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 headsXavi's Barcelona exit is a sad conclusion for a legend damaged by the club he loves. Dermot Corrigan. May 24, 2024. Returning to Barcelona as the head coach was a long-time dream for Xavi, but ...5475 posts · Joined 2005. #4 · Jan 19, 2015. Put in stock 4.8 pistons, they're already flat tops and its what the L33 5.3 is with 243 heads. Stock compression on them is 9.9:1, it'll be a little higher with stock 5.3 heads but if it were me I'd go ahead and do some milled 243's with some bowl work. 2001 GMC Sierra RCSB.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 …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.Guys I'm located in Biloxi, MS 39532. The Heads, injectors, and fuel rail have 40,000 miles on them, springs, cam, ported intake were installed at 30,000 miles. The combo made about 418/388 on one dyno and 397/374 on another in an 2006 LS2 M6. 243 Heads SOLD LS2 Ported Intake SOLD LS2 Stock Injectors $100 + Shipping & paypal LS2 Stock Fuel Rail ...1291 posts · Joined 2007. #12 · Feb 3, 2010 (Edited) i purchased at set of 799 heads last summer for $100.00 bucks ,from another member on this forum. keep us posted when this project is complete. im going the budget daily driver route myself. i will be topping mine of with a fast,and a ported throttle body.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 ...Spotter's Guide to Identifying Factory LS Intake Manifolds. With some 40 GM part numbers covering the list of intake manifolds for more than 25 variations of the Gen III and Gen IV LS engine family, identifying a swap meet intake or planning a manifold swap can get a little confusing. This handy spotter's guide to LS intake manifolds should ...Jun 13, 2015 · The early 5.3's had either 706's or 862's unless it was a "L33 HO 5.3" which only came in some trucks. My 04 Rainier has 862's, my 02 Avalanche had 706's. The 243/799 heads are one in the same, excluding the 243's that came on the LS6 motors as they had hollow stem exhaust valves and better springs, but everything else casting …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 ... The 4.8 and 5.3 come with 799(243) heads from the factory nowadays. You can mill the heads to maintain the compression, but the heads will bolt on. PROJECT ...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 …Update on 601 heads on 350. I finally got the last of the tuning issues cleared up, and the 601 heads are working great. The history of the project is in another thread in the Engine section, but the upshot is they are doing everything I wanted. I had 200 CC IEs on it and switched to these, the smaller ports and chambers give me tons of low end ...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.If your really sly, the best engine to find is a 88-91 Roller Cam 360 with the 308' cylinder heads. What do those come on, you ask? 88-91 W series trucks 88-91 D250 88-91 4x4 Ramchargers *(notice) nothing in the Car Line Good Luck.Jun 3, 2022 · The 243 heads come with 1.7 - ratio rockers responsible for opening and closing the intake and exhaust valves. The configuration is different from the 1.8 ratios found on most other LS heads. The main benefit of this is that it allows for greater lift, which results in more airflow and more power.I am debating on either upgrading my 2004 Goat with either 243 heads or upping my cam. I made a poor decision and put the GM Hot Cam in there and want more ponies. Now I know I'll gain from the heads but I think I could gain more with a bigger cam but don't want to sacrafice the drivabilty. My goal is 390-400 RWHP and 500 on the spray.streetknight2 Discussion starter. 1075 posts · Joined 2011. #1 · Apr 30, 2013. Got a LQ9 (flat top motor) got a set of 243's off a TBSS. Building a carburated setup in a Fairmont. I want the most out of the combo and don't mind fly cutting the pistons. Will probably hit it with some nitrous but no more than a 150.243 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.St. Jude Donor '03. 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 243 is an excellent head and has a huge potential----They can port them to around 220 cc's on the intake and about 80cc's on the exhaust (stock exh is 75cc) With the left over $$ savings you can buy. 1. Underdrive crank pulley ( an honest 8-10 RWHP across the ENTIRE RPM range) 2. Better X=pipe 5-7 RWHP.05 and newer l33 aluminum 5.3 come with the 799 and I believe some vettes even had them on the ls2. The 243's came on the ls6 with sodium filled valves, and with normal valves on alot of the ls2 engines and very new 5.3's like 08+ iirc. 799 is basically a copy of the 243.The 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.The two types of heads, 241s and 243s are found in many vehicles. The combustion chambers for each of these types differ slightly: 243 heads have an internal volume of 65cc while 241s have a 67cc size. Due to this difference in size, the compression ratio for 243 heads is higher than that of 241s, meaning that more power can be …1582 posts · Joined 2005. #1 · Oct 15, 2005. What year explorers did the GT40 come on, I think they started in 96 right?? and the GT40 P's were 98 right?? Im going to the local yard to do some hunting for some heads, is there a big difference in the GT40p's vs. the regular ones?? Im just trying to put together a real cheap setup, for a daily ...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...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.The LS 243 Cathedral Port cylinder heads are renowned for their exceptional performance capabilities over the other cathedral port offerings. These heads are designed to maximize airflow and combustion efficiency, taking advantage of the LS6 engine's power potential. With their cathedral port design, larger valves, and improved airflow ...1232 posts · Joined 2010. #2 · Jun 29, 2010. The originals from the 60's and early 70's didn't have the bowtie, but I believe the later ones did. Not sure on that. Those heads were on the L78 396's in Nova's, Camaro's, Chevelles, etc. and the ZL1, L88 and L89 427 in Corvettes. Yes these were fairly rare from the factory.The 799 and 243 casting Cathedral-port cylinder heads can be CNC ported to flow close to the aftermarket heads. With a bigger cam you can mill the heads for up to 10.8 compression which runs on pump gas. ... 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 ...May 4, 2020 · C5 General - What years trucks/tahoes came w/243/799 heads - I need to scavange valve covers and ignition coils and brackets and ignition coil harness for next project. I just got for my 97 C5 243 ZO6 heads that came off from 02 ZO6 .The valve covers are perimeter bolt on mine and 243 heads are center bolt and coils...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.NEW GM LS 243 HEAD - 4.8L, 5.3L & 6.0L. $349.99. 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. Add to Wishlist. Skip to the end of the images gallery. Skip to the beginning of the images gallery.196 (Nash Design) American Motors' first straight-six engine was the 196 cubic inch (195.6 cu in (3.2 L)) produced from 1952 through 1965, initially as a flathead (L-head) side-valve, and later an overhead valve (OHV) version.. The 196 was originally designed to be an economy engine by Nash Motors, the company that merged with Hudson to form AMC in 1954.243 cylinder head. Jump to Latest Follow 826 views 2 replies 2 participants last post by myrado2012 Jun 9, 2014. M. myrado2012 Discussion starter 2 posts ...The 882 head is the most produced chevy cylinder head over and above all other casting numbers. They were produced in the millions and if you are rebuilding a 70's era 350, more than likely it will have a set of these heads on it. There are different variations of the 882 head, which has been stated already.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.Feb 16, 2012 · 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.05 and newer l33 aluminum 5.3 come with the 799 and I believe some vettes even had them on the ls2. The 243's came on the ls6 with sodium filled valves, and with normal valves on alot of the ls2 engines and very new 5.3's like 08+ iirc. 799 is basically a copy of the 243.1232 posts · Joined 2010. #2 · Jun 29, 2010. The originals from the 60's and early 70's didn't have the bowtie, but I believe the later ones did. Not sure on that. Those heads were on the L78 396's in Nova's, Camaro's, Chevelles, etc. and the ZL1, L88 and L89 427 in Corvettes. Yes these were fairly rare from the factory.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.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.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.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".The LS engines with 799 heads are 5.3L and 4.8L. The sophisticated architecture, cathedral-shaped port, and smaller combustion chamber work amazingly on these truck engines. The smaller combustion chamber with a higher compression ratio offers increased power output. The 799 LS heads boost horsepower up to 25 hp.What did LS 243 heads come on? The 243 head came on the more powerful LS6 engine from 2001 to 2006, and was used in C5 Corvettes. Later engines like the truck-spec LQ9 and LQ4 used the exact same port design as the LS6's 243 heads, but had 6 cc larger combustion chambers.many of the factory 243's and 799's are plugged yes. You don't need the parts from your 241's, cept for the coolant sensor hole plug on rear passenger side like mentioned above. GTO parts hoarder. LsSlow Discussion starter. 311 posts · Joined 2012. #3 · Apr 4, 2014.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 ...The 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 ...This listing is for a rebuilt GM 5.3 5.7 or 6.0 liter V-8 cylinder head casting 243 only you must have an exchange with the exact same casting number. 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.799 vs 243 heads. Looks lke they came across a bunch of them as they are listing on ebay also. After searching today seems like a truckload became available all of the sudden. From what I can find on the truck forums these are the same as 243 heads without hollow valves or sodium filled I think it was.Apr 11, 2010 · 45 posts · Joined 2006. #4 · Apr 12, 2010. I'll recommend TFS 215 heads and a 224/228 comp cam. A friend of mine has this package and I was really impressed. With a ported fast he made 450 rwhp and the car idled and drove great. It was actually a little tame for my taste, but sounds like what you're looking for.Mar 26, 2012 · From how I understand it to work...and I'm no expert... 317 heads are designed for a 4.000" bore motor. Your LS1 is a 3.900" bore motor. Therefore, you'll need a thicker gasket on your heads. Stock heads are 67cc and you are going to a 72cc. This is going to drop your stock 10.5:1 compression down some.Some of the most sought-after cylinder heads for GM s LS engines are the 243 heads. They're often referred to as LS6 heads, as they were originally used on the 2001 to 2006 LS6 engine. These 243 heads feature a distinctive D-shaped exhaust port coupled with cathedral-shaped intake ports that provide better breathing capabilities and …Me too: 224/228 0.595" cam, ported and milled 243 heads w/ Cometic gaskets, ported FAST, headers. With 3.42 gears (MN6) it turns 441 RWHP, 412 RWTQ. With some tuning it idles nicely and behaves well in traffic, too.The LC9 engines also came with 799/243 heads. In 2008 and 2009, Chevy also had a simpler 5.3L engine designated the LH8, which can be identified by the letter L in the 8th digit of the VIN. ... The early LQ4 engines (1999 and 2000) were the only LS based engines to come with an iron cylinder head (cylinder head casting numbers 373 and 873 ...Usually, conventional small-block heads did not flow nearly as much air as the best factory cathedral port heads. The 243, 799, and 317 castings of these cathedral port heads could flow up to 250 cfm which was a major improvement over what preceded them. But the LS3 heads took this concept even further and were capable of an …Nov 3, 2009 · 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.1969 302 DZ Heads. Hi, this is my first post on this forum. I am restoring a 69 Camaro. The heads are 3927186 castings witha date code of J 11 8 and J 28 8. They are the big valve 2.02 and 1.6. Untouched and unported.What I want to know is, did the Z28 motors heads come with guideplates or without in stock form ?741 posts · Joined 2004. #11 · Jul 12, 2022. If you want to make power with a 5.3, you need compression or boost. The 799/243 head is great for flow, but given that your engine originally came with 706 heads, it likely has dished pistons. The 799/243 will kill what little compression you have now unless you mill them.Posted March 1, 2011. On 2/28/2011 at 11:24 AM, Krambo said: Well, 243's are a good way to increase compression. With a stock 64cc combustion chamber on the 243's and your LQ4, your looking at about 10.5:1 SCR vs roughly 9.4:1SCR with the stock 71cc 317's...gasket dependent. The bump in compression will be nice along with the better designed ...My plan is to use my 243 heads and intake on the l92. I’ve got a new gmpp 12638427 cam as well as a 05 lq4 cam.Not looking to make huge HP, just looking to optimize fuel efficiency and maybe nice exhaust sound. also don’t want to loose lo to midrange performance. Between 400-500 HP would be nice. any thoughts or …On our Mast heads, the LS3 head offered both more intake and exhaust flow than the cathedral-port heads, resulting in an intake-to-exhaust flow percentage (372/261 cfm) of 69.89 (meaning the ...How much do 243 heads weigh? Which heads are better 706 vs 862? Are 799 heads the same as 243? How much HP can 706 heads handle? What did 823 heads …I guess I'll start: "243 Heads" come standard on LS6 and LS2 Engines. They are a straight swap onto an LS1 Engine. They will give you more power, because they flow better than the "241 Heads" that are on the LS1 Engine. You can tell if its an "241" or "243" head by the stamping on the top front side of the head. -Nick.Off the shelf VN heads outperform B-Cast heads in flow rates. VN heads on an early motor will yield higher horsepower with a narrower torque band vs less HP with early heads and a wider torque band.. Can you stroke a 253? To get the right deck height with a 253 mini stroker you need to use the 305 piston which neccesitates the 0.110″ to 0.140″ overbore.. 243 heads.These were on my 2000 Camaro SS when I bought it with 12000 If you’re gonna do a L33 swap into anything you may may as well lea 243 heads are 243 heads (different hardware for different short blocks though, i.e. LS6, LS2). 806, 853 and 241 all share the same ports. They are cast in different manners so the surface finishes are different which may slightly influence turbulence at certain lifts. The 853 and 241 heads have the same chamber size.Jul 16, 2007 · 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. Head gasket repair can be an expensive, but necessary repair The casting numbers and heads you want for the Z28 are the 186 numbers you mentioned. They will also have a julian date code below the casting numbers (under valve covers) and should be matched to your motor if thats what you are trying to do. 3927186 (DZ 302 Heads)The other 041 numbers you entered are for other small block applications and and ... The 241 heads were used on 5.7L LS1 applications and are considered by...
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