Nov 5, 2017 · I think for the money the 706 is a better option. Here’s my thinking. The 243 has. 2.00 intake and 1.55 exhaust with a 65cc combustion chamber. The 706 has. 1.89 intake and 1.55 exhaust with a 61cc combustion chamber. If I have a set of 2.00 intake valves put in the 706 with the smaller combustion chamber wouldn’t I have a better head …7477 posts · Joined 2005. #29 · Nov 2, 2013. Stock 243 heads are good for about 20 hp on a 2004 LS1 and can often be found for about $400 or so. 2004 torrid red with red interior A4 GTO (1 of 499) TR-230/236 cam/TEA ported Trick Flow 215 heads/4" CAI/100mm MAF/ported FAST 90/Kooks/Magnaflow.But, the combustion chambers are bigger than the 5.3 heads. You need to mill the 243 heads about .020" to keep the compression ratio the same. 2004 torrid red with red interior A4 GTO (1 of 499) TR-230/236 cam/TEA ported Trick Flow 215 heads/4" CAI/100mm MAF/ported FAST 90/Kooks/Magnaflow.I picked up my car that was advertised as 6.0 heads on it and found out that it actually had 5.3 heads on it by the casting numbers. I was given a bunch of receipts for work that had been done to the car and there was one where some valves had to be replaced in one cylinder and the intake was a 2.05 that was put in when by the specs it should have …85 posts · Joined 2006. #1 · Aug 31, 2014 (Edited) I've been floating the idea of buying a high mileage 05-06 GTO for 8-9K and simply putting in a fresh 416 short block, rebuild the stock 243 heads, put in a Lingenfelter GT2-3 Camshaft (207/220 duration @ .050 lift -.571/.578 lift with 1.7 rocker 118.5 CL), new springs & lifters and then ...

The guys are disputing the model year of the car not the cast dates. Those are L78 heads or replacement L72 heads since the LS6 applications came with 1.88 EV and taper seat plugs. Nov '69 would be for the '70 model year (or over the counter service heads). The 291 casting was also used on earlier L72 427 with 1.72 EV & ring seal plugs.

Here's my thinking. The 243 has. 2.00 intake and 1.55 exhaust with a 65cc combustion chamber. The 706 has. 1.89 intake and 1.55 exhaust with a 61cc combustion chamber. If I have a set of 2.00 intake valves put in the 706 with the smaller combustion chamber wouldn't I have a better head with more compression and that's not counting if I ...dyno junkie. 1259 posts · Joined 2008. #4 · Aug 28, 2012. I repeatedly ran 12.09 with 243 heads on our LS1 with a similar converter and 3.73:1 gears with a Speed Inc Comp Cam 228 228 .588 .588 113. With a change to a twin 2 1/2" exhaust system and 4.1:1 gears I went into the 11's. Same cam with FAST 90 and a bigger converter ran as quick as ...

The 5.3/4.8 706 head was the go to choice before 243/799 castings became more available. Any chance to check with prior owner of the engine and find out the history of the heads? You might get lucky and have a good set of ported 706 heads. A correctly built and ported 706 will give any ported 241 a run for the money.Aug 24, 2022 · The 862 head is commonly utilized in high-performance cars, racing, and sports cars. It’s also found in some luxury and sports cars. The 862 is a 12-valve design that utilizes two intake valves per cylinder and one exhaust valve per cylinder. The combustion chamber volume is 84cc for the 862S, 83cc for the 862C, 84cc for the 862F, 82cc for ...Aside from the casting number, they have distinctive D-shaped exhaust ports. 243 castings are harder to come across and are sometimes called LS2 heads. On the …My 2007 came with 243 heads stock. the 862's are off the early 4.8-5.3 motors after about 99 I believe. I also believe texas speed used to have the 2.05 valve opton on those heads at one time. I run 2.04 valves on mine. 12-30-2010, 08:54 AM #7.The 243 heads, being performance-oriented and made of aluminum, tend to come with a higher price tag. Consider your budget and intended use when making a choice. Modifications and Customization. If you’re a gearhead who loves to customize and modify your engine, the 243 heads offer more room for improvement.

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So, casting 862 heads would do favors for your car with a perfect set up. Last Words. In a nutshell, the LS 862 heads are the best-performing, affordable, and ported 5.3 heads that will best suit your car. If you are looking for a high-performing cylinder head at an economical price, then the 862 LS heads are definitely a great choice.

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 ...706 heads, also known as “706 cylinder heads,” are a specific type of cylinder heads commonly used in engines produced by General Motors (GM), specifically in their LS series. These cylinder heads are quite popular among engine enthusiasts due to their compatibility and desirable features. The name “706” comes from the casting number ...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.It's a 2004 A4 LS1. Lots of good info here. I can't seem to find much on these 843 heads except they're older than what comes with my car. A friend of a friend is looking to sell them to me for $1000. He said they're used off an older corvette, cnc'd on intake exhaust and combustion chambers, new stock valves with 3 angle valve job, ls6 yellow ...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 ...

Jul 21, 2014 · Scoring a 4.8 or 5.3 with 243 factory heads tomorrow. It's out of a 2007 Tahoe. I've been told that 4.8s didn't come with 243s only the 5.3s? Can anybody verify? I'm only paying $150 for the whole thing so I'm pretty happy. Also, is there a way without the vehicle vin to identify what it is...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.After installation of the 706 heads, the power jumped to 468 hp at 6,800 rpm and 413 lb-ft of torque at 5,300 rpm. The 706 heads consistently improved the power output of the naturally aspirated 5.3L by 20 hp. Did the 5.3 come with 243 heads? Q: Did the 5.3 come with 243 heads? Of course, the 5.3, as well as the 4.8, come with factory-designed ...The LS2 heads wich is the same as the LS6 head has a casting number of 243. Problem is that some of the LS2 have heads with a casting number "799" truck heads, wrong head!!!:weird: I have checked mine and it has the 243 castings.:thumbsup: A vette owner dynoed his vette with some mods and only pulled 345!!! So far 5 07 vettes have …Parts included in build of motor are: AES 403 LS2 Block - 11:5:1 Compression. Callies Crank. Callies Rods. Diamond Pistons. Total Seal Rings. ARP Hardware Kit. AES Ported LS3 Heads (With all the top upgrades ) 241/252 6**/6** 112LSA.

I recently installed a set of blueprinted and ported 240cc 243 heads with oversized valves on my 1998 c5 corvette and wow! I cant tell which of a mod yielded more of a boost between my cam/UD pulley mod or this!! raised compression ratio to 10:9:1 with room to go for more with a different gasket, Apparantly 97-99 heads were the worst casting for the c5 corvettes ever made, im going for retune ...

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.Texas Speed has ported 5.3 heads for a reasonable price if you want more flow. If the heads are 706 castings, chances are that they are cracked. You can improve performance with 243 heads, but you will need to mill them to maintain compression. Your best bet is to just get some 862s and have some work done to them.Dec 22, 2010 · 821/823 castings. im going to order ls3 heads but i would like to know the difference between 821/823 castings,i thought i read somewhere they were cast using a different process or something to that effect ,so which is better ls3 or l92 or is there no difference besides the map sensor. IBM 04/A4, #243 heads, Mild Blower cam by Comp …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 ...Jun 11, 2020 · 64nailhead. 4523 posts · Joined 2012. #5 · Jun 13, 2020. Here's your decision - the 317's will work better if you're looking for boosted 1000+ HP, but the 243's will work better everywhere below that. Something to keep in mind, old school SBC and SBF static and dynamic compression ratios do not apply to LS heads.The 799 cylinder heads come with a 64 cc combustion chamber, whereas the 243 comes with a 65 cc combustion chamber. While the difference seems ignorable, it is a known fact that a smaller combustion chamber will create more compression and improve vehicle performance.For the sake of mass production, the production Gen III V-8 cylinder heads were designed to fit the smallest-bore Gen III V-8 engines--the 4.8L and 5.3L, 3.780-inch-diameter cylinder bore SUV and ...Jun 29, 2023 · Apart from 823 heads, you can easily come across 821, 799, 243, and 706 cylinder heads. I have tested these to summarize this rundown for you, so check it out! 821 vs 823 Heads. Basically, this couple has the same structure yet different valve and spring technology.For example, Corvette Z06 came with 243 heads featuring sodium exhaust valves – typical for the L6 engine. In all other gens, though, even the valves would be the same, made from stainless steel. Spotlight. 799 Heads (Re-manufactured) Disassembled, properly cleaned out, and fully inspected for casting integrity.

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Google can help you figure out where bitcoin's price is headed. Bitcoin’s skyrocketing price is showing no signs of slowing. It’s currently trading for over $4,100 a coin, having b...The 823 head, typically found on LS3 engines, features a combustion chamber volume of approximately 68 cubic centimeters (cc). This chamber size is part of what gives these heads their high-performance characteristics, allowing for effective compression ratios in performance applications. The 68 cc combustion chamber, in combination with the ...26791 posts · Joined 2006. #7 · Apr 13, 2010. 243's for cath ports and l92s for sqaure ports.. i would say are the best lower budget heads from what i understand that came on stock motors..a 6.0l comes with 317s which are the same as 243s just with a larger combustion chamber..if you want to use boost use them..the 243s are an ls6 head and ...Definitely to maintain low end response and torque,stick with cathedrals. LS3 heads and hears why, ls2 l92 heads makes 460rwhp 446rwtq. Over 450Hp, and a fairly broad and flat torque curve with a mid sized cam, and a set of heads that you can assemble with good springs for about $1000. Originally Posted by Rtzracer.There have been several back-to-back tests where they swap all the OEM heads around on 5.3's and 6.0's. Holdner's are probably the most "Famous". They clearly show the small valve heads (stock for stock) make the most power. (Yes, more than 243's.) All NA tests, nothing to do with forced induction.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.Jun 5, 2010 · 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.243 heads, 05/06 FRC~ Jump to Latest Follow ... Come discuss mods, horsepower, engine specs and more! Show Less . Full Forum Listing. Explore Our Forums. Appearance/Detailing LS1/LS2 Engine Tech Texas Drivetrain Wheels/Tires. Top Contributors this Month View AllYep, Bill is right. 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 ...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 ...

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.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...If the 243 head is off of a Z06 and has yellow valve springs then it will have lightweight valves which drop valve train weight. 243 heads are better in every aspect then the 241 heads but 241 heads are not junk either. They are a good head. ┌∩┐ ( _ )┌∩┐. Man: The Mods you are fighting, 05 silverado center console Thanks. 853 and 241 are basically identical. 853 was used on 99-00 LS1 engines. 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.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... beyblade rivals redeem codes Ok here is the truth, After working with 305 heads for almost 10 years. They can be good heads mostly for people who can not afford better or doing your best with what you have. Compression can be sometimes a problem but mostly this is not true. In most cases a piston is .020-.035 in the whole and a .040 or so gasket with a 58cc chambered head ... play it again sports coral springs For example, Corvette Z06 came with 243 heads featuring sodium exhaust valves – typical for the L6 engine. In all other gens, though, even the valves would be the same, made from stainless steel. Spotlight. 799 Heads (Re-manufactured) Disassembled, properly cleaned out, and fully inspected for casting integrity.Equipped with the 317 heads, the turbo 6.2L produced 807 hp at 6,800 rpm and 747 lb-ft of torque at 4,900 rpm. The boost pressure peaked at 7.6 psi, before dropping to 6.9 psi at 7,000 rpm. The ... fritz wetherbee net worth Compatible Engine Type. Anyone who is considering getting either the 799 or 243-cylinder head needs to know about their engine compatibility to make sure they …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 ... zenleaf harrisburg This program works on the following head casting numbers: 243. 799. 317. 035. Now you can get this porting service on your cylinder heads at an incredibly low cost! Simply follow this procedure: Remove the cylinder heads from your car. Disassemble cylinder heads to completely bare condition. sara carter husband martin bailey The 243 heads from GM are third-generation cylinder heads designed for performance applications, V8 trucks, SUVs, and vans. They are frequently known as LS6 …Sep 6, 2023 · Also, the finishing is good as it is PCD milled to make sure it is very smooth. Also, all the heads have a new valve stem and can be replaced with new ones to ensure high-quality performance. All the 799 heads have a 3-year unlimited warranty. However, it is essential to ensure installation is done as per the manufacturer’s instructions. eden north carolina news 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.Find Parts and Accessories 243 heads KEYWORD and get Free Shipping on Orders Over $109 at Summit Racing! Use your Summit Racing SpeedCard today, and get up to 10% back - Get Details! ... Cylinder Heads, Remanufactured, Assembled, Aluminum, Natural, Buick, Cadillac, Chevy, GMC, Hummer, Isuzu, Pontiac, Saab, Workhorse, V8, Each. Part Number: VRE ...Aside from the casting number, they have distinctive D-shaped exhaust ports. 243 castings are harder to come across and are sometimes called LS2 heads. On the truck side, these would be 035 or 317 ... mcallistertv rumble Just a rule of thumb, Most your 70's 454's will come with either the 781's or 049's unless it's a early rectangle port motor. Once you get to 1980 you start seeing way more of the 454's with peanut port heads. I won't list actual years, this is just a rule of thumb when I am looking to get a 454 core motor. 1968 Chevelle Sb. craftsman 315 table saw parts Feb 20, 2010 · A_VAS. 4684 posts · Joined 2007. #5 · Feb 20, 2010. as long as you can buy the 317's at least $150 less than a set of 243's, then I'd say do it. Reason I throw out that number, is milling them to equal the compression you figure on $120 to $150 at the machine shop. GTO parts hoarder.The chamber size is identicle as per the net static compression for a 6.2 liter. All the L92's -all castings-are made for the L92 block from the escalade which is 4.065 inches and is the same block in the 08 corvette. I wouldnt be surprised if the difference is the valve job for use with the hollow stem valves on the LS3. 73 87 chevy dually bed for sale Jun 12, 2023 · 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 ... elladur 4850 The LQ9 is a 6.0L Gen. 3 small block engine used in GM trucks between 2002 and 2007. For marketing purposes, it was also known as the Vortec HO 6000 or VortecMAX. The information listed here is for the stock engine. Mechanically similar, General Motors’ LS and LS-based Vortec engines wound up on almost every branch of …Apr 26, 2018 · If you’re gonna do a L33 swap into anything you may may as well leave the 799/243 heads that come one it. Yes I have seen L33s with a 799 on one side and a ls6’s 243 casting on the other from the factory. There is no reason to put the weaker 862 head on an L33 when the engine comes with the best flowing cathedral port heads GM made.