Aug 6, 2020 · The 243's have bigger valves which do better on 4.0" and larger bores. On the smaller 3.898/3.78" bores of the LS1/6 & all 5.3/4.8's the 706 are very decent. On a 4.00" bore of an LQ4 though it is splitting hairs. On the same cam, on the same engine, the heads are going to perform within +/- 5hp/5tq of each other, it is almost meaningless.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 …Since then, the lampshade on the head has come to symbolize the obnoxious drunk trying to be funny—and failing. In 1938, a columnist described alcoholic actor John Barrymore as "at any moment ...The depth of the Columbia River ranges from 20 feet to 170 feet at various points along its route, and its total length is 1,243 miles. Locks, dams and reservoirs built on the Colu...For instance, the 799 cylinder heads come with a smaller combustion chamber than its counterparts. So porting to 799 LS heads would mean milling the cylinder heads to cover up for the bigger size of the former combustion chamber. ... Chevy Cylinder Head LS1/LS6 243/799 - PAIR, Year:97-04. NEW CNC Ported LS1/LS6 Cylinder Heads .650 Springs 2.02 ...The article said they also did a test with the LS6 243 heads, but since the 5.3 lost CR it also lost power, but that if you milled the heads to keep the stock 5.3L CR there is probably another 15-20 horse in the 243 heads, which is enough to put an otherwise stock 5.3 well over 400 Horses.For instance, the 799 cylinder heads come with a smaller combustion chamber than its counterparts. So porting to 799 LS heads would mean milling the cylinder heads to cover up for the bigger size of the former combustion chamber. Material Make. The 799 heads have an aluminum build that can withstand high temperatures. Aluminum is a good ...Sierra Pro-hunter. Based on the parent .308 Winchester case, the .243 first appeared in 1955 in Winchester's model 70 bolt-action. It was envisioned as a "dual-purpose" cartridge, highly useful for both varmints and medium game. Remington more or less concurrently brought out the .244 Remington in their model 722 bolt-action gun.The 2015 F-150 Ford truck standard dimensions are 243.7 by 96.8 by 75.7 inches in length, width and height respectively. The width measurement includes the length of the truck’s si...Here's my thinking. The 243 has. 2.00 intake and 1.55 exhaust with a 65cc combustion chamber. The 706 has. 1.89 intake and 1.55 exhaust with a 61cc combustion chamber. If I have a set of 2.00 intake valves put in the 706 with the smaller combustion chamber wouldn't I have a better head with more compression and that's not counting if I ...Sep 26, 2019 · Unless your building something something over 7000rpm an OEM head is the way to go. People routinely get 1000hp out of them. On 4.8, 5.3, 5.7, NA 6.0 - I always recommend the 243. Maybe even milled a touch if needed. On 6.0+ the 823 variant of the rectangular head is great. 65 Chevelle Malibu 2dr HT LS Swapped.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.243 SS heads on a 4th gen 5.7. Jump to Latest Follow 2K views 8 replies 5 participants last post by ssprince Feb 10, 2013. B ...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 243 heads were installed on the LS engine, which was produced from 2001 to 2006. It was formerly used in the C5 Corvette but has now been ported to the …Jparr97 said: I have a 2004 vz ss ls1 6sp man, the engine has the 241 heads on it and I was wondering if the 243 heads would fit, if so what do I need and is it worth the upgrade. Car is currently making 253.5 RWKW what kind of gains would I be looking at. From memory yes they will fit but gains are not too much.Aug 18, 2011 · 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.Imogen Daepo 08/17/15. The question: Where did the term "Potterhead" come from? I've been wondering just now why Harry Potter fans are called Potterheads. Who made up this term? How do you think it became popular? We could have been called "Potterfreaks" or even "Harried" (something like the word married with the word Harry in it), but why ...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 ...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.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.Find Parts and Accessories 243 cylinder heads KEYWORD and get Free Shipping on Orders Over $109 at Summit Racing! Use your Summit Racing SpeedCard today, and get 15% back - Get Details! ... Top-End Combo, PowerPort®, Heads, Track Heat® Intake, Track Max® Camshaft, Big Block Mopar, Chrysler 440, Kit. Part Number: TFS-K616-620-576. Not Yet ...C5 Tech - LS6 valves vs stainless aftermarket in 243 heads - Curious if you guys running 243 heads keep the stock valves or replace them with aftermarket that might help flow. Looking to pick up a set of 243 heads needing hardware and work them over myself. I imagine the LS6 valves are not undercut like the stainless...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.Some General Motors vehicles, specifically those built between 2001 and 2006, come with the LS6 engine that comes equipped with 243 heads. This includes the 5.3 and 4.8 models, which are generally outfitted with these factory-designed 243 heads now. To check if the 5.3 is equipped with 243 heads, look for a three-digit stamping near the valve ...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.The L76—like its LS2 sibling—is a 6.0L, Gen. 4, aluminum small block engine that was used both in GM cars and trucks. The L76 is an adapted version of the LS2, featuring new rectangle port cylinder heads and Active Fuel Management (AFM). The L76 was available in the Pontiac G8 GT from 2007-09. It was also used in some …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.Here's my thinking. The 243 has. 2.00 intake and 1.55 exhaust with a 65cc combustion chamber. The 706 has. 1.89 intake and 1.55 exhaust with a 61cc combustion chamber. If I have a set of 2.00 intake valves put in the 706 with the smaller combustion chamber wouldn't I have a better head with more compression and that's not counting if I ...Nov 15, 2022 · This is a SET OF 2 Remanufactured OE Stock LS2, LS6, 4.8L , 5.3L, 5.7L, 6.0L Gen III / Gen IV Cylinder Heads Assemblies. * Part # : 799 also fits 243 casting * Description : Stock LS Series 4.8L / 5.3L, 5.7L / 6.0L * Specs : Combustion Chamber Volume: 64.45cc Intake Port Volume: 210cc Exhaust Port Volume: 75cc Intake Valve …The 243 heads are a type of LS cylinder heads that were originally used in the 2001-2004 LS6 engine. These heads are known for their high-flow intake and exhaust ports, which allow for improved performance and efficiency. Today, 243 heads are a popular choice for those looking to upgrade their LS engine's performance.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 ...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.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 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.Trick flow 228/230, K&N CAI, Beehive Springs,Hardened 7.4 length Push rods,Spintech Catback Exhaust. The rest of the car has stock manifolds,stock intake,stock cats,stock 241 heads. I pass smog and put 365 to the wheels and 352 pounds of torque. I have a simple set up and I will be installing AI 243 heads and shorty Headers with in this month.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 ...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..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.Head gasket repairs can be expensive, but the cost can vary significantly depending on the cause of the issue and the type of repair needed. Knowing what factors impact the cost of...Oct 14, 2019 · I did a 408 cube ls using a cathedral port head. It was the 243 casting, but I don't think there is a big difference in potential. It made good power for a pump gas street engine. Had 10.7/1 comp, 243/258/110 comp cam with .625" ish lift. sv intake, 243 heads ported reasonably well with 2.02" 1.56" valves 50* seats, whitener 4150 carb.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...My car is an ls2 of course, but with stock injectors, fuel pump, and stock catback exhaust, and with stage 2 ported intake, tb,hpe 243 heads, megadeath cam, and slp underdrive pulley with lpe cai did 450 rwhp. The injectors were at 124 percent duty cycle, and we were losing fuel pressure above 6300 rpm.806 is the casting # of the heads . Its on the front corner . 806 is the worse flowing LS1 head and has perimeter valve cover bolts .They came stock on the 98-99 F bodys . 241's are a little better . I believe they came on 00-02 . 243's are the best of the 3 . 243's in stock , untouched form will add @ 20-25 RWHP over 806's and 241's.431 posts · Joined 2019. #9 · Jan 5, 2021. 706 heads out perform all others on a 4.8. Throughout the entire normal rpm range. It's not all just about flow. Those larger flow numbers from other heads are misleading. Yes they flow more than 706 however, only beyond 6000rpm. 706 heads are the best for the 4.8.Which LS engines have 243 heads? The LS6 engines from 2001-2006 have 243 heads. The LS motor with 243 heads is more powerful and efficient. GM’s 243 heads were typically found in C5 Corvette and later on engines like truck specs LQ4 and LQ9. How much Horsepower (HP) is added by 243 heads? … See moreEven 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 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.The depth of the Columbia River ranges from 20 feet to 170 feet at various points along its route, and its total length is 1,243 miles. Locks, dams and reservoirs built on the Colu...The 5.7L LS6 is the most powerful Gen. 3 small block engine as it came from the factory. It is an improved version of the LS1 produced for the 2001 Z06 Corvette. The LS6 powered the 2001-04 Corvette Z06 and the 2004-05 Cadillac CTS-V. Mechanically similar, General Motors' LS and LS-based Vortec engines wound up on almost every branch of the ...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 ...French fuel workers entered a 15th day of strike action on Wednesday, leaving more than a quarter of gas stations without at least one type of fuel. Americans heading to France thi...Unless your building something something over 7000rpm an OEM head is the way to go. People routinely get 1000hp out of them. On 4.8, 5.3, 5.7, NA 6.0 - I always recommend the 243. Maybe even milled a touch if needed. On 6.0+ the 823 variant of the rectangular head is great. 65 Chevelle Malibu 2dr HT LS Swapped.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 ...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.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.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...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.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 ...7477 posts · Joined 2005. #2 · Jun 22, 2012. A stock pair of 243 heads can gain about 20 hp on a bolt-on LS1. Since you already have a cam, you might see a bit more. If your budget does not allow a full porting job, don't sweat it, just swapping to 243 alone will be a big help.Just started taking the springs and stuff of my 990's today, they are a pretty good head out of the box but with a little cleaning up in bowl area and adding a 2.25 intake valve the 990's become a great head. I had a set of 188's looked the same as the 990's, did not need both sets so I sold the 188's. L-29 461 BBC 11.10@118mph 9-30-22.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 …Head gaskets are essential components of an engine, and when they fail, it can be a costly repair. Knowing the cost of head gasket repairs can help you budget for the repair and ma...LSX3rdGen. The 241 head is a stock ls1 head it was on the f bodys and also on the ls1 vettes. They were produced between 2000 and 2003. they are the same as the 853, the 853 was made from 1997 to 2000. ls6 heads are 243's.2792 posts · Joined 2007. #6 · Jul 22, 2008. The LS4 (FWD 5.3L) comes stock with 243 heads and it has the same bore and stroke of the truck engine, so I don't see why not. He's going to lose some compression though. 243's have 64cc chambers, while stock 5.3L heads have 61-62cc chambers IIRC. 2009 G8 GT A6.Did the 5.3 come with 243 heads? Of course, today’s 5.3 and 4.8 both have 243 heads that are factory-designed. 243 heads were included in the LS6 engine produced between …LS1 LS6 243 / 799 Aluminum Cylinder Head CNC Porting Service ( Customer Supplied Bare Heads ) CNC Ported LS1 243 / 799 Cylinder Heads, Customer Supplied Bare Casting heads. $599.95. Options. Valve Job with new Valve Guides + $400.00. Resurface for MLS Gaskets + $150.00. Cylinder head Assembly + $150.00.Mar 11, 2023 · 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 ...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 heads even have fancy hollow-stem …C5 Tech - LS6 valves vs stainless aftermarket in 243 heads - Curious if you guys running 243 heads keep the stock valves or replace them with aftermarket that might help flow. Looking to pick up a set of 243 heads needing hardware and work them over myself. I imagine the LS6 valves are not undercut like the stainless...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...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.Last updated on 05/06/2024. The L92 is a 6.2L, Gen. 4, small block engine used in GM luxury trucks and SUVs between 2007 and 2008. For marketing purposes, it was also known as the Vortec 6200. The information listed here is for a stock L92 engine. Mechanically similar, General Motors' LS and LS-based Vortec engines wound up on almost every ...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 ...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.Definitely to maintain low end response and torque,stick with cathedrals. LS3 heads and hears why, ls2 l92 heads makes 460rwhp 446rwtq. Over 450Hp, and a fairly broad and flat torque curve with a mid sized cam, and a set of heads that you can assemble with good springs for about $1000. Originally Posted by Rtzracer.For instance, the 799 cylinder heads come with a smaller combustion chamber than its counterparts. So porting to 799 LS heads would mean milling the cylinder heads to cover up for the bigger size of the former combustion chamber. ... Chevy Cylinder Head LS1/LS6 243/799 - PAIR, Year:97-04. NEW CNC Ported LS1/LS6 Cylinder Heads .650 Springs 2.02 ...Receive notifications when cylinder heads are in stock and ready to ship. First ... Leave this field empty if you're human: 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 ... o Valve Guide Clearance – Your FED Heads come with proper guide clearance for ...PRC 2.5 243 heads. Jump to Latest ... (ultimate cross), VRX3 cam (226/228 .585/.588 114+4), PRC 225 as-cast heads milled to 60cc, 102 fast intake, Ported stock TB, UDP pulley, 4L65e level 5 with HD shift kit and FTI 3200 stall. Tuned by Synergy Motorsports....440HP/433lb Dynapack ... Come discuss mods, horsepower, engine specs and more! Show ...I just went through this. I put ls2 243 on my 04. The only way to be sure is to look at the head bolts you currently have when you take them out and buy the exact same ones. The change was in Jan of 04 but your motor might have been made before that as mine was so I have the longer head bolts.. GM LS6 CYLINDER HEADS CASTING #243 ONLY REBUILT STOCK HEADS. THIS SThe 243 Winchester Super Short Magnum or 241 vs 243 the 243 is a better head. Ported vs Ported the 243 is a better head. The AFR heads are 205CC intake runners. They do this to keep velocity up. Many porters go larger then this "225+" which can effect you TQ curve at lower RPM's. I'm using a set of 317's with 225CC intake runners that flow 310 at .6000.2007 head issues #243 vs. #799. I read a thread not long ago on C6 general about a difference in the heads on the born in Oct. 06 C6's that GM used, they used #799 heads as opposed to #243 heads. The person who wrote the thread said his numbers on the dyno where significantly off from other vettes tested. They said there was a difference in the ... 799 Vs 243 Heads: Specification Comparison T Sep 6, 2017 · 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 ...2792 posts · Joined 2007. #6 · Jul 22, 2008. The LS4 (FWD 5.3L) comes stock with 243 heads and it has the same bore and stroke of the truck engine, so I don't see why not. He's going to lose some compression though. 243's have 64cc chambers, while stock 5.3L heads have 61-62cc chambers IIRC. 2009 G8 GT A6. The L33 engine with VIN code "B" is ...
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