2002 Camaro Z/28 Pewter. Originally Posted by 98TransAmWs-6. Here are the differences: 243 heads came with 2.00 hollow stem intake valves (lighter) and 799 heads came with regular solid 2.00 intake valves. 243 came with sodiom filled stem 1.55 exhaust valves (lighter and more heat dissepation) and 799 came with regular solid stem 1.55.799 Vs 243 Heads: Main Feature Comparison. Though the 799 and 243 cylinder heads are similar in many ways, you can see from the table above that there are slight differences as well. But does it mean they perform differently? Well, the only way to find that is to compare the important features first. In the following part, I have compared some ...799 heads do not have the issue like the castech heads. 243 heads first appeared in 2001 on the LS6 Engine. First appeared in the Silverado in 2005 on the L33 5.3, and continued up until 2013. 2007.5-2013 SIlverado's with the 4.8/5.3 all used 243/799 heads. 799 heads first appeared in 2005 on the 4.8/5.3 Engine and continued til 2013.The 243 LS6 heads have a larger intake port, too. If all the 241/243/799 castings use the same size valves, the extra flow has to come from something different. I believe the 243/799 heads also have a straighter, better flow path than 241s do.I was thinking more along the lines of a ported 243 casting with a fast 90 (i figure at least $3300 for the whole kit and kabootle) figuring 2K (lets use livernois stage 3R's for pricing purposes) for the heads and 1300 for a ported fast. I havnt seen many guys go with a setup quite like this so im not sure what the powerband will look like ...799 Vs 243 Heads: Specification Comparison Table. Features. 799 Head. 243 Head. Casting: ... The 799 cylinder heads come with a 64 cc combustion chamber, ... difference, 243 head offers a more balanced ride as its smooth finish ensures better airflow. On the other hand, 799 head did ensure a powerful ride with a maximum of 25 HP.2 days ago · The L33 engine with VIN code “B” is also called the Vortec 5300 HO. The GM L33 features V8 90° aluminum cylinder block with a five-bearings crankshaft, two aluminum heads, a single one-piece cast camshaft, and two valves per cylinder (16 in total). The L33 has a sequential multi-port fuel injection system and a 78.0 mm electronic throttle ...Jul 28, 2010 · 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.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 headsWe would like to show you a description here but the site won’t allow us.Identical heads would be the 799s. They don't have the cult following of the 243s, so they're often found cheaper but they're the same head, just cast at a different plant. The only difference in the "regular" 243 from the LS6 243 is that the LS6 version had lightweight valves and special springs.Mar 9, 2021 · I have a 2004 vz ss ls1 6sp man, the engine has the 241 heads on it and I was wondering if the 243 heads would fit, if so what do I need and is it worth the upgrade. Car is currently making 253.5 RWKW what kind of gains would I be looking at. From memory yes they will fit but gains are not too much.Im selling a set of 243 heads off my 05 GTO. they have about 20K miles on it, and about 5K on the springs. they have a dual spring kit (i cant remember the name of the maker), but they have ti retainers, new locks, seats and seals. SOLDThe 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 ...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.What did LS 243 heads come on? Sometimes referred to as the cathedral port design , the 243 heads were developed by GM engineers in 2001 and featured prominently on LS6 engines until 2006. Initially made for C5 Corvette models, these powerful heads soon found their way into other engines including the truck-spec LQ9 and LQ4 versions both of ...This listing is for a rebuilt GM 5.3 liter V-8 cylinder head. These heads come on GMC and Chevrolet trucks and SUV's. For other models see our store listings. This head is completely rebuilt. It has been pressure checked for cracks and resurfaced. Guides and seats have been replaced as needed. New VITON valve stem seals have been installed. All heads are given a valve job. All valves have been ...For instance, the 799 cylinder heads come with a smaller combustion chamber than its counterparts. So porting to 799 LS heads would mean milling the cylinder heads to cover up for the bigger size of the former combustion chamber. ... Chevy Cylinder Head LS1/LS6 243/799 - PAIR, Year:97-04. NEW CNC Ported LS1/LS6 Cylinder Heads .650 Springs 2.02 ...Originally Posted by silverz28camaro. the 853 heads are stock from 98-00, then they had the 241 head which was pretty much the same head. If you find a 243 head then you are in business they are the ls6 head. If the 853 you have now are ported then you may have something. Take pics of the intake ports and post them up.This is pasted from his thread "43s ported by Ed Curtis. 64cc combustion chamber. Heads have about 12k on them since ported and about 30k total miles. CHE Ti retainers and Lunati dual springs. Springs are fairly new with less than 2k miles. Heads have new valve seals as well and were just cleaned.Chevrolet LS rectangle port heads need at least 4.00 bore. 5.3 and 4.8 are 3.78". LS7 heads require even larger. All 4.8s, 5.3s, and 5.7s came with cathedral port heads. Like mentioned, the square port heads were not put on any engine with a bore smaller than 4”.We would like to show you a description here but the site won’t allow us.by Raodlife. 862 head is an option for the 4.6L and 5.4L Modular V-8 engines. This head is a great upgrade and a bolt-on option to increase power. The 862 heads flow well and come with upgraded valves, springs, and cams, making this a great upgrade package. The 862-cylinder head is one of the heads that you can pop in with …Since then, the lampshade on the head has come to symbolize the obnoxious drunk trying to be funny—and failing. In 1938, a columnist described alcoholic actor John Barrymore as "at any moment ...So I have been playing around with some 243 heads, ported them to 225 cc on the intake port left the intake with a carbide finish and ported the exhaust to 83 cc stock the heads are 215cc/75cc. I just did a standard clean up bowl porting remove the rocker boss trim down around the guide valves are 2.02/1.57 cheapo stainless valves I was …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, 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.Trucks with 243 had heavier valves. I heard people trying to claim they have zo6 heads but come off a truck. ... 2005 Pontiac GTO,NaturallyAspirated 418", 243 heads,stock water pump,3.73 gears, NW 102mm TB,matchported FAST 102,DuSpeed OTR, Bullet Racing 242*/249* .650"/.650"cam, Tick Performance tunedJoin Date. Nov 2008. Location. Spring, TX. Posts. 2,228. 243 heads are the same as 799 heads which are found on the LS2's, same block as LQ9. you will need to match your valvetrain to your cam. i dont foresee any ptv clearance issues but you need to make sure you have the right valvetrain. Skeet is running a similar duration cam with his 243's ...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.Sep 24, 2015 · The base heads come with factory valvesprings, with three different upgrade options. All Stage 1 heads have factory valves and are milled and assembled according to owner specifications. Only new “317” cores are used for the larger chambered 6.0-liter casting, and “243” or “799” cores are used for the LS6.What did LS 243 heads come on? For nearly six years, the LS6 engine was equipped with 243 heads as standard. This configuration was designed to power the C5 Corvette s, however its popularity soon saw it being implemented in other vehicles such as LQ4 and LQ9 trucks and even Camaros and Pontiac GTOs.With a massive online catalog, you can easily view our inventory of Chevy 350 cylinder heads. The knowledgeable staff at CCH would also be happy to help you choose the cylinder head that is right for your needs. Contact Clearwater Cylinder Head Inc. toll-free at 1-800-572-1963.Which LS engines have 243 heads? The LS6 engines from 2001-2006 have 243 heads. The LS motor with 243 heads is more powerful and efficient. GM’s 243 heads were typically found in C5 Corvette and later on engines like truck specs LQ4 and LQ9. How much Horsepower (HP) is added by 243 heads? … See moreThe LH6 engine is a 5.3L Gen. IV aluminum engine that replaced the LM4 in 2005. It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). The LH6 was available in mid-size SUVs until 2009, and in GM pickups from 2007-09. For marketing purposes, it was also known as the Vortec 5300.The helicopter that crashed in Iran on Sunday, killing the country's president and foreign minister in mountain fog, was a Bell 212 model, Iranian state media reported.Gas prices have fallen below $3 a gallon in nearly half of the US as demand slows heading into the Christmas holiday season. The average price for a gallon of gas has dropped below...Sep 1, 2017 · The LS6 also received better (243 castings) heads, a slightly more aggressive cam, and a much improved intake manifold. The LS6 cam is the most aggressive cam GM put out for cathedral port headed ...The cylinder heads are designed with aluminum materials with a 61cc combustion chamber volume. They also come with a cathedral-shaped intake port and an oval exhaust port. The 826 cylinder heads on LM7 have an intake runner volume of 200cc, exhaust runner volume of 70cc, 1.890 in. intake valve diameter, and 1.550 in. exhaust valve diameter.799 '05-up 4.8L-5.3L truck heads (these are basically 243 heads) See All 19 Photos L92 heads (often referred to as LS3 heads) moved to a rectangular port and are some of the best LS heads ever ...The 243/799 cylinder heads come with a 2.00" intake valve, 210cc intake runner, a 1.55" exhaust valve, 75cc exhaust runner, and it has a 64.5cc combustion chamber. The …No modifications to do a head swap, but if both are stock untouched heads the 241s have a 66cc chamber versus the 243s 64.5cc chamber. A slight bump in compression, but it shouldn't be an issue. I believe after 07, all 5.3 engines have 243 heads. Now that you're swapping heads, you should consider getting them ported beforehand. KerryBrightwood, Virginia. The '906' heads were the standard head casting for all RB and B engines from 68-72 (ish). They are good heads and were used on everything from 383 2-bbl engines up to and including the 440-6bbl engines. No difference in the heads. The cam, crank, pistons, etc are what made the differences.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 ...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...The P heads have one more vertical bar. Also, the gt40p heads are simply the best flowing heads that ford ever produced for the small block Windsor motor. 1998 5.0, fitech efi, holley in tank returnless pump. 4R70W transmission with USShift quick 2 controller. 3.00:1 8" open rear end.Hey all, I'm planning on doing a ported fast92 and getting my stock heads worked for optimum power and bang for the buck. With that said, I really don't... in this thread in this sub-forum in the entire site. Advanced Search Cancel ... Who should work on my 243 heads? 1338 Views 13 Replies 12 Participants Last post by TheGoatHooker, Aug 20 ...What did LS 243 heads come on? Sometimes referred to as the cathedral port design , the 243 heads were developed by GM engineers in 2001 and featured prominently on LS6 engines until 2006. Initially made for C5 Corvette models, these powerful heads soon found their way into other engines including the truck-spec LQ9 and LQ4 versions both of ...78 posts · Joined 2009. #11 · Jul 19, 2010. The 2 popular heads are 243 &799 heads for the ls1.Either head will add about10- 20hp to the wheels. mods=stock 243s,85mm typhoon intake&tb,pacesetters&catless mids,85mm ls2 maf,svede otr,predator 224/231 cam,42# inj. and aComplete Street Performance dyno tune= 415/386.Better casting and flow. The kind of flow generated by the spring valves makes a big difference in how the vehicle is going to perform. With the 243 heads, you can rest assured that your car will have a good flow great stability. The casting produced by the 243 heads is different from the others which is much better when compared to other …Good deal guys. but two different casting facilities. 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. Has any one flow bench tested the stock 799 heads ...The 243 heads made about 20 RWTQ everywhere compared to the 317 heads, the chamber in the LS6 head is far superior to the 6.0 chamber. Bear in mind ECS had these same Stg 3 make over 600 RWHP on a N/A, hyd roller cam, pump gas engine that same year. ... Come join the discussion about racing, builds, pro mods, hot rods, events, turbos, nitrous ...Brightwood, Virginia. The '906' heads were the standard head casting for all RB and B engines from 68-72 (ish). They are good heads and were used on everything from 383 2-bbl engines up to and including the 440-6bbl engines. No difference in the heads. The cam, crank, pistons, etc are what made the differences.78 posts · Joined 2009. #11 · Jul 19, 2010. The 2 popular heads are 243 &799 heads for the ls1.Either head will add about10- 20hp to the wheels. mods=stock 243s,85mm typhoon intake&tb,pacesetters&catless mids,85mm ls2 maf,svede otr,predator 224/231 cam,42# inj. and aComplete Street Performance dyno tune= 415/386.It includes a new ported/blueprinted LS6 oil pump, LS7 lifters, lifter buckets, LS2 timing chain, and GM MLS head gaskets. I will order the pushrods once I measure for the correct length. Already purchased a 25% underdrive pulley. ARP heads bolts, header bolts, and balancer bolt. The LG headers already come with GM exhaust gaskets11. May 6, 2012. #4. Re: .243 case head separation. "I always just bump the shoulder back." IME, no bottleneck cartridge is any more likely to stretch enough to cause a head seperation than any other. Agree with Wade, you're likely 'just bumped the shoulder back' too far; that's the primary cause of head seperations. T.24227 posts · Joined 2006. #4 · Nov 4, 2009. I saw a post somewhere that showed that the stock 243's flow very well. I'd have them cleaned up by a pro. Save the aftermarket heads for use with a big cam and high rpm use. You will see gains with the aftermarket, but the $$$$ might not be worth the hp gain.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...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.243's are capable of great hp and tq...485rwhp/431rwtq is pretty good..he's got a cam according to video if im not mistaken... ive seen results of AI's 243 cylinder heads on stock cube/cammed LS2's make close to that...as far as hand porting goes if someone has got tons of experience doing it they ARE able to run with CNC'd heads...all you had was handporting in the old daysThe intake ports on 862 heads flow slightly less than the stock 243 heads that come on most 5.3L LM7 engines from the factory. However, the 862 heads have a smaller chamber size, which raises the static compression ratio by approximately 0.5 point on otherwise stock 5.3L engines. This can improve the power output and durability of the engine.243 Heads/Cam Dyno. 8642 Views 94 Replies 20 Participants Last post by Perdieu, Jul 5, 2006 Jump to Latest Baaa ...LaTechGTO Discussion starter. 5766 posts · Joined 2007. #1 · Nov 30, 2009. I will try and keep this as short as possible... I bought these 243 LS6 heads from a guy on tech that took them off a low mileage C5 ZO6 corvette. I had them drop shipped to Ed after trying to decide between a few different vendors. I couldn't be happier from my decision!What did 243 heads come on? To begin, the LS6 engine was first introduced in 2001 and used until 2006. It came equipped with 243 cylinder heads which were initially designed for C5 Corvettes. However, the popularity of the LS6 spread to other applications such as trucks with the LQ4 and LQ9 engines.This also means that they are usually cheap to collect or replace. 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 ...The valves on LS3 heads are designed to be larger than those on stock LS heads to improve airflow, leading to increased power output. Standard valve sizes for LS3 heads include 2.165 inches (intake) and 1.590 inches (exhaust). However, it's not uncommon for LS3 heads to feature even larger valves. For example, some aftermarket LS3 heads may ...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.DESCRIPTION Professionally rebuilt 5.3 Chevrolet / GM cylinder heads. These cylinder head's casting numbers are: 243 ONLY! THESE HEADS ARE THE SOUGHT AFTER 243 CASTING NUMBERS ONLY THIS IS FOR A PAIR HEADS! DETAILS Heads are thoroughly cleaned and inspected Pressure tested to ensure no cracks or leaks Guide work performed / replaced with new guides as necessary Valve job / performed on Serdi .... The 243's have bigger valves which do better on 4.0&quoCompression Ratio Calculator - Wallace Racing. 3.622" x When it comes to fastening two objects together, cap head bolts and cap head screws are two popular options. They both have a similar appearance, but they differ in their applicati...Before I get into the the meat of the book—the spec charts—there are a few things you need to know. They include information on converting from a cathedral port to a rectangular port, some thoughts on the merits of cathedral versus rectangular ports, and a bit of cylinder head theory. The intake manifold is the most important element in swapping from a cathedral to a rectangular port head ... The cheapest way is to have your 243 heads ported, probably l What did LS 243 heads come on? For nearly six years, the LS6 engine was equipped with 243 heads as standard. This configuration was designed to power the C5 Corvette s, however its popularity soon saw it being implemented in other vehicles such as LQ4 and LQ9 trucks and even Camaros and Pontiac GTOs. I believe that any 5.4L sohc motor has the P.I. heads ...
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