853 vs 799 heads 40” tall. 525 instead of. Bigger cams work in the higher rpm range where you're intake and heads do not. 45 Nov 19, 2018 · 853 heads were pre 2001, so you also have a LS1 intake unless you've changed that? Both the intake and heads are limiting factors. The LS3 lightweight, hollow stem intake valves are the same size and will fit right in. 0ivo range. Everybody seems to have figured out that these are great-flowing junkyard heads, and we saw prices around $700 for a set. Most heads are swappable but some will reduce power. Just like the Stage 1, the 243 or 799 casting receives full CNC porting of the runners and hand blending of the port and valve job. 241 was used on 01-04 LS1 engines. 15 cc The 799 heads should be 64. Jul 16, 2007 · 853 and 241 are basically identical. Key Differences Between 243 and Inasmuch as porting to 799 heads comes with an advantage of increased horsepower due to increased compression, you must ensure to consider both the pros and cons before swapping the cylinder heads. Jan 5, 2023 · Cylinder heads are an important part of any engine and can make a big difference in the performance of your vehicle. 7 - 66. Vad är 243 huvuden? De 243 huvuden från GM är tredje generationens cylinderhuvud som är designade för prestationsapplikationer, V8-lastbilar, SUV: er och skåpbilar. Since I don't have funds for a tune nor a cam and this is a heads only install. Previously, we compared the stock 706/862 heads to the 799/243 heads on a cammed 5. 0L produced 513 hp and 483 lb. Installation of the ported heads from Brodix and LPE pushed the peak numbers near 800 hp, with gains as high as 31 hp. 200 147 111 Oct 13, 2010 · The 799 heads will need to be milled a bit to get the compression ratio back to where it needs to be. 4. The 317 and 243 have the same ports but a larger chamber. 3 came with 862's, and my chambers are 61 cc. 241 '01-'03 (updated LS1) aluminum center bolt 5. The LS3, LS7 and L92 heads feature rectangular intake ports measured at 1. GM never made an iron LS1. Mar 18, 2022 · Cylinder heads are designed to control the air-fuel mixture that enters the engine. this isnt a exact number for ivo because different lobes an spring pressure also come into play. 243 and 799 heads are the same head, just some slight differences - valve stems (hallow vs solid) and where they were cast. There was much uproar among 799/243 head enthusiasts. 7 241 01-03 aluminum 5. As mentioned earlier, LS3 heads 823 have two key types of port style. Dec 24, 2017 · In terms of cylinder heads, we included the 706 small-valve 5. 55 valves in the 853 it will be cheaper to do the 853's because you already have the valves. 3L heads, the 241 (LS1), 317 (6. 243 vs 799 Cylinder Heads. We ran the 706/862 Milling a stock 5. Starting with the 706 heads, the cammed 6. My 5. comLink to head dyno test article. 67 cc combustion chamber (10. The choice depends on your vehicle’s specific needs and your driving style. 550" Stainless High Performance LS Exhaust Valves - Set of 8 for Cathedral Port 243 799 706 862 317 241 853 806 Heads LS1 LS2 LS6 LQ4 LQ9 LC9 LMG LM7: Exhaust Valves - Amazon. so the question i have is this, & if GM 243, 799, & 317 LS2/LS6 Options: Performance Rebuild Package Our Performance Rebuild option includes our high end CNC'd valve jobs, precision valve grinding, milling to any chamber volume, cleaning, inspection, and professional assembly. 3L HEADS vs 241, 799/243 vs 317s. Cylinder heads play a crucial role in the engine’s performance, as they control the flow of air and fuel into the combustion chamber and the expulsion of exhaust gases. May 19, 2010 · Makes one wonder, and the idea of a aftermarket ported or polished heads more important, The two different 243 heads, one with the triangle sand cast mark and the 243 head without the triangle sand cast mark were 5-7 hp and lb ft difference. Michigan Motorsports' stainless valves are a great upgrade for your factory LS cylinder heads. 350” wide by 2. The idea was to flow and measure Jul 24, 2024 · The 4. 550” tall, while the intake ports on the LS7 head are 1. -ft. The cylinder head is mounted on top of the engine block and usually contains valves, spark plugs, and fuel injectors. CNC ported right from the factory, the LS7 heads offered 773 hp on this RHS-block stroker. They were cast differently then the later heads but still have the same port and chamber volume as any other LS1 head. You can watch us pull Jun 18, 2022 · C5 Tech - stock 243 heads vs 853 - Has anyone swapped stock 243 heads and gained 20-30hp? I spoke with a head porter or machinest yesterday and he told me i wouldnt gain 20-30hp simply by swapping on stock 243 heads and swayed me the other way. We also discovered a horrible thing: The stock 853-code heads, which are regarded as some of the worst flowing to ever top an LS-based engine. 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. This seems slightly ropey in terms of performance. com/groups/887277178144274Link to my website, www. Aug 25, 2011 · C5 General - 243 & 799 Heads - ok so i have been reading multiple threads & posts about 243 & 799 heads. 400 Bore Spacing (same as the original SBC) Deep Skirt Block with Six Bolt Cross Bolted Main Bearing Caps (reminiscent of the old Ford side oilers, FE, and some early hemi blocks) Jun 22, 2021 · Much like the LS3 head test run on the 468 stroker, this LS7 head test on the larger 495 stroker showed just how well the stock heads work. If you find a 243 head then you are in business they are the ls6 head. Sep 28, 2015 · The Gen III LS Engine vs Gen IV LS Engine Despite numerous differences the Gen III LS Engine and Gen IV LS Engine cylinder blocks share a lot of the same traits. On the contrary, some cylinder heads boost the engine's performance due to their unique architecture Posted 10/6/2010 19:03 (#1386064 - in reply to #1385915) Subject: RE: Row crop heads revisited - 853 vs 853A Beresford SD Row belt chains tensioned with spring tensioning and chains with belts and the sprockets are heavier. If the 853 you have now are ported then you may have something. 67cc 799 '05-up 4. While 243 heads excel in high-speed applications, 799 heads offer better fuel economy and efficiency. 799 Heads Vs 862 Heads: Side By Side Comparison 799 Heads and 862 Heads are different cylinder head options for LS engines. RE: Row crop heads revisited - 853 vs 853A - Ron (Cen. the 853 heads are stock from 98-00, then they had the 241 head which was pretty much the same head. Michigan Motorsports' standard replacement valves are an affordable option to freshen up your stock or mild performance LS engine. 8L-5. They both have a 66. The 799 cylinder I have a few different sets of ls heads! All are complete!! Prices vary ! Message for info Jan 16, 2020 · also like skunk said they have less ptv vs a cath port. thedrivewayengineer. The 243 head is the 01+ LS6/LS2 head. 7/6L's. Oct 17, 2011 · 799 is a 5. Typical gains are 10-20rwhp. I would imagine the 799's are the same, if not they should be close to that. com FREE DELIVERY possible on eligible purchases Oct 6, 2010 · Posted 10/6/2010 22:40 (#1386473 - in reply to #1385915) Subject: RE: Row crop heads revisited - 853 vs 853A Iowa My 853A has dial a matic header control and the 853 did not. We’ll run through each iteration below, providing chamber and valve sizing, and their pros and cons to help you decide what are the best LS heads for your build. 67cc. Compatible with Casting Numbers 243 799 317 241 853 806. Katech had told me stock 243s flowed 260cfm vs the 853 230cfm and ported Oct 11, 2010 · 241s and 853 heads are the same. BTW `97-98 heads = 806 `99-00 heads = 853 * `01-02 heads = 241 Oct 7, 2021 · what stock ls head makes the most power? which cam should i run in my 6. 241 cast heads were Die Cast which is a process that smooths up the ports a bit compared to the Sand Cast procedure that was done on the 806 and 853 heads. 3 L33 LS engine. Same Info applies to the: 4. 8 LS could be had with one of three cylinder heads: 706 heads, 862 heads, or 799 heads. It is important to understand the differences between 243 and 799 cylinder heads, as they are two of the most popular cylinder head options for a Chevy. Also 2001 243 z06 heads have blue springs which had less lift capability, . 050 less valve drop on the intake thats why youll see a ly6 (ieon block l92)cam combo around 7. I am tapped out financially because I went with better springs and upgraded push rods, this way I only have the cam to deal with at a later date , probably a year or so later. The 799 cylinder head is better for cars because it is more efficient than the 243 cylinder head. 0L truck), and 799 (as a stand-in for the hallowed 243) heads. Feb 13, 2020 · Most people tend to grab up 317 heads because they have the same improved ports as the more expensive 243 and 799 heads. Some won't fit as some heads are designed for a wide bore. Fortunately, they have a budget alternative: heads with a 799 casting mark are more or less identical, but all came equipped with normal solid valves and normal valve Feb 5, 2018 · When we tore down our $400 LS1, we discovered some positive things and some negative things. . ): 10/6/2010 12:43; Re: Row crop heads revisited - 853 vs 853A - plowboy: 10/6/2010 13:19; RE: Row crop heads revisited - 853 vs 853A - Curt Keiser: 10/6/2010 19:03; RE: Row crop heads revisited - 853 vs 853A - dvswia: 10 Posted 10/6/2010 13:19 (#1385949 - in reply to #1385915) Subject: Re: Row crop heads revisited - 853 vs 853A Brazilton KS Bents and chains and tensioners and tin are all different. 100 . Would you have this assurance with the MTI springed heads. Feb 3, 2018 · From my research, the main difference between the heads other than roughly 50 pounds in weight, is the combustion chambers of the cast heads are 71. 0l upgrades! are the 706/862 head Dec 5, 2018 · VS Racing 80mm w/billit wheel made 853 at the tire on 20 pounds and 19* timing with plenty left in it good rods/pistons (10. 570 the yellow springs came out in 02 because Mar 13, 2018 · We find out which factory LS head works best under boost in this back-to-back test of the 706 heads vs. Do whatever is less $$$. However, they do have the LS6 springs. These heads are almost the same, but the L99 heads used a solid stem intake valve. with the installation of the 799 heads. Jul 16, 2007 · 853 and 241 are basically identical. 5-8ivo vs a cath youll see cams in the 11. htt Jun 19, 2012 · The 243 heads had better flow and have smaller combustion chambers (64. There’s nothing wrong with them, car ran great before pulling them 243 241 317 799 Jan 14, 2025 · This article will explain all you need to know about the 799 heads. 8L/5. Jan 14, 2025 · This article will explain all you need to know about the 799 heads. Has any one flow bench tested the stock 799 heads and the 243 heads ( triangle marked) ? Jul 24, 2024 · Note that there is a 5. the 317 heads. 706, they offer more advantages compared to 706 heads, irrespective of the common challenge with 799 heads. Than 1998 Trans Am WS6 - Phantom 421 CI LQ9, Tick Performance Custom Cam, TFS 255cc LS3 heads, Kooks 2" LT headers, Kooks 3" True Duals w/ high flow cats, FTP 104 lid, Speed Density Tune, 4" silicon tube, LS6 VCT, FAST 102 Intake, NW 102 TB, Oil Catch Can, SLP Bilstein Shocks w/ Vogtland Springs, CTS-V 4-piston Calipers w/C6 Z06 rotors, Stainless Steel Brake Lines, R1 concepts premium rotors, Hawk 853 97-00 aluminum 5. HOW TO BOLT ON 73 HP TO YOUR LS! DO PORTED HEADS ADD POWER? SHOULD I USE PORTED STOCK LS HEADS OR AFTER MARKET LS HEADS? SHOULD I UPGRADE MY LS HEADS? HOW MU Dec 5, 2017 · There was one issue, though: 243 heads are expensive. The 243 and the 799 cylinder heads are practically the same. of torque, which jumped to 525 hp and 485 lb. All other heads feature as-cast, rough finished chambers and ports. 3L test motor. But don't worry, most LS heads are so good Sep 1, 2017 · 853 '99-'00 (LS1) aluminum center bolt 5. 67cc) If you throw on a thinner head gasket too (MLS, about . Stock CNC'd LS6 heads I E. Aug 24, 2015 · It discusses compatibility and the interchangeability of these heads across various GM engines, including LS1 and LS6, and explains differences in materials, combustion chamber volumes, and upgrades for enhanced performance. Take pics of the intake ports and post them up. 06 cc while the aluminum 853's have 66. The type of cylinder mounted on an engine plays a significant role in determining its performance. Fits 1997-2013 Cathedral Port LS Heads EXCEPT 706 and 862 Castings. If it is a 4. LS 799-huvuden avancerad arkitektur och katedralformad avgassäng som gjorde det möjligt för dem att tillhandahålla anmärkningsvärd lastbilsmotorprestanda. Add better springs and you’re ready to go. Choose Quantity for a Single Valve or Set of 8 Exhaust Valves. facebook. 250” wide by 2. 243 and 799 cylinder heads, part of the LS engine family, differ in performance, fuel efficiency, and cost. Therefore, I would focus on a smaller cam (upper 2teens to lower/mid 220s) if you're staying with that intake and heads. Only 02-04 243 heads that came off of an ls6 z06 or cts-v have the lightweight valves. Aug 12, 2012 · Between the iron and aluminum 317 head you would see the same compression ratio. 45cc vs. On the contrary, some cylinder heads boost the engine's performance due to their unique architecture Jan 21, 2022 · These heads can be CNC-ported to improve on flow and milled for higher compression. But the 317 heads have much larger combustion chambers (71. 25:1) w/799 heads, and John Bewely's Jul 8, 2009 · The LS2 heads (243 or 799 casting) have the "heavy" standard LS1 valves. WHICH HEADMAKES MORE? We compared the four most popular stock LS heads in a back to back shootout. This week I'm getting 799 ported head GM CBM heads installed (same as 243 ported heads). Row crop heads revisited - 853 vs 853A - bgunzy: 10/6/2010 11:30. 3L Truck 862 and 706 Head castings Aug 31, 2020 · You should look for 317 or 243/799 heads with the emphasis on the later for NA builds, if going boost then the 853's. 2:1 ratio now. Browse LS Cylinder Head Services Products Sort Best Match Lowest Price Highest Price Best Rating Most Reviews List A-Z List Z-A Newest Oldest View 12 24 48 60 96 Inasmuch as porting to 799 heads comes with an advantage of increased horsepower due to increased compression, you must ensure to consider both the pros and cons before swapping the cylinder heads. Only the true LS6 engine heads have stainless steel (not titanium) hollow stem valves (the exhaust stems are sodium filled). The stock GM springs are guaranteed for three years, or 36,000 miles but generally last the life of the engine. The 5. Also any ported head including the 806's is still better then stock. 01 243's and any other 243's that came off an ls2 or other engine have regular valves so they are the exact same as 799's. I was hoping the Dec 1, 2019 · 706 5. 040) you'll be able to bump the compression up even more. The LS7 cylinder heads feature CNC-machined combustion chambers, intake and exhaust ports. Sep 27, 2024 · Michigan Motorsports 2. In comparison, 799 cylinder heads are equipped with a common shape of cathedral style at only one point at each end. I mean, the 243 (or later 799) is the go-to head for any application, but Feb 26, 2007 · Another thing to consider is the life span of the MTI springs. but it gives you Row crop heads revisited - 853 vs 853A - bgunzy: 10/6/2010 11:30. 030 puts your chamber at ~ 62. 0l? what is the best stock 6. Link to our Facebook Group, https://www. The stock heads should be something like 61. Once ported any "advantage" the 241 cast had is moot. ls3 being all alum can go . i read they are from the same casting just different numbers. Jul 1, 2018 · This time on SPPTV we continue our How to build a LS Engine series, and get back to work on the Sh!thorse's junkyard 5. However, some cylinder heads are built to minimize the engine's horsepower. Corvette LS1 engine had under 20k on its rebuild. 000" Stock Replacement LS Intake Valves Fits 1997-2013 Cathedral Port LS Heads EXCEPT 706 and 862 Castings Compatible with Casting Numbers 243 799 317 241 853 806 Choose Single or Set of 8 Intake Valves Michigan Motorsports' standard replacement valves are an affordable option to freshen up your stock or mild performance LS engine. And if there are any flow differences in stock form you would never feel it. 06cc), which Jun 29, 2023 · 823 vs 799 Heads. Thus, if you are pursuing speed, sticking with the 823-cylinder head is a wise move. If you are going to run the stock 2. If you’re contemplating 799 heads vs. May 10, 2024 · Buy Michigan Motorsports 1. 0l cam to use? stock 6. Feb 18, 2024 · Also known as 799 heads, 243 heads are the best performing aluminum cylinder heads that were standard on 3rd generation GM LS6 & LS2 engines that were produced starting in 2004 & 2005, though they are most well-known for being the cylinder heads for the C5 Corvettes. IL. 3L truck heads (these are basically 243 heads) See All 19 Sep 27, 2024 · Michigan Motorsports 2. 3 LS could be had with one of four cylinder heads: 706 heads, 862 heads, 799 heads, or 243 heads. Below are some GM numbers for 243 heads as a comparison. Sep 24, 2015 · The biggest difference between the Stage 1 and the Stage 2 is the use of larger Ferrea valves and accompanying valve job, which was developed on the Trick Flow Specialties (TFS) 215-cc head. These were pulled to build the block and put on 243s. i also read that the only difference is that the 243's have hollow intake valves & sodium filled exhaust valves. You can get a pair of stock 243/799 heads for around $500. about . 66. They are a crucial component of the engine and one of its most expensive parts. these motors do well at 11:1, they will run on 91 just fine and get you some real power gains compared to your stock 10. 5 more do to the extra growth of the block. 3 liter head. 3 used in FWD car applications, the LS4, that should be avoided due to the differences in being used for FWD. 226cc Full CNC Porting Package The go-to head for 450-500rwhp 5. The only factory head that is better than the 317 is a 243/799. That will determin what pushrod to go with. 853 was used on 99-00 LS1 engines. Choose Single or Set of 8 Intake Valves. Fits Casting Numbers 243 799 706 862 317 241 853 806. 67 cc combustion chambers. 00/1. 7 I wanted to be able to ask for photos of the casting number to verify it is a 243 or 799 head. If you put a 853 or 241 you will gain a little compression but loose flow which in turn loose power. Mar 6, 2025 · The graph illustrates what happens when we compared the 706 heads to 799 heads to 832 (rectangle port) heads to Trick Flow GenX 225 heads, then added a FAST intake to the TFS heads. Oct 7, 2021 · what stock ls head makes the most power? which cam should i run in my 6. if you are looking for a set of 243s let me know i have a set sitting iin my garage, im looking to go with a high performance head. 1 CR), 200cc intake runners, and 70cc (round) exhaust ports. Click to expand Fits 1997-2013 Cathedral Port LS Heads. 7 head . arent as good as the 799 and 243s. The quality of the port work and valve job will make more difference than which head you choose. 8, some aftermarket heads with revised valve angles and dual val Jul 16, 2007 · 853 and 241 are basically identical.
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