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.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 ...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.This. I bought 2 sets of top of the line CNC'd 243 heads for around the same price, one from TEA and one from AI. So unless those heads are from a well respected head porter, they are not worth anywhere near that. Not all CNC programs are created equal, and it seems just about anyone with a cutting machine has a CNC program for …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.In 1964, when the solid lifter 327s were increased to 365hp (Holley) and 375hp (FI), the double hump heads got the 2.02/1.6 valves and the 300hp/327s retained the 1.94/1.5 valves (the 250hp base engine got the pyramid heads with 1.72/1.5 valves, no good!). These first "fuelie" heads were 3782461 castings and some 461s got an X added.SW LTs, SW Cat Back, HPE S-Cam, 243 Heads, Patriot Golds, HPE Tuned, Z06 Maf, ASP Pulley, K&N CAI, MTI TB, Bird of Prey Clutch, GMM Ripshift, AMW Catch Can, Harrop Diff Cover, Pedders Subframe Bushings, NGK TR6, MSD Wires, SLP 160 T Stat, RP Trans/Diff Fluids, Mobil 1 10-30, Dual Areoforce Gauges/Banshee Pod. ... Come discuss mods, horsepower ...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.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 ...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.RPO L99 and LS3 cylinder heads are aluminum with 68cc combustion chambers, rectangle intake ports with 257cc runners, D-port exhaust with 87cc runners, 2.165˝ intake valves and 1.590˝ exhaust valves. These heads can be CNC-ported to improve on flow and milled for higher compression. These heads are almost the same, but the L99 heads used a ...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.Aug 11, 2021 · 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.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 ...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.Dec 27, 2022 · 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.The only ones I ever saw were angle plug - the 492 head was available in straight or angle plug. The 492 was the over the counter replacement for the "camel hump" heads. The 292 was indeed the "turbo" head. These heads were used on just about every small block race engine from the 70s to the mid 80s. Popularized by Smokey Yunick and Bill Jenkins.Joined Jul 27, 2005. 1,569 Posts. #37 · Jun 13, 2008. Btw I have a stock set of 243 heads with low miles I will sell for $400. 99 TA Aps Extreme TT kit / Aes 390ci / TRick flow 220 /comp 230/230 cam/ Xtreme 4l80 /circle d 3500 stall / 9in.. 866RWHP/740RWTQ 16 PSI thru a unlocked converter.Ai GM 243 LS2/LS6 Performance Rebuild Cylinder Head Package. Our Performance Rebuild suite of inspection and machine work is a great option for the value minded. Even in as cast form the GM LS cathedral castings are capable of producing impressive power levels. If you are building a budget setup, we can bring the factory head back into better ...Jun 26, 2012 · 2752 posts · Joined 2011. #1 · Jun 25, 2012. Ok, just got my 243`s today. Not my first set of head porting, but it is my first LS set. Im pretty comfortable were im at with them right now. They are at the roughed stage, waiting on my roll kit. I spent $200 on some aluminum specific Snap On burs and boy to they work fantastic.The 243 heads do flow better but that can be overcome with larger valves in the 5.3 heads. A set of CNC'd 243 heads will still set you back about the same $$ or a little more than the equal 5.3 heads. ... Racing gas will come into play any higher than that, though. I would definitely recommend a cam with a lot of overlap to help bleed off a bit ...823 vs 243 heads The popular L6 243 heads have a smaller capacity (64cc), whereas the 823’s larger intake valve has a 70cc cylinder, promoting better overall flow within the combustion chamber. In addition, there’s some controversy among gearheads about whether the “swirl” ramp added to the 243 to improve fuel and air mix in the ...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.Dec 22, 2017 · In terms of cylinder heads, we included the 706 small-valve 5.3L heads, the 241 (LS1), 317 (6.0L truck), and 799 (as a stand-in for the hallowed 243) heads. The idea was to flow and measure each ...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.assembling my ls1 with 243 heads.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 ...Item description from the seller. GM LS2 LS6 Gen III Gen IV Cylinder Head 243 Assembly Set OEM. These heads must be resurfaced before installation. Machine cleaned and inspected for cracks and damage before shipment. Heads may have been previously remanufacture / resurfaced. Valves may be oversized. Additional Details: Genuine OEM.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 …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.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 …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 111The 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 ...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.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 ...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 tunedDid 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.Jun 21, 2007 · Spring must come completely out. You must pressureize the cylinder through the spark plug holes to hold the valve up. Compress the spring, remove the locks and retainer, remove the spring. The seal will pop out using a pick or very small screwdriver. Pick works best. Pop in the new seal. Replace everything.LT engines were producing an output of 275 horsepower, and its successor, LS1 243 heads came with a whopping power of 345 horsepower. ... LS1 engines come with reduced proportions, and this makes it much easier to swap into vehicles even with a small engine base. They get this compact size due to the old-school pushrod design that is …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 ...12,557. The heads also bump the compression from 10:1 to 10.5:1 (stock for stock),,,,since they are milled (depending on how much) the compression should be even a tad higher than that. I'm sure the better exhaust side on those LS6 heads helped as well. Pretty interesting results for sure. 10-29-2010, 01:58 PM #5.will these valve springs work with 243 heads. Jump to Latest Follow ... (235/240-.646.609), CNC'ed Heads, Yank SS 3800 Stall, Custom K&N CAI, Dyno Tuned (#'s To Come Soon) "Traction Is A Bitch. Save Share. Like. Sort by Oldest first Oldest first Newest first Most reactions.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 ...In 1964, when the solid lifter 327s were increased to 365hp (Holley) and 375hp (FI), the double hump heads got the 2.02/1.6 valves and the 300hp/327s retained the 1.94/1.5 valves (the 250hp base engine got the pyramid heads with 1.72/1.5 valves, no good!). These first "fuelie" heads were 3782461 castings and some 461s got an X added.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.GM LS6 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 ... I'll give ya threefiddy, a jar of Vegemite and a box of boomerangs that may or may not come back. -- Olly.Google can help you figure out where bitcoin's price is headed. Bitcoin’s skyrocketing price is showing no signs of slowing. It’s currently trading for over $4,100 a coin, having b...I believe that any 5.4L sohc motor has the P.I. heads on them. Flip. 1997 GT, 5-speed, Lazer red with Gray leather. Headswapped and Bullitt intaked 4.6L SOHC (Everything but the bottom end and a power adder), MM Road and Track box (except for Steeda CC plates, no 4 pt lower chassis brace due to long tubes, Cobra STB and Kenny Brown double cross ...The 806 heads are literally 1st gen heads, have a perimeter bolt pattern for the valve cover. Which means you need that cover and IIRC the coil packs bolt directly on the cover vs a bracket that holds the packs together. Flow is meh even when ported. You should look for 317 or 243/799 heads with the emphasis on the later for NA builds, if going ...51 posts · Joined 2011. #1 · Feb 22, 2012. Are the 5.7L 243 Casting Number Cylinder heads Direct Bolt on for a 4.8/5.3? StrokerAce03;5114860 said: Basically its just a bastardization of parts to create an oversquare engine that should scream at high rpm and rev to the moon. BE DIFFERENT.We would like to show you a description here but the site won’t allow us.243's are extremely capable of good gains when CNC'd...I still use them right now. 2005 GTO QSM, 418" NaturallyAspirated ,Bullet Racing cam, 243 heads, 6speed, Kooks 1-3/4" headers w/cats ,matchported FAST 102,NW 102mm, 3.73 gears PB in 1/8th 7.76@97 on Firestones with 1.97 60'. Tick Performance tuned. 522 RWHP/501 RWTQ.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.A properly ported set of 243 heads, and more compression really help. 2004 GTO Phantom Black M6 06 Brake setup, Maverick coil overs, Hawk HPS pads, BFG Comp2s, AI 243 heads, Ghost cam, TPiS LS6 90mm TB mount, UDP, Svede1212 OTRCAI, Kooks Signature Series LTs with cats, Gforce anti-hop axle, SAP grilles/fascia, Banshee hood ... Come discuss mods ...The LS4 is a 4th gen, 5.3 l aluminum small block engine that was used in GM cars between 2005 and 2009. They had cathedral port cylinder heads and used Active Fuel Management (AFM). The LS4 cylinder heads came with two casting series numbers - 799 and 243. The combustion chamber volume is 65cc.My truck is a 2000 gmc 2500 2wd sclb not hd and has 3.73. It is bone stock with 175k and runs great. I just got a set of 243 heads of of a gto, also have cam litters and pushrods. My plan is those heads from what I here will get me at 10.2 to 1 longtube headers no cats, but not sure what to do about the cam or intake yet. The big thing is I don't want to buy a torque converter for it.07-16-2007, 08:03 PM. # 2. Y2Kvert4me. Race Director. Member Since: Oct 2002. Location: Gone. Posts: 16,477. Likes: 0. Received 18 Likes on 15 Posts. CI 6-7-8-9-10 Veteran. St. …Rick@Livernois said: As others have stated, the 243 head would be a step backwards as the L76 uses the same head as a L92/LS3. Our "B" cams are typically used for forced induction. Larger displacement engines will "eat up" the camshaft and actually make it sound much more tame than a stock displacement engine with the same cam.The 243 heads, being performance-oriented and made of aluminum, tend to come with a higher price tag. Consider your budget and intended use when making a choice. Modifications and Customization. If you're a gearhead who loves to customize and modify your engine, the 243 heads offer more room for improvement.Last updated on 05/06/2024. The LC9 engine is a 5.3L, Gen. 4, aluminum small block engine used in GM trucks and SUVs between 2007-2011. For marketing purposes, it was also known as the Vortec 5300. The engine specs and information listed here is for a stock LC9 engine. Mechanically similar, General Motors’ LS and LS-based …The LS2 heads wich is the same as the LS6 head has a casting number of 243. Problem is that some of the LS2 have heads with a casting number "799" truck heads, wrong head!!!:weird: I have checked mine and it has the 243 castings.:thumbsup: A vette owner dynoed his vette with some mods and only pulled 345!!! So far 5 07 vettes have this head :duh:Same heads. 243/799 castings. But the LS6 (Z06) had hollow intake and sodium filled exhaust valves. Believe that is the valve arrangement. Either way, they had lighter valves. I went with a set of 243 heads off an 08' 5.3L truck engine. Sent them to Advanced Induction for their cnc magic. Get the set off the LS2.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 ...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.Dec 9, 2012 · 243's are extremely capable of good gains when CNC'd...I still use them right now. 2005 GTO QSM, 418" NaturallyAspirated ,Bullet Racing cam, 243 heads, 6speed, Kooks 1-3/4" headers w/cats ,matchported FAST 102,NW 102mm, 3.73 gears PB in 1/8th 7.76@97 on Firestones with 1.97 60'. Tick Performance tuned. 522 RWHP/501 RWTQ.Intake and Exhaust Ports. The intake and exhaust ports on the 243 heads are larger than those on the 799 heads, which allows for more air and fuel to enter the engine. This can result in higher horsepower and torque output. However, the smaller ports on the 799 heads can provide better velocity and airflow at lower RPMs, which can be beneficial ...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.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 ...Nov 9, 2009 · All 5.3L NNBS motors either came with the 799 or 243 heads and flat top pistons. REMEMBER--just because the heads say '243' doesn't mean it has the lighter weight valves and upgraded valvetrain like the 243 heads that were on the Z06 Corvette. Any 799 or 243 head found on a truck had the regular valvetrain.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 ...Aside from the casting number, they have distinctive D-shaped exhaust ports. 243 castings are harder to come across and are sometimes called LS2 heads. On the truck side, these would be 035 or 317 ...I'm always for more cubes. But, if the 5.3 is solid otherwise, and you don't need the little extra power and/or don't wanna spend the money for the 6.0 swap, then fix the 5.3. You can do small easy things to the 5.3 to match or exceed the 6.0's power and maybe still come out cheaper, depending on the cost and condition of the 6.0 in question.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 impressive 317 cfm.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.My question of anybody running a stock ls1 cam and 243 heads and did they see any difference with them.I read there was 29 hp gain with in a article. I was thinking about trying a pair before I do a cam in my car.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 ...get those projects done! should you run 706 heads on your 6.0l for more torque? what about the change in compression and detonation? what if i have to retard...The Gen III block can be iron or aluminum, and you will see 4.8/5.3L cast into the front of the block. Both the 4.8L and 5.3L have the same bore yet different strokes. The 4.8L has a 3.27-inch ...The 862 heads are inferior to the 706 heads in terms of compression, and they don’t also flow well like the 243 heads because it doesn’t have other competitive features; however, depending on your car’s needs and budget, the 862 cylinder heads might be a good port for you.Manish Maheshwari, the former head of Twitter India who recently moved to San Francisco to work at a different division within the company, is leaving the firm to launch an edtech ...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.706 heads, also known as "706 cylinder heads," are a specific type of cylinder heads commonly used in engines produced by General Motors (GM), specifically in their LS series. These cylinder heads are quite popular among engine enthusiasts due to their compatibility and desirable features. The name "706" comes from the casting number ...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.The L33 is a 5.3L, Gen. 3 small block engine used in GM trucks between 2005 and 2007. Although it is a truck engine, 241 was used on 01-04 LS1 engines. They both have a 66.67 cc combus, Jul 29, 2006 · I think that the NGK TR5, What did LS 243 heads come on? The 243 head came on the more powerful LS6 engine from 2001 to 2006, and was used, Heads/Cam/Intake Manifold/Internals ..., oil catch can, Pacesetters LT Headers,3500 Stall, K&N CA, bmr drag bags. We can port an, Way I would go about it, is to remove your heads and measure your piston above deck height first. Then select the hea, The casting numbers and heads you want for the Z28, The 862 heads are inferior to the 706 heads in terms of compression, Rick@Livernois said: As others have stated, the 243 head would be a s, 431 posts · Joined 2019. #9 · Jan 5, 2021. 706 head, Dec 22, 2017 · In terms of cylinder heads, we included the , Sep 28, 2011 · I would think a 243 head is a 243 h, ported 243s, ls2 stock shorty + cam. procharged. 740~whp. That soun, Auto Parts Blog. 243 heads: 243 heads specs that make it spe, I did some extentsive searching for on 305 vortec heads and found , , The LQ4 is a 6.0L LS (Gen. 3) small block engine used in GM tru.