I have GM MLS head gaskets with a 0.051" compressed height and am planning for 0.010" out of block for a 0.041" quench. This should net me a compression ratio of 11.16:1. ... LS3 aluminum block (4.070" bore), 3.622" stroke, 243 64cc heads, flat tops with -3.2cc valve reliefs, 0.051" GM MLS head gaskets. combo will use a 228r cam, ported 243's ...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.forthman. 654 posts · Joined 2003. #2 · Mar 16, 2006. The old 69-70 351w heads have bigger valves and intake runner. Otherwise the 302 and 351w heads are the same. E7TE castings are albout as good as they get. The 289 heads do offer smaller combustion chambers but also smaller intake runners. I ran 302 E7TE's ported and milled so they had ...Our fellow tech writer and dyno-flogger Richard Holdener reports a gain of roughly 15 hp with stock 5.3-liter heads on a 6.0-liter. Our 5.7-liter head test bumped the average power by 9 hp but ...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...

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 …(Kitco News) - Kitco aficionados, it is now time to have your say in where you think gold prices are heading in the short-term.Read more on 'Kitco' Indices Commodities Currencies S...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.

Dec 3, 2013 · 4135 posts · Joined 2010. #3 · Dec 4, 2013. I know you are on a budget, but once you clean, do a valve job and mill those 243s, you will have some cash in them. You could sell them for $400 or so, get a set of Stage 1 LS6 CNC ported heads for around $1200. I just think that is fantastic bang for the buck.

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 ...715 posts · Joined 2008. #5 · Sep 23, 2012. Holdener did some 5.3 testing with the TFS 205 heads which have 2.00"/1.55" valves and almost a 3.900" bore chamber. Versus the TFS 215's with 2.04"/1.575" valves and a 3.950" bore chamber, and the 215's made more power. The 205's made 500 hp leaning on the engine and the 215's made 510 hp fairly ...Another difference in the LS valvetrain is that they come stock with a fairly large diameter camshaft. "The reason the camshaft is larger is because the larger the diameter of the camshaft, the stiffer it will be and the more stable it will be," Clay explains. The GenI and GenII Chevy small blocks came with comparatively small journal ...317's would kill your compression, get the 243's. The 243 chambers will make more power than the 241's or 317's, even if flow and chamber volumes are the same. You are correct, the 317 has a bigger chamber than the 241 & 243, thus dropping compression ratio. That being said I have seen a few 5.7's with 317's, and worked quite well.The 243 heads produce about 5% more power on flow alone. If you were to judge the 243 heads vs. the 241s on head flow alone, you'd get a slight power edge. This benefit occurs because of the hollow valve stem, delivering a better RPM potential that stands up to more supercharger or turbo applications.

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One popular option for 383 strokers is aluminum heads. They offer several benefits, such as being lightweight. This results in reduced overall weight, which enhances performance. Additionally, aluminum dissipates heat well, allowing the engine to run cooler.

Is it worth it to get them cnc'd vs having the ls1 heads cnc'd? I thought the 2004 GTO had 243 heads My ride is a 2002 Camaro SS SLP #3296 with 30k, LTH, 3" Y, CME, Frost tune, K&N, ported TB, Blackwing lid, Bellows, MSD, Denso Iridium, and 85mm MAF, Bilsteins, Eibach springs, SLP strut brace, Adj. Panhard, TA Girdle, UMI, Pro 5.0, Nitto …Street Performance of The 706 Head. It's worth noting that the 706 heads have a larger combustion chamber than the 862 heads, which measures at around 71cc. While this might sound like a disadvantage, it can actually be helpful for engines running on lower-octane fuel or those using forced induction.These large-runner heads have a 12-degree valve angle, like stock, and are compatible with factory LS7 rocker arms and stands. The heads can accommodate 1.625-inch-diameter springs, and several are available. A 4.125-inch-or-larger bore is required. Base price is $1,130 each, fully assembled, through Summit Racing.European heads of state are meeting today in Brussels for their latest bout of dialogue on the EU crisis. European Council president Herman van Rompuy writes, “The main purpose of ...Here’s a quick data sheet on the specs of 799 heads. Due to the similarity, 243 heads should follow the same characteristics in normal situations: Combustion chamber volume: 64.45cc. Intake port volume: 210cc (sometimes seen as 209cc too) Exhaust port volume: 75cc. Intake valve diameter: 2.00 inches.

13K views 96 replies 22 participants last post by treys06GTO May 31, 2013. 420GTO Discussion starter. 1052 posts · Joined 2006. #1 · May 22, 2013 (Edited) There are a set of 243 heads available ported by AI, 232CC package including Comp dual springs, but for a lil more ($400) there are a set of AFR 205's OR Cartek 4x heads available.forthman. 654 posts · Joined 2003. #2 · Mar 16, 2006. The old 69-70 351w heads have bigger valves and intake runner. Otherwise the 302 and 351w heads are the same. E7TE castings are albout as good as they get. The 289 heads do offer smaller combustion chambers but also smaller intake runners. I ran 302 E7TE's ported and milled so they had ...Realistic Capabilities of LC9 5.3. Ill go on and say im very, very inexperienced with LS stuff. I just snagged a 08 LC9 aluminum block 5.3 for dirt cheap. It has a bad crank (spun rod bearing), 243 heads, truck manifold.The GenX 205 heads were combined with a healthy Comp cam (Grind # 277LrR HR13) that featured a .614/.624-inch lift split, a 227/243-degree duration split, and 113-degree LSA. The spring package ...I wonder if the Edelbrock head was an LS1 or a 5.3L specific head. The bore difference of the LS6 to the 5.3 liter motors is 99mm vs 96.01. 3mm diameter is only 1.5mm smaller from the wall to the valve. I know it will shorud but the test showed it worked. The engine ran on an engine dyno and ran well.

2005 GTO QSM, 418" NaturallyAspirated ,Bullet Racing cam, 243 heads, 6speed, Kooks 1-3/4" headers w/cats ,matchported FAST 102,NW 102mm, 3.73 gears PB in 1/8th 7.76@97 on Firestones with 1.97 60'. Tick Performance tuned.forthman. 654 posts · Joined 2003. #2 · Mar 16, 2006. The old 69-70 351w heads have bigger valves and intake runner. Otherwise the 302 and 351w heads are the same. E7TE castings are albout as good as they get. The 289 heads do offer smaller combustion chambers but also smaller intake runners. I ran 302 E7TE's ported and milled so they had ...

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 LS6.862 heads vs 243. The 862 casting number represents the 862 cylinder head. The 862 heads came on all LQ9 6.0 engine blocks and are completely interchangeable with the 243 cylinder head. Both the 243 and 862 heads have the same 64cc combustion chamber, but there are some very slight differences in the pore size of the two heads.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 ...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.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 ...In a comparison of the cammed 243 head and the cammed rectangle-port LS3 head, the LS3 torque peaks at 456 lb-ft (4,800 rpm) while the 243 head madeat leastthat much torque from 3,500 rpm all the ...Regarding finish, many reviews say 799s deliver a smoother one than its rival when pitching them against each other. 823 vs 243 Heads. As mentioned about the LS 823 heads specs, its bigger intake port owns a 70cc, whereas the common 243 L6 cylinder heads have basically a smaller volume at 64cc.2752 posts · Joined 2011. #1 · Jun 25, 2012. Ok, just got my 243`s today. Not my first set of head porting, but it is my first LS set. Im pretty comfortable were im at with them right now. They are at the roughed stage, waiting on my roll kit. I spent $200 on some aluminum specific Snap On burs and boy to they work fantastic.Compression Ratio Calculator - Wallace Racing. 3.622" x 4.00" / 6.098 rod length / 9.240 deck ht. / 0.008" out the hole / 0.052 gasket / -6.7 cc dish / 4.000" head gasket bore / and either 71.06cc for 317 or 64.45cc for 243's. Note if you do run 243's on the LQ4, the piston raised ring around the dish has been known to interfere with the ...

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Jun 5, 2020 · 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 ...Trick flow 228/230, K&N CAI, Beehive Springs,Hardened 7.4 length Push rods,Spintech Catback Exhaust. The rest of the car has stock manifolds,stock intake,stock cats,stock 241 heads. I pass smog and put 365 to the wheels and 352 pounds of torque. I have a simple set up and I will be installing AI 243 heads and shorty Headers with in this month.The 243 vs. The 799 Cylinder Head. As you have most likely caught on by now, these two cylinder heads are practically the same. The main difference between the 243 and 799 cylinder heads is that the 243 was used on older engines from GM Research, while the 799 has been used on newer engines from multiple manufacturers.Upgrade your LS1 or LS6 engine with our Remanufactured CNC Ported 243/799 Cylinder Heads with .650 Springs and 2.02/1.59 Valves. These high-performance heads, designed by Chevrolet, are meticulously remanufactured to exceed OEM specifications, ensuring top-notch quality. These CNC Ported LS heads, part number ALL-65056PC, fit engines …Our 706 & 862 ported heads include: Our in house CNC port. PCD surfaced to your desired chamber size. Proprietary competition valve job. Hand blended valve job. ***This is our most common setup, but if this doesn’t meet your needs please call us so we can get you set up to your needs***. Intake valve: 2.02 Exhaust: 1.57.Dec 2, 2022 · Chevy Cylinder Head LS1/LS6 243/799 - PAIR, Year:97-04. NEW CNC Ported LS1/LS6 Cylinder Heads .650 Springs 2.02/1.59 Valves PAIR. CNC Ported LS1/LS6 243/799 Cylinder Heads .650 Springs 2.02/1.59 Valves PAIR. Check out Our Other Articles: Everything You Need to Know about LS3 Heads. 823 Heads – Everything You Should Know About. All About 243 ...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.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.Jun 2, 2023 · Here’s a quick data sheet on the specs of 799 heads. Due to the similarity, 243 heads should follow the same characteristics in normal situations: Combustion chamber volume: 64.45cc. Intake port volume: 210cc (sometimes seen as 209cc too) Exhaust port volume: 75cc. Intake valve diameter: 2.00 inches.check out this video were the guys from brian tooley racing swapped on a set of stock l83 (lt-based) heads onto a gen 4 5.3l ls. check out the power gains offered by the lt heads, custom cam and l86 intake on the ls. also tested an intake upgrade, comparing the l86 intake to the btr long runner trinity! share this; 0;

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 ...So at the rate you mill 243's to 862's, you still will gain higher compression yields from 862's with less impact to manifold alignment or mis-alignment. Really the best upgrades are the LS3 heads, especially if you are buying intake, fuel rails etc. . If you do not have a 4 inch bore, LS3 is not recommended. Hope this helps on the heads.You could bore to the LS1 pistons run them and get a set of ported 243's. Add a Fast 90mm intake, cam, and you have an 400hp iron block LS6. Thats easily a 100K mile motor. For a stock 5.3L port the heads, cam, and a LS6/Fast intake and it might make 400hp on a engine dyno. But would make 300-325hp at the wheels. sapphire penn manor You know that sinking feeling you get when you say yes to too many requests, take on too much when you know yo You know that sinking feeling you get when you say yes to too many re... mira mesa power outage The guy I brought my L33 from had changed the 799 heads out for 862 to bump up the compression. Unfortunately he didn't still have the 799's. I kinda like the bump in compression but the 1.89 exhaust valve sucks. I've seen where guys have upgraded the valve to a 2.00 and with a little porting work out flowed the 243/799 heads by a fair ...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 ... mike lamfers obituary 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 ... lake geneva go karts LSX3rdGen. The 241 head is a stock ls1 head it was on the f bodys and also on the ls1 vettes. They were produced between 2000 and 2003. they are the same as the 853, the 853 was made from 1997 to 2000. ls6 heads are 243's. www.craigslist.com billings mt BEFORE Engine - 02 LS1, Stock Bottom End Heads - Stock Flowing 243's Cam - A.I. 230/238 .600/.601 113LSA Intake - LS6 w/42lb Green Tops Hedaers - Shorties jetblue b6 seating chart The 706 Vortec heads are even slightly superior to the commonly found 862 heads. The reason is that the 706 heads are SPM ... these are basically 243 heads; See All 5 Photos. Vital Specs for 706 ... james avery terrell tx The valve size is a notable difference between the 906 and 062 Vortec heads. The 906 heads have 1.94-inch intake valves and 1.50-inch exhaust valves, while the 062 heads have slightly larger 1.94-inch intake valves and 1.60-inch exhaust valves. This difference in valve size can affect the engine's overall performance, as we will discuss later ...The 243 and 706 heads are the exact same. The only difference is that on the ls6 specific 243s, the exhaust valves were sodium filled to make them ever so slightly lighter. The 243 heads and 799 heads are the same. The 706 heads are the same as the 862 heads. Yep I'm dumb. donatoes promo code 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 ... astronauts advisory group crossword 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.It still used 799/243 heads but also utilized variable valve timing and had flex-fuel capability. Chevy also used a 5.3L engine that was only in vans produced from 2010 to 2014, known as the LMF engine, identified by a number 4 in the 8th digit of the VIN. ... some include 1218 springs and the Elgin 228/230 cam. If your truck has 862/706 heads ... bank of america royal oak May want to read through here on the OEM head, just for some reference on the 243 vs. 317 heads on any short block larger than 6.0 especially if you plan to go the boasted route. Personally I would think the smaller chamber 243 head may not be the best bet if you plan a lot (say over 5-6 PSI) of boost pressure. ethan falkowitz gofundme Head gasket repairs can be expensive, but the cost can vary significantly depending on the cause of the issue and the type of repair needed. Knowing what factors impact the cost of...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.