What did 243 heads come on

Aug 15, 2006 · I know the cam is .525 on both sides.

2002 Camaro Z/28 Pewter. Originally Posted by 98TransAmWs-6. Here are the differences: 243 heads came with 2.00 hollow stem intake valves (lighter) and 799 heads came with regular solid 2.00 intake valves. 243 came with sodiom filled stem 1.55 exhaust valves (lighter and more heat dissepation) and 799 came with regular solid stem 1.55.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.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...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...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.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.Run with the 317 heads, the modified 5.3L produced 448 hp at 6,800 rpm and 398 lb-ft of torque at 5,000 rpm. After installation of the 706 heads, the power jumped to 468 hp at 6,800 rpm and 413 lb ...Apr 26, 2018 · If you’re gonna do a L33 swap into anything you may may as well leave the 799/243 heads that come one it. Yes I have seen L33s with a 799 on one side and a ls6’s 243 casting on the other from the factory. There is no reason to put the weaker 862 head on an L33 when the engine comes with the best flowing cathedral port heads GM made.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.Unfortunately I cannot tell you what motor they come on but try and find a set of the 799's. They are the same as the LS6 243 castings without the sodium filled valves. Still 61.15cc chambers but 2" intake valves. ... I know 243 and 799 heads on 5.3 is a popular swap, but never thought about shrouding issues. Either way, still an improvment ...What did LS 862 heads come on? It is no wonder that the 862 heads are so popular among General Motors' LM7 engine owners , for these cylinder heads pack plenty of power and a great design. Crafted from aluminum with a 61cc combustion chamber volume , these cylinder heads feature a cathedral-shaped intake port and an oval exhaust port .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 …In a comparison of the cammed 243 head and the cammed rectangle-port LS3 head, the LS3 torque peaks at 456 lb-ft (4,800 rpm) while the 243 head madeat leastthat much torque from 3,500 rpm all the ...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.Trucks often come with mechanical fans that sap horsepower. An electric fan kit will free up the power. All these can be done in the garage, but the tune won't be optimized. ... Lee, a lot of ls enthusiast with Lm7's seem to think the 243 heads are the best bang for the buck but couldn't be further from the truth. The stock bore is only 3 ...assembling my ls1 with 243 heads.The heads in question (5364) heads also came on the Gen IV truck 6.0 07+ (LY6), so you should have no problems getting them to fit. You'll need heads bolts for pre-04 gen III engines (later engines stop using the longest bolts) You'll need an LS3 intake to get your desired lower profile intake. racinnut15xm. Pro.Aug 15, 2006 · I know the cam is .525 on both sides, but how much lift can the stock valve springs take on stock 243 heads? I think you're limited to around .550 with the LS6 springs. A lot of guys go to 918 springs with mild camshafts like the GT2-3. Doing the math on a 1.8 rocker makes it .554 lift.I was thinking more along the lines of a ported 243 casting with a fast 90 (i figure at least $3300 for the whole kit and kabootle) figuring 2K (lets use livernois stage 3R's for pricing purposes) for the heads and 1300 for a ported fast. I havnt seen many guys go with a setup quite like this so im not sure what the powerband will look like ...As stated above they are the same as 243 heads with a different casting method. They should have 64cc chambers. Save Share. ... The rest use the same standard LS valve thats come out in LS1's and 6.0's for years. 64.45cc chambers for 799/243 71.06cc chambers for 317 5.3 castings were 61.xx ccThe LQ9 is a 6.0L Gen. 3 small block engine used in GM trucks between 2002 and 2007. For marketing purposes, it was also known as the Vortec HO 6000 or VortecMAX. The information listed here is for the stock engine. Mechanically similar, General Motors' LS and LS-based Vortec engines wound up on almost every branch of the GM family tree ...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.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.Part#: ALL-65056NPC. Condition: NEW - Aftermarket. Manufacturer: Allied Motor Parts. Year Range: 97-04. Engine Size: 5.7L - 350ci - V8. Description: CNC Ported LS1/LS6 243/799 Style Cyl Heads .650 Springs 2.02/1.59 Valves PAIR. Discover a variety of Cylinder head collection to cater to your vehicle's specific requirements.The 317 heads featured ports that all but duplicated the LS2 243 heads, meaning they were cream of the cathedral-port crop in terms of airflow. The 317s did differ from the 243s in that they featured much larger (and less efficient) combustion chambers. Where the stock 243 heads featured 65cc chambers, the 317 heads featured 72 cc chambers.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...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 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.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.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 …GM Engine & Exhaust Performance - lm7 with 243 heads - hey, I am new here and have been looking at some of the posts. I am going to be pulling the heads on my 03 sierra 5.3 lm7 and was considering putting on some 243 heads with a .040 cometic gasket to bring the compression to 9.8. my concern was with torque, I use...The cost? Too much for the bang. If I didn't care about maintaining a stock-looking engine bay (painfully stock), I would go with AFR heads. Stock LS6:243 heads aren't worth purchasing (new) - IMHO. You CAN find stock LS2:243 heads in new condition for a very low price (~$600/pair). The difference is in the valves (LS6 valves are …05 LS2. I know the cam is .525 on both sides, but how much lift can the stock valve springs take on stock 243 heads? I think you're limited to around .550 with the LS6 springs. A lot of guys go to 918 springs with mild camshafts like the GT2-3. Doing the math on a 1.8 rocker makes it .554 lift.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.Sep 29, 2008 · 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 ...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 ...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.Feb 21, 2018 · Chevrolet LS rectangle port heads need at least 4.00 bore. 5.3 and 4.8 are 3.78". LS7 heads require even larger. All 4.8s, 5.3s, and 5.7s came with cathedral port heads. Like mentioned, the square port heads were not put on any engine with a bore smaller than 4”.The 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 …Apr 28, 2013 · 2004 GTO M6, 243 heads, 224/228 TSP cam, Svede intake, JBA Shorty's Catless Mids 383HP/376TQ Whiteline RR bushings, Rear Sub frame, Diff inset and trans insert. Save Share. Like. ... Come discuss mods, horsepower, engine specs and more! Show Less . Full Forum Listing. Explore Our Forums.05 LS2. I know the cam is .525 on both sides, but how much lift can the stock valve springs take on stock 243 heads? I think you're limited to around .550 with the LS6 springs. A lot of guys go to 918 springs with mild camshafts like the GT2-3. Doing the math on a 1.8 rocker makes it .554 lift.

Compression Ratio Calculator - Wallace Racing. 3.622" x 4.00" / 6.098 rod length / 9.240 deck ht. / 0.008" out the hole / 0.052 gasket / -6.7 cc dish / 4.000" head gasket bore / and either 71.06cc for 317 or 64.45cc for 243's. Note if you do run 243's on the LQ4, the piston raised ring around the dish has been known to interfere with the ...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.Once you receive the new ported heads, just send us your OEM heads for the core refund. Available options: (Porting Service) GPI - LS1 Cylinder Head Porting Service. $ 1,095.00. (Purchase Outright) GPI - LS1 Cylinder Head Porting Service + OEM LS1 Cylinder Head Set Core. $ 1,795.00. Your selection: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.
Feb 20, 2010 · A_VAS. 4684 posts · Joined.

Jun 2, 2023 · For example, Corvette Z06 came with 243 heads featuring sodium exhaust valves – typical for the L6 engine. In all other gens, though, even the valves would be the same, made from stainless steel. Spotlight. 799 Heads (Re-manufactured) Disassembled, properly cleaned out, and fully inspected for casting integrity.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.Update on 601 heads on 350. I finally got the last of the tuning issues cleared up, and the 601 heads are working great. The history of the project is in another thread in the Engine section, but the upshot is they are doing everything I wanted. I had 200 CC IEs on it and switched to these, the smaller ports and chambers give me tons of low end ...Did the 317 heads come on the 6.0 liters, and/ or would they be a good casting head for the stock LS1? or would the Cnc'ed 243's be better? thanks for everyone's advice!Join Date. Nov 2008. Location. Spring, TX. Posts. 2,228. 243 heads are the same as 799 heads which are found on the LS2's, same block as LQ9. you will need to match your valvetrain to your cam. i dont foresee any ptv clearance issues but you need to make sure you have the right valvetrain. Skeet is running a similar duration cam with his 243's ...Nov 12, 2009 · ported 243s, ls2 stock shorty + cam. procharged. 740~whp. That sounds healthy. If I can pull off 700 rwhp like that through my A4 for the time being with 234's or 317's I think I'll be satisfied. SOFAKINGGR8 said: Numbers in sig, recently made over 700whp a few weeks ago, and have been over 600whp since April.The cam used was a 231/231 (LSL lobes) on a 114+2. No ported 243 head at 1500 will get you much over 470rwhp and even that will be with a huge cam that most wouldnt want to live with. A Trick Flow 225 with a mid 230's cam has the H/C 1/4 mile record in an LS2 and it isnt a crazy overlap cam.With the above heads, the peak flow was reduced to around 260 cfm from 298 cfm at .600" lift. This is important as the head and Manifold work together, giving a more realistic indication of the potential horsepower to be gained. The head may flow 320 cfm, but with a stock intake bolted up, you can loose 50-60 cfm of peak flow.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 ...(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...We added a set of Stock 243 heads to my LS1. Picked up 29 rwhp from stock LS1 heads. Previous dyno on Dynojet was 385rwhp. Present dyno is 414rwhp and 366 rwtq. I am very pleased with this addition at this time. Mods in Sig.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.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 ...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.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.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 ...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...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.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.