rpm. However, for racers willing to spend a little more money, the 823 LS3 cylinder heads are fantastic all-rounders. The Final Verdict863. Rectangle. 4.750" +- 0.003". 12604861. 12610716. 12675872. Share this article. We've tried to boil down the GM part numbers, casting numbers and other LS cylinder head information into an easily usable (and ideally definitive) cross reference. Note that we're not perfect and some of this data may not be perfect so use it for what you will.

GM LS6 (243 casting). Information needed…Re: LS 862 head porting. by mag2555 » Thu Jun 02, 2016 11:20 am. Take the wing out of the intake bowl and be dam sure to leave a Venturi in the Exh valve bowl below the seat cuts and if headers will be run be sure to leave the Exh port exit at the flange smaller then the inlet of the header tube , very much so on the floor, in fact do not ...GM LS6 LS2 Gen III Gen IV Cylinder Head 243 Assembly Set w/Rocker Arms OEM. Opens in a new window or tab. Remanufactured. $685.75. rollingautomotive (21,312) 98%. Buy It Now. Free shipping. ... 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% ...We may earn a commission for products purchased through links on this page rutgers add drop period 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 NumbersThe 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 ... eliminator boats for sale craigslist The Gen III have 862/706 Gen III heads, and the Gen IV have 243/799 heads. The 862/706 heads have smaller combustion chambers than the Gen IV, raising the compression ratio when swapped...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 ... vati comprehensive predictor 2019 quizlet We Step Up The Power With A 468ci Engine To Log The Performance Of Nine LS3 Rectangle-Port Heads. ... 243. 0.700 . 359 . 246. Like the offerings from Mast Motorsports, the Dr. J's CNC LS3 heads ...The 862 heads have a smaller combustion chamber size than the stock 243 heads. The chambers measure 61cc, which bumps static compression over 10:1 with a standard 3.622″ LS crankshaft. This can improve the power output and durability of the engine. navien npe 240a manual 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.862 Vs 243 Heads . One of the first things that you need to consider when building a performance engine is what heads to use. There are many different options on the market, but two of the most popular choices are 862 castings and 243 castings. So, which one is better? The 862 heads were originally designed for high performance applications. great clips ham center The reason is simple: The more you squeeze the air and fuel mixture in the combustion chamber, the more power you can create. In theory, forcing air and fuel in as small a combustion chamber as possible (measured in volume) will yield maximum engine compression and horsepower. There are a number of ways to accomplish the task.the LS6 243 heads have the hollow Intake and Sodium filled exhaust valves for higher RPM use. 7000 rpm Reply Like. 05-01-2012, 11:59 AM #4 chassed. Melting Slicks . Member Since: May 2009. Location: Rio Rancho New Mexico. Posts: 3,123 Likes: 343 Received 281 Likes on ... 24 hour fitness miami photos The 243 heads have larger intake and exhaust ports than the stock heads, allowing for an improved airflow that increases torque and horsepower. With this increased airflow comes a greater capacity to burn fuel efficiently, giving you better performance overall. Additionally, these upgraded 243 heads are designed with a higher-lift camshaft so ... jurrens funeral home in rock rapids iowa BARE GM LS 243 HEAD - 4.8L, 5.3L & 6.0L. 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. Generation III cylinder head for V8 truck, van, SUV and perfomance applications often called an LS6 …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 heads prizeloot sweepstakes Part 6 of the LS 5.3L Build will cover Installation of the 862 Aluminum Heads, Lifters, Pushrods, and Rocker Arms. Project Rowdy is a restoration on a 1979 J...If you are fan of Total Engine Airflow promote us by clicking on these buttons Tweet. Total Engine Airflow specializes in CNC-PORTED cylinder heads, custom cylinder head assemblies, and support components for GM, Ford, Mopar and many other makes for street/strip, competition, and racing applications. FEATURED PRODUCTS. best glock 17 gen 5 compensator 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 … 1525 clifton rd IMHO. The compression rise isn't worth the trouble and cost of changing heads. With smaller valves it's a step backwards. I would do cam and exhaust work with your exsisting heads. Plus the usual tuning of injectors,computer etc.. My V-Max 6.0 pings on less than 92 octane. The compression is worth everthing. mpre percentiles 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.6.0L (LQ4 and LQ9): Upgrading these larger engines with 706, 862, or 243 heads requires a single-pattern cam to optimize power gains. Cam specs play a vital role in compatibility as well. For example, a single-pattern cam with 224 duration and 112 LSA works best with mildly ported 706 heads. Comparative Table. Engine 706 Heads 862 …