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 ...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 ...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 headsAug 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 ...It is an aluminum block 5.3 with either 706 or 862 heads, NON DOD. The 05-09 GMT360's got the LH6 and the 07+ will more than likely have 243/799's. In 07+ all the 5.3's started getting the 243/799 heads. The early years will obviously depend on what 5.3 equipped vehicle you have.The 243 heads are factory cylinder heads that were used on the LS6 engine found in the 2001-2004 Chevrolet Corvette Z06. They are made of aluminum and have a small combustion chamber, which can result in high compression ratios.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.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 ...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.The stock 348 (right) heads carried 1.94/1.66- inch valves while the standard passenger 409 heads carried 2.06/1.72- inch valves. The high-performance heads contained 2.19/1.72-inch valves, and the growth in valve size required thicker, heavier, valve springs to support the new cams with more lift and duration.Quote: Originally Posted by lil john. True Tuskyz, also the 821's have less meat, *Some porters don't like to go over 270'cc while the the 823's are good to around 280'cc. Phil @ Advanced Inductions gave me a quote on the 280cc version on my #821 heads. Reply Like. 08-12-2016, 09:11 AM.Researchers have discovered abundant colonies of mycobacterium in residential shower heads. HowStuffWorks takes a looks and offers a quick fix. Advertisement Taking a shower should...799 LS Engine Cylinder Heads are some of the most recent cylinder heads on the automotive parts market. The cylinder cast architecture is with a semi-permanent mold method. The 799 cylinder heads are in the similitude to the 2004 LS2 cylinder heads due to the triangle casting marks similarity. However, unlike the 243 heads, they do not require ...Even stock 243 heads flow great. AFR did a comparison between many different heads vs their AFR 215 & 225s on another site and the stock 243s stepped up hard even matching the 225s flow at .550 lift and besting the 225s at .600 lift (albeit on a 4.125 bore which is pretty big, LS1 is 3.90 and LS2 is 4.00). ... Come discuss mods, horsepower ...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.Jan 18, 2014 · 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 ...799 LS Engine Cylinder Heads are some of the most recent cylinder heads on the automotive parts market. The cylinder cast architecture is with a semi-permanent mold method. The 799 cylinder heads are in the similitude to the 2004 LS2 cylinder heads due to the triangle casting marks similarity. However, unlike the 243 heads, they do not require ...34 posts · Joined 2015. #1 · May 21, 2018. My 04 gto has full bolt ons headers, cai, slp 2.5 exhaust and already been dyno tuned. 346hp. 365tq I'm going to bolt on ported 243 heads and upgrade the valve train for the 228r cam. What would be my new hp-tq numbers?? 228-230 duration at 50 588-588 lift. 112lsa m6 trans.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.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.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 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.243/799 LS CNC Ported Heads. Speed Works has teamed up with Wilkes Performance to bring you the most powerful heads available. We have a few options you can purchase such as a pair of Stage 1, Stage 2, Stage 3, or Stage 4 LS 243/799 Cathedral casting 5 axis CNC Porting with stainless valves and WP .660 dual race springs with WP titanium retainers.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.(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...Bandaging that gnarly cut before you head to the emergency room? Snap a pic first. We’ve advised you before to take photos of your children before a big outing, screenshot your boa...Pontiac 1973-1974 Cylinder Heads. No "H" stamp on early 1973 heads. May 7, 1973 is the head assembly date, NOT the casting date. Heads with casting dates starting around mid-March 1973 to mid-April 1973usually will have screw-in studs. Combustion chamber depth measured from quench side. Stud Boss Type refers to casting design around rocker arm ...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...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.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 317 heads can flow up to 20 cfm at specific lift points more than the 706 heads. However, the stock 5.3L 706 heads outperformed the 6.0L 317s. What LS engines had 243 heads? The 243 heads were utilized in the LS6 engines manufactured between 2001 and 2006. These heads are known for their exceptional power and efficiency.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 ...3012 posts · Joined 2008. #1 · Apr 14, 2012. I have a 2004 Aluminum 5.3 with 70k miles that has 862 heads on it. I also have a set of 243 heads off of a 2009 Aluminum 5.3. Which heads should I use? I've been told the 243's flow better and the 862's supposedly raise compression .5 a point.Couple of things to remember: 1) Milling- every .006 is 1cc of chamber. 2) The .040 gasket will add quench, which is GREAT to protect against detonation, and being that it is thinner than the GM gasket (stock gasket is .058), it performs like a milled head minus the loss of flow milling a head will do.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 ...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.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!Bumpers said: yea they will bolt right up. 799 is the same as a 243 head that comes on the ls2/ls6 ect.. they will bolt right up and should give you i think around 10.5to1 compression... they are pretty good stock heads. im running a set of 243s milled and p&p on my lq4. you will be just fine just need some tuning wich you will need anyways.Pontiac 1973-1974 Cylinder Heads. No "H" stamp on early 1973 heads. May 7, 1973 is the head assembly date, NOT the casting date. Heads with casting dates starting around mid-March 1973 to mid-April 1973usually will have screw-in studs. Combustion chamber depth measured from quench side. Stud Boss Type refers to casting design around rocker arm ...Description. GM GMC CHEVY 5.3 5.7 6.0 LS6 LS2 CYLINDER HEADS CASTING 243. GM GMC CHEVY 5.3 5.7 6.0 LS6 LS2 CYLINDER HEADS CASTING #243 ONLY REBUILT. STOCK HEADS. THIS SALE IS FOR CASTING NUMBER ENDING IN 243 ONLY. CATHEDRAL INTAKE PORTS. VALVE SIZES intake 2.000 ex 1.552. CORE RETURN REQUIRED. These heads are sold as a pair.53 posts · Joined 2010. #4 · Nov 12, 2017. Unless you're spending money on AI ported 243's, go with the LS3's. LS3's flow more and will keep the port velocity up compared to the typical hogged to hell port jobs I've seen on factory cast heads. There are very few shops that port heads well, with AI being the best around.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.Newly reworked 243 heads versus AFR heads. Hi guys, I have a 2006 C6 A6 with 145,000 miles on it. Mods include K&N breather, LG Long Tube Headers, and a Circle D stall converter. I recently swapped my LG G5XB cam for a new LG G5X3 114 cam. I have factory 243 heads that have just had a competition valve job including new guides, valves, Comp 921 ...Jan 3, 2009 · 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.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 ...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 ...Stock heads with Brian Tooley top end kit installed by PCMOFNC. 2008 Heads had 60k at install and 64k when removed for my LSX head swap this year. Perfectly fine. I can give you my personal info and you can verify with Kelly. 450 OBO plus shipping and PayPal fees. Sent from my SM-G935T using Tapatalk.Did the 5.3 come with 243 heads? When it comes to the 5.3 engine, it is commonly equipped with 243 heads. This has been the standard for many years and is also seen in 4.8 engines as well. For example, the LS6 engine designed between 2001 and 2006 came with these factory-designed 243 heads.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.Phoenix Discussion starter. 6208 posts · Joined 2004. #1 · Sep 14, 2007. My dad just got a brand new Silverado with a 4.8l as a rental. I popped the hood to see what engine it had, and I noticed that the head were 243 castings. Are these the same that are used on the LS2?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 ...The 317 heads can flow up to 20 cfm at specific lift points more than the 706 heads. However, the stock 5.3L 706 heads outperformed the 6.0L 317s. What LS engines had 243 heads? The 243 heads were utilized in the LS6 engines manufactured between 2001 and 2006. These heads are known for their exceptional power and efficiency.Even stock 243 heads flow great. AFR did a comparison between many different heads vs their AFR 215 & 225s on another site and the stock 243s stepped up hard even matching the 225s flow at .550 lift and besting the 225s at .600 lift (albeit on a 4.125 bore which is pretty big, LS1 is 3.90 and LS2 is 4.00). ... Come discuss mods, horsepower ...They ported my fast and 243 heads with there 226cc cnc program. Car was makin around 435 before and previously ran a 10.93 Now with 480/410 I cant wait to see what this thing will do now. Hopefully get close to the 2nd fastest 346 NA car this year. We will find out soon. Reply Like 02-07-2012, 10:28 PM ...1713 posts · Joined 2004. #10 · Jul 28, 2020 (Edited) I have stage III ported (243) LS6 Heads/cam, Fast 102lsxr, 105mmTB, 100MAF, etc. I at at 437rwhp since last tune, since then have added 1 piece CF driveshaft, forged rims, etc. Here is an idle clip of mine, not sure this sounds crappy.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.799 LS Engine Cylinder Heads are some of the most recent cylinder heads on the automotive parts market. The cylinder cast architecture is with a semi-permanent mold method. The 799 cylinder heads are in the similitude to the 2004 LS2 cylinder heads due to the triangle casting marks similarity. However, unlike the 243 heads, they do not require ...We didn’t want to spend big money on a fancy set of CNC-ported heads, as we’d already used up most of our budget on that beautiful K1 Technologies rotating assembly. 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 …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...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.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 valves.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 ...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.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.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 ...Ever scratch your head when you're frustrated or thinking? HowStuffWorks found out how this tic became the signal for so many social expressions. Advertisement If you've ever had ...706 Heads on a 06 5.3. Jump to Latest Follow. 16K views 9 replies 6 participants last post by LiftedLQ9 Nov 12, 2008. B. Biggsw784 Discussion starter. 246 posts · Joined 2006. #1 · Nov 10, 2008. I am pulling the heads off my 5.3 to replace the lifters due to one of them collipsing. While I have these heads off, I was going to get them milled ...The 243 heads came on the powerful LS6 engines from 2001 to 2006. Although the heads were initially made for C5 Corvettes, they later found their use in engines like the truck-spec LQ9 and LQ4. The LQ4 and LQ9 had 6 cc larger combustion chambers. LS6 was also used in some Camaros and Pontiac GTOs. The 243 heads are cast out of aluminum alloy ...IMO, a 243 CNC head and LS6 intake (or spend the chese for a FAST 92) will definately make a great street motor. i made peak power at 6000 rpms and shift at 6600 rpms. its a mule and could last forever if i didnt decide to spray it all the time ... Come join the discussion about racing, builds, pro mods, hot rods, events, turbos, nitrous ...What engine did 243 heads come on? The LS6 engine, manufactured between 2001 and 2006, had 243 heads. While it was initially used in the C5 Corvette, it was also adapted to meet the truck specifications of the LQ4 and LQ9 engines. To better suit the working style of these trucks, the 243 heads were given 6cc larger combustion chambers ...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 ...In any event, although the dyno did not show a huge gain, the SOP feel with the heads is serious. The Goat pulls much, much harder, especially above 2600 rpms or so. Ron at Vengeance told me that the as cast typically dyno about 10-12 HP less than the CNCs. 2018 Camaro ZL1 1LE: 649 HP 689 Trq.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 ...Oct 13, 2006 · chevymastermind said: I have a set of Chevy heads with a casting number of 333882, with 1.94 Heads, i am hoping to make 350-375HP with them. the engine is a 350 Steel crank, 4 bolt main, 9.5:1 compression ratio with these heads, comp cams .480/.480 lift with 230/230 Duration at 0.50, 600cfm edelbrock carb, Performer RPM intake, headers …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”.If you are just installing stock heads with no work, forget the 5.3 heads and just get a set of decent 243 heads which will still bump CR up 1/2 point on the LS1 (64cc combustion chambers compared to 66 CR of the 241 heads). 2004 torrid red with red interior A4 GTO (1 of 499)ddawson. 15570 posts · Joined 2004. #4 · Sep 29, 2008. The 317 is a 243 but with a larger CC. I have the 317 on my car with 70CC. 1969 Corvette, 427 Convertible. 496CI Edelbrock Heads, Quickfuel Carb, LS6 Intake. Straub Technologies 229/235 .590/.559 107, Hedman Headers, Magnaflow Exhaust. Speed Direct Rack and Pinion, Semi Coilovers ...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.FED LS1/2/6 Cathedral 243 Stage 2. $ 2,784.96. Beautiful set of 243's are on the shelf and ready to ship. The heads are assembled and complete, no core exchange necessary. Orders placed before 3PM ship same day. FED .700 Lift Dual Spring Kit.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.Getting the right head for your needs requires you to know a little bit more so you can ask the right questions and get the right answer. Component Breakdown Cylinder Head. LS1 engines come with aluminum heads. Parts and features on the head are the intake and exhaust ports, combustion chambers, seats, valves, springs, retainers, keys, and guides.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.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.Head History. The selection list is basically rather thin for today's performance engines. The earliest 265 and 283 small-blocks relied on an iron Power Pack head that featured 58-cc chambers and tiny 1.72/1.50-inch valves. The bigger heads to follow were the "double-hump" heads championed by the mid-'60s 327 engines.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 ...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 …From the customer: 1 7/8 STOCK CAR HEADER, SO WITH A REGULAR 1 7/8 HEADER, TORQUE AND HP WOULD PROBALLY BE A LITTLE BETTER,HEADS ARE 702 ,MILLED TO 96 CC WITH A 0.0028 THOUSATHS COMETIC GASKET (MLS)WITH A QUENCH @0.0040.STOCK VALVE SIZE ,FERREA VALVES ,HARDENED SEALS ON EXHAUST, NO PORTING.10.1 CR. Chris Straub.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 ...706 heads are very affordable. 706 heads are plentiful and easy to find. 706 heads have smaller chambers, so you don't lose compression. 706 heads are slightly superior to 862 heads due to how .... I would think a 243 head is a 243 head, I think I read tThe 243 heads come with 1.7 - ratio rockers responsible for opening an 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 ...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 ... I have a lq9 .020 over, 243 heads, headers, gen 4 intake 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. assembling my ls1 with 243 heads....
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