According to the internet, some of the best cathedral port LS heads available have a 243 casting code, and would have originally come on 2001 or newer LS2 and LS6 engines. They have larger intake and exhaust runners and a smaller chamber, meaning more compression and better airflow.The LS6 did not use titanium valves. They are hollow stem stainless valves...the intake valves were kept hollow, the exhaust valves were filled with potassium/sodium to better absorb the more intense heat that valve is exposed to. Originally Posted by Y2Kvert4me. The LS6 did not use titanium valves.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 headsJan 14, 2018 · I know 243's are good but didn't know if 862's are any good when they're right in front of me. They won't flow as good as 243 but you'll have better compression vs 243. You can have them ported for a reasonable price and have a good valve job done on them to make them perform. They'll never be rock stars but they'll do fine with that cam.243 cast heads are from an ls6 or ls2. 5.3 heads are numbered 853. Set up sounds like it will be a dyno queen. big numbers on the rollers but very lazy down low and slow on the track and street. btw i may be wrong but i don't think the small chamber on the 5.3 heads combined with the huge lift and duration on the ms4 and 2.04 1.60 valves will clear without flycutting just my .02Feb 18, 2024 · 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, they offer a high degree of consistency since they are ...The LC9 came in GM trucks and SUVs in 2007-‘11 and made 315 horsepower right out of the box. It’s a Gen. 4 5.3L aluminum-block engine, so you’re getting the better intake manifold, connecting rods, and ECM. The engine also had 799 or 243 casting heads which are closely related to the LS6.The LS6 did not use titanium valves. They are hollow stem stainless valves...the intake valves were kept hollow, the exhaust valves were filled with potassium/sodium to better absorb the more intense heat that valve is exposed to. Originally Posted by Y2Kvert4me. The LS6 did not use titanium valves.Feb 9, 2022 · Factory has the 862 heads. I’ve been offered a 5.3 block with 243 heads on it for $300. Would the stock 243 heads work better on it than the 862 heads? Obviously they need to go to the machine shop to be looked over but without any alterations to the stock form, which is the better head? Engine is stock other than cold air intake.The LQ4 is a 6.0L LS (Gen. 3) small block engine used in GM trucks between 1999 and 2007. For marketing purposes, it was also known as the Vortec 6000. The engine specs and information listed here is for the stock LQ4 engine. Mechanically similar, General Motors’ LS and LS-based Vortec engines wound up on almost every branch of the GM family ...Some early LS heads from 98-01, both the 853/806 LS1 and the 706/862 5.3/4.8 had the casting notch. The notch disappears sometime in 2001 but nobody is sure. Only way to verify is to physically look for the notch on the gasket surface. If the heads have the notch, you must use the early graphite gaskets.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.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.The result of a point of compression adds 1.5 to 2.0 percent, or about 10 hp, automatically to the AFR 245 heads. To make this a fair fight, we gave the two factory heads the same percentage and ...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 ...C5 Tech - Need some help with 243 heads.. Ques. - Are the 243 heads off a 2010 silverado the same as the 02-03-04 ZO6 243 heads..They say they will fit the LS engines.These cylinder heads feature all the benefits of the Magnum design, but step up the power potential with larger, better flowing ports. The Magnum R/T increases intake runner volume from the ...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 ...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.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 ...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.May 24, 2012 · I've heard very good things about the sodium filled valves, and that they really make the difference between the Ls2 and Ls6, but they're not worth the extra $200+ dollars you're going to spend on the heads. Sure, they might be awesome for me, but when i'm getting a hell of a deal on LS2 243's, i'm gonna go that route. Just my 2 cents.If .600 or higher, go with Pac 1518s. Plenty of good tech info right here too. (Not sure why you're here if you want to knock the forum) Most of the info I got to build my 6.0 came from right here. '01 ECSB 4x4, '04 6.0L LQ4 Shortblock, 243 Heads Milled .035 11:1 Compression, Pac 1218 Springs, Yank PT3200 Stall, Comp Cam 220/224, .581/.581 ...BARE GM LS 243 HEAD - 4.8L, 5.3L & 6.0L. 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. Generation III cylinder head for V8 truck, van, SUV and perfomance applications often called an LS6 head. It ...doing math an saying you have 2cc worth of valve notchs i got you around 12-1 comp wise with the 58.5 in for head cc an pistons out .006..with the 60cc 243s i got you at 11.8-1 with 2cc notchs,.006 out and .040 gaskets..hope this helps. I had them actually cc'd after I removed em.. 61.5.. Steve. 408, th400, 1100rwhp..The General Electric LM2500 engine with its 243 heads is a powerful and reliable marine gas turbine that is widely used in naval and commercial marine applications. With its high power output, efficient design, and robust construction, the LM2500 engine is capable of delivering exceptional performance and reliability in even the harshest marine ...Fred Huntington of RCBS fame came up with a similar cartridge, the .243 Rockchucker. The idea was to have one dual-use cartridge that could drive 80-grain varmint bullets in the 3,200 f.p.s. range ...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.Not the hollow/sodium filled valves found in the 02-04 Z06. With a decent size camshaft, you will need to purchase another set of valvesprings for $250. So that would bring your total to $750. For only $500 more, you can have a set of Patriot CNC ported 243 heads assembled. That's going to be a good gain in performance for just a little bit ...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 ...6000. HO 6000 engine in a 2003 Cadillac Escalade EXTThe Vortec 6000, or LQ4, is a V8 truck engine. It is a bored version of the Vortec 5300. Displacement is 6.0 L (5967 cc) from 101.6 mm bore and 92 mm stroke. It is an iron/aluminum design and produces 300-325 hp (224-242 kW) and 360-370 ft·lbf (488-502 N·m).The injector flow rate, min injector pulse, short pulse adder and the offset vs volts data is what you need to copy over. 2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy. If you don't post your tune and logs when you have questions you aren't helping yourself. Quick Navigation GM V8 Tuning - Engine, Gas (Gen 3) Top.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.I’ll give ya threefiddy, a jar of Vegemite and a box of boomerangs that may or may not come back. -- Olly. ... thats what the guy who did my heads did...scanned the as cast 243 and then started programming... 2005 GTO QSM,418" NaturallyAspirated,Bullet Racing cam,243 heads,6speed,Kooks 1-3/4" headers w/cats,matchported FAST …Suicidal Racing. 26755 posts · Joined 2006. #6 · Jul 31, 2012. Maybe its me an how i keep reading it..but it seems you think 317s flow more then 243s or 799s...they have the same ports as a 317..,317 just has a larger chamber 72 or 74cc vs the 243/799 64cc... some 5.3s have 799 heads stock.not sure on yrs though.Some early LS heads from 98-01, both the 853/806 LS1 and the 706/862 5.3/4.8 had the casting notch. The notch disappears sometime in 2001 but nobody is sure. Only way to verify is to physically look for the notch on the gasket surface. If the heads have the notch, you must use the early graphite gaskets.LS engine junkyard performance parts ! NNBS TBSS intake manifold and 243cylinder heads from a 2007 - 2008 Chevy Avalanche LC9 aluminum 5.3 gen4 LS engine. R...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 ...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 ...What Are 243 Heads? Also known as 799 heads, 243 heads are the best performing aluminum cylinder heads that were standard on 3rd generation GM LS6 & …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 ...Ai 218cc CNC'd GM 243 LS2/LS6 Cylinder Head Package. GM's #243 casting is a great cathedral head that has phenomenal potential with the right work applied. Our 218cc CNC work is a good choice for guys who would like a bit more gain than our Performance Rebuild, but are not inclined to port the casting to its potential.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.Find Parts and Accessories 243 ls 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! ... 243/257 dur @.050", .689"/.672" lift, 108.5 deg LSA. Part Number: CXM-03-08-0098. Not Yet Reviewed. Estimated Ship Date: May 23, 2024 if ordered today. Free ...Mar 13, 2018 · Run with the same air/fuel ratio, timing, and boost, the turbo 5.3L produced (ironically enough) 706 hp and 641 lb-ft of torque. Despite running just on the wastegate springs, the boost with the ...LS engine junkyard performance parts ! NNBS TBSS intake manifold and 243cylinder heads from a 2007 - 2008 Chevy Avalanche LC9 aluminum 5.3 gen4 LS engine. R...Easier to replace a head if more than a few. Yes, it's 2009. I've already discussed it with service guys and they said that it's ok, 823 and 5364 can be installed together even in Arlington on factory because it's absolutely the same. This is an older thread, you may not receive a response, and could be reviving an old thread.The LS3 head at 265 cc of volume compared to 214. cc for the 243, has much less air velocity at low lifts and low rpms. Now. GM also put the LS3 heads on an engine with 30 more cubic inches; but with an intake runner volume equal to the old big block oval ports, they really seem to shine on 427 cid and larger engines.The ls6 heads would be 243 heads some were sodium filled vales some standard valves depending on what car they came on. the 799 casting head is the same as the 243 and came on some motors a 243 on one side and a 799 on the other. ... If they do then it would have come off of a 02-04 z06 which have lighter intake valves as well and usually run a ...The outer planets Jupiter, Saturn, Uranus and Neptune all have shorter days than Earth. Among the terrestrial planets, Mars has a slightly longer day than Earth at 24 hours 37 minu...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.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.Here is a 2005 gmc extended cab 4.8 I did a cam swap on and put some 243 heads. Truck made 300rwhp on a mustang dyno.You can say satisfied customer!The L76 is a 6.0L, Gen. 4, aluminum small block engine used in both GM cars and trucks from 2007 to 2009. This article is dedicated specifically to the truck and SUV version of the L76 engine. (NOTE: Don't confuse the engine specs here with the L-76 5.4L small block which could be found in the C2 Sting Ray Corvette in 1964.)doing math an saying you have 2cc worth of valve notchs i got you around 12-1 comp wise with the 58.5 in for head cc an pistons out .006..with the 60cc 243s i got you at 11.8-1 with 2cc notchs,.006 out and .040 gaskets..hope this helps. I had them actually cc'd after I removed em.. 61.5.. Steve. 408, th400, 1100rwhp..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.All other manufacturers of rifles offer this caliber. The .243 Winchester represents a successful effort to develop a light deer rifle caliber that could hold its own with the high-velocity .22s for long-range use on small targets and still be adequate for larger animals. The .243 does this job well. It eliminates the need to own two different ...You did good. I would charge $75 per head myself. They are mostly the same as a 906 head, but with induction hardened exhaust seats. The runners might have slightly less volume, but you will never see any difference on the street. Do a 3 angle valve job, new guides, mill the heads 0.010". You could do a little gasket match on the intake runners ...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.Mar 23, 2014 · But, outside of that I figured that lightly messaging the heads and the addition of an appropriate aftermarket camshaft (about 220/230 duration with .570-.585 lift and a 114 lsa) would put me in the ball park. Now, the owner of the heads I bought said they did not have the sodium filled valves we've come to expect from other 243 heads.Feb 26, 2007 · Another thing to consider is the life span of the MTI springs. The stock GM springs are guaranteed for three years, or 36,000 miles but generally last the life of the engine. Would you have this assurance with the MTI springed heads. Below are some GM numbers for 243 heads as a comparison. Stock CNC'd LS6 heads I E.100 .200 147 111It happens to even the best DIYer: the simple process of removing a screw becomes a struggle when the screw refuses to budge and the head of the screw becomes stripped. But not all...6 days ago · The .243 Winchester (6×52mm) is a popular sporting rifle cartridge. Developed as a versatile short action cartridge to hunt both medium game and small game alike, it "took whitetail hunting by storm" when introduced in 1955, and remains one of the most popular whitetail deer cartridges. It is also commonly used for harvesting blacktail …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 ...Mar 21, 2014 · KCS. 730 posts · Joined 2009. #9 · Mar 22, 2014. The seat insert itself is 2.02", so going bigger than that would be pointless without swapping out the seats. To use a 2.04" valve on a stock seat, you would have to cut the seat small at 2.02" so it is still on the iron seat, which I don't think is any better than just using a 2.02" valve.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.since then ive dropped in the HKE 408, reworked the 243 heads, stepped up to 1 7/8 stepped to 2" headers and true dual 3" exhaust through an x pipe. before it was a 1 3/4 header with single 3" exhaust. also went from 4.10 gears to a 4.30 and stepped the converter from a 3600 to a 4400. also the addition of another kit for a total of 250 instead ...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 243/799 3cc bigger combustion chamber might not seem like much but let's look at the factory Compression Ratio as seen here. And then compare it with the 243/799 cylinder head ...A 317 head on an LS2 will be 10.0:1. A 243 on a LQ9 will be 10.9:1. Only major difference is combustion chamber cc. I would not go with less then 10.0:1 compression on a 2300. Mill a set of 317s to 70cc, run an LS9 gasket and head studs. C6 M6 Vortech 857/725. 14' GMC RCSB TVS1900.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 …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 ...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.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.The General Electric LM2500 engine with its 243 heads is a powerful and reliable marine gas turbine that is widely used in naval and commercial marine applications. With its high power output, efficient design, and robust construction, the LM2500 engine is capable of delivering exceptional performance and reliability in even the harshest marine ...The LS2 is a 6.0L, Gen. 4, aluminum small block engine that came in both cars and trucks. The engine specs and information we're sharing here are for the LS 2 that was used in GM trucks and SUVs between 2005 and 2009. The information listed here is for a stock LS2 truck engine. Mechanically similar, General Motors' LS and LS-based Vortec ...Sep 28, 2011 · 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 ...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.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.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 5.3L HEADS vs 241, 799/243 vs 317s. WHICH HEADMAKES MORE? We compared the four most popular stock LS heads in a back to back shootout. We ran the 706/862...The low lift numbers really played out in the torque curve with this combination, as the L92 heads and, France is over twice the size of England (37 percent larger), containing 643,801 square km, while the United K, The 243/799 heads made more power than the 317's in back , But, the combustion chambers are bigger than the 5.3 heads. You need to mill the 243 heads about .020" , Dec 27, 2022 · What did 243 heads come on? To begin, the LS6 engine was first introduced in 2001 and used u, Hey all, I'm planning on doing a ported fast92 and getting my stock heads worked for optimum , 243 04 up LS6 aluminum center bolt 5.7 ***These castings were also used around 05 in truck appl, DualQuadDave Discussion starter. 1019 posts · Joined 2017., 799 LS Engine Cylinder Heads are some of the most recent cylinde, The LH6 engine is a 5.3L Gen. IV aluminum engine that replac, However, unlike the 243 heads, they do not require c, Milling 243 heads for LQ9. as many of you have heard my lq9 6., Richard is the man with any question you could possibl, assembling my ls1 with 243 heads., However, unlike the 243 heads, they do not require c, Throughout the entire 15-year Anniversary celebration, y, After installation of the 706 heads, the power jumped to, Getting the right head for your needs requires you to know a l.