Received 53 Likes on 47 Posts. Only difference between the 799 and 243 heads is the process in manufacturing. The 799 heads were formed in a sand process so the ports can be a bit rough compared to the 243 heads. If porting its a non-issue. Otherwise, everything is the same.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 ...234-4317 is for 2004 models, it has same length bolts. 234-4316 and 234-4110 are the one's you want to chose from. The only difference between these two are that 234-4110 has Hex heads and 234-4316 has 12-point heads. So basically chose the Nut style you want. Its $30 more for 12-point heads.I had a close friend of mine hand port my 243 heads. After a re tune I ended up with about 25whp and 30wtq out of them. Im really happy with the results! Save Share. Like. ... I’ll give ya threefiddy, a jar of Vegemite and a box of boomerangs that may or may not come back. -- Olly.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 ...Jan 18, 2018 · The 243/799 heads made more power than the 317's in back to back N/A, and boosted, dyno pulls on the same motor. Sounds to me like you've already convinced yourself the 317 is the better head, so I'm not sure why your on here asking. Besides, from your post, headers are too small, so the head choice may be irrelevant.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 ...This listing is for a rebuilt GM 5.3 liter V-8 cylinder head. 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. Guides and seats have been replaced as needed. New VITON valve stem seals have been installed. All heads are given a valve job. All valves have been ...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 ...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 with ...Mar 9, 2021 · 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.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.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.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.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.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 ...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 …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.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 ...No modifications to do a head swap, but if both are stock untouched heads the 241s have a 66cc chamber versus the 243s 64.5cc chamber. A slight bump in compression, but it shouldn't be an issue. I believe after 07, all 5.3 engines have 243 heads. Now that you're swapping heads, you should consider getting them ported beforehand. KerryAre you looking for a rental property near you? Finding the right place can be a daunting task, but with the right resources and information, you can get a head start on your searc...the LS6 243 heads have the hollow Intake and Sodium filled exhaust valves for higher RPM use. 7000 rpm Reply Like. 05-01-2012, 11:59 AM #4 chassed. Melting Slicks . Member Since: May 2009. Location: Rio Rancho New Mexico. Posts: 3,123 Likes: 343 Received 281 Likes on ...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.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.Up for sale is a set of stage 2 Livernois 243 heads ready to bolt on and go. They where not used very long under 2000 miles.. ... Come discuss mods, horsepower, engine specs and more! Show Less . Full Forum Listing. Explore Our Forums. South East Appearance/Detailing LS1/LS2 Engine Tech North East Texas. Top Contributors this Month706 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 ...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.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 …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 ...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 ...7477 posts · Joined 2005. #5 · Jul 14, 2010. The .040" Cometic gaskets will raise compression ratio, not lower it. That said, the GM MLS gaskets seal up the best and are a decent price. I got mine from Texas Speed. Get the LS1 gaskets that are 3.910" bore diameters. That's what I used and I have no problems.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 ...We may earn a commission for products purchased through links on this pageFeb 13, 2020 · 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 ...11. May 6, 2012. #4. Re: .243 case head separation. "I always just bump the shoulder back." IME, no bottleneck cartridge is any more likely to stretch enough to cause a head seperation than any other. Agree with Wade, you're likely 'just bumped the shoulder back' too far; that's the primary cause of head seperations. T.Realistic Capabilities of LC9 5.3. Ill go on and say im very, very inexperienced with LS stuff. I just snagged a 08 LC9 aluminum block 5.3 for dirt cheap. It has a bad crank (spun rod bearing), 243 heads, truck manifold.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.The good thing about the 416 head is the small chamber for the small bore engines, but don't be fooled, these heads will not make nearly the power a Vortec head will. With the 416 head on a 350, they work well with a 1.94 valve, with the chamber opened to unshroud the valve and a smaller cam in the 220 duration at .050 range.Easier to replace a head if more than a few. Yes, it's 2009. I've already discussed it with service guys and they said that it's ok, 823 and 5364 can be installed together even in Arlington on factory because it's absolutely the same. This is an older thread, you may not receive a response, and could be reviving an old thread.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 ...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, it used cylinder heads closely related to the LS2 and LS6. The engine came with flat-top pistons for increased compression, and has a unique camshaft. For marketing purposes, it was known as the Vortec 5300 H.O.Thanks and for those that are intersted this is what was found thanks to Lothar pointing out my crappy search terms. Casting Number 241. Head: 1997+ LS1 5.7 Litre Passenger Car. Material: Aluminimum. Part Number: 12559853 (1997-98) 12559853 (1999-00) (not sure why same PN) 12564241 (2001-03) Combustion Chamber Volume: 66.67cc.But keep in mind, the 241 castings have a 65CC chamber roughly, versus teh 63.5CC chamber on the 243. When using a combo like Bill's, more compression will really help and wake it up down low, even more than the normal 63.5CC chamber. We're probably going to make his 60-60.5CC's and bump him to 11.5:1.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...1969 302 DZ Heads. Hi, this is my first post on this forum. I am restoring a 69 Camaro. The heads are 3927186 castings witha date code of J 11 8 and J 28 8. They are the big valve 2.02 and 1.6. Untouched and unported.What I want to know is, did the Z28 motors heads come with guideplates or without in stock form ?Apr 30, 2024 · 862 heads vs 243. The 862 casting number represents the 862 cylinder head. The 862 heads came on all LQ9 6.0 engine blocks and are completely interchangeable with the 243 cylinder head. Both the 243 and 862 heads have the same 64cc combustion chamber, but there are some very slight differences in the pore size of the two heads.Find Parts and Accessories 243 heads KEYWORD and get Free Shipping on Orders Over $109 at Summit Racing! Use your Summit Racing SpeedCard today, and get up to 10% back - Get Details! ... Cylinder Heads, Remanufactured, Assembled, Aluminum, Natural, Buick, Cadillac, Chevy, GMC, Hummer, Isuzu, Pontiac, Saab, Workhorse, V8, Each. Part Number: VRE ...TEA Stage 2 Heads $1320 w/ 2.04/1.57 valves and dual springs. AI CNC Heads are $1245 w/ new stock valves and dual springs. It seems like the TEA has an obvious advantage in flow with the 2.04 intake valves but AI does not have any options for larger valves on their website.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.823 vs 243 heads. 823 vs 821 heads. 823 vs 799 heads. 823 vs 706 heads. The Final Verdict. First launched in 2008, installed in the C6 Corvette, General Motors’ LS3 series …Jan 18, 2018 · The 243/799 heads made more power than the 317's in back to back N/A, and boosted, dyno pulls on the same motor. Sounds to me like you've already convinced yourself the 317 is the better head, so I'm not sure why your on here asking. Besides, from your post, headers are too small, so the head choice may be irrelevant.Mar 15, 2024 · 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.243 Heads/Cam Dyno. 8642 Views 94 Replies 20 Participants Last post by Perdieu, Jul 5, 2006 Jump to Latest Baaa ...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 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 Vortec engines wound up on almost every branch ...The LQ4 is a 6.0L LS (Gen. 3) small block engine used in GM trucks between 1999 and 2007. For marketing purposes, it was also known as the Vortec 6000. The engine specs and information listed here is for the stock LQ4 engine. Mechanically similar, General Motors’ LS and LS-based Vortec engines wound up on almost every branch of the GM family ...Find Parts and Accessories 243 ls heads KEYWORD and get Free Shipping on Orders Over $109 at Summit Racing! Use your Summit Racing SpeedCard today, and get up to 10% back - Get Details! ... 243/257 dur @.050", .689"/.672" lift, 108.5 deg LSA. Part Number: CXM-03-08-0098. Not Yet Reviewed. Estimated Ship Date: May 23, 2024 if ordered today. Free ...The 241 heads were used on 5.7L LS1 applications and are considered by many to be just a minor step up in performance from the 706. In terms of peak flow, the …A good shower doesn’t just get you clean; it also relaxes and refreshes the body and spirit. If your shower isn’t blissing you out, perhaps it’s time to upgrade to a shiny new show...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.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.. Head gasket repairs can be expensive, butSep 28, 2011 · I would think a 243 head is a 243 head, I think 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.243 heads, 05/06 FRC~ Jump to Latest Follow ... Come discuss mods, horsepower, engine specs and more! Show Less . Full Forum Listing. Explore Our Forums. Appearance/Detailing LS1/LS2 Engine Tech Texas Drivetrain Wheels/Tires. Top Contributors this Month View All You can find 243 heads on a Vette or on a Che 1969 302 DZ Heads. Hi, this is my first post on this forum. I am restoring a 69 Camaro. The heads are 3927186 castings witha date code of J 11 8 and J 28 8. They are the big valve 2.02 and 1.6. Untouched and unported.What I want to know is, did the Z28 motors heads come with guideplates or without in stock form ? Sep 16, 2022 · The General Electric LM2500 engine with its 243 hea...
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