243 and 799 heads

NEW CNC Ported LS1/LS6 Cylinder Heads . CNC ported GM 243/799 Castings 228cc intake runner, 84cc exhaust 64cc chamber ssold in pairs. 73 gears, NW 102mm TB,matchported FAST 102 Any chance it might have a 243 or a 799 head on CNC Porting. 02 Intake Valve 1. Hey everyone. 95: ‎799 : OEM Part Number ‎799 243 : Additional Information. #10 · Dec 26, 2012. Nov 27, 2005 · Mods: 243 Heads - 224/224 Cam - Ps Lt's- Magnaflow Exhaust - UD Pulley - Svede OTRI - Advanced Dyno Tune - King 0 Springs - Pedders GSR Shocks - Ultra Motor Mounts - SCSS Trans Mount Appearance: 06 Hood - 06 Tails - 15% Tint - 18's Dyno: Just over 400 WHP Waiting to Install Fast 90mm Intake - SJM linelock Aug 18, 2011 · 241 was used on 01-04 LS1 engines. 02Intake/1. 7-liter LS6 that came in the 2001-2004 Corvette Z06, the 243 was reused on the later 6-liter LS2 in 2005, and also came as an otherwise identical "799" casting when it was Apr 26, 2018 · A 205cc runner head is a good match with the TBSS intake. PRC CNC Porting/Machining Service Includes: Expedited Core Exchange - We will ship you a set of CNC ported heads fresh out of the machine and set up to your cam specs once the order is placed. 219. I have an 06 manf. Looks like sodium exhaust valves are about 65 grams and the intakes are 74 grams. Cylinder head Assembly + $150. summ Apr 1, 2014 · Your average port speed will be better with 300cfm at 225cc than 260cfm at 215cc. Wilkes Performance, the #1 fastest growing source for shaft rocker arm systems, CNC ported performance cylinder heads. Your Price: $350. 111. At a mere 15 cc over stock volume this particular port sees gains of over 40 cfm on the intake utilizing a factory GM 2. 3L, 5. The LS 243 Cathedral Port cylinder heads are renowned for their exceptional performance capabilities over the other cathedral port offerings. ( 1 ) Estimated Ship Date:Monday 6/17/2024. 89 inches respectively. Typical gains are 10-20rwhp. 700. Nov 15, 2022 · Buy GM LS2 LS6 Gen III Gen IV Cylinder Head 799 Assembly w/Rocker Arms OEM $350. GM's #243 or #799 LS6/LS2 head casting is the most sought after GM cathedral port casting. Porting theory on raising the roof Jun 5, 2020 · The 243 heads have larger intake and exhaust ports than the stock heads, allowing for an improved airflow that increases torque and horsepower. 1 CR), 200cc intake runners, and 70cc (round) exhaust ports. com/parts/SUM-174002cam retainerhttps://www. Both 799 and 243 casting are the same and have the same compresstion. Oct 21, 2019 · There are tons of heads out there yours probably came with the 799 castings like my 6. 575 in. 8L flat tops to the 5. 0L WHO WINS? Check out this comparison between the 706, 799, LY6 and TFS 225 heads on a cammed 6. They'll never be rock stars but they'll do fine with that cam. date is 02/06 it has#243 heads on it. **No matter what method you choose, once order is Jan 14, 2018 · I know 243's are good but didn't know if 862's are any good when they're right in front of me. Porting cylinder heads has long been a right of passage for serious hot rodders looking to add power on a modest budget. 3 engine and the heads on it are marked #799. 3L 6. You could swap valves as long as the seats are cut the same but it's not recommended. 799 head users can verify the valve seating of the cylinder heads by engaging vacuum and pressure testing. 59 Valves PAIR Dec 24, 2017 · 0. Aug 25, 2011 · Not all 243 heads have hollow valves, only 243s out of 02-04 zo6s. I know 243 and 823 are good ones but trying to find them can be difficult. Efficiency counts!!! Don't just chase CFM. Our testing showed The 799 cylinder heads are in the similitude to the 2004 LS2 cylinder heads due to the triangle casting marks similarity. Description: Cylinder Head 97-04 Chevy LS1/LS6 243/799. 02/1. 7 Litre Passenger Car. 5:1. The 243 heads produce about 5% more power on flow alone. Part Number:SUM-162LS210CATH. I don't have to funds to port them, so I'm looking into some simple tweaks to get them to flow a little better while I have them apart. The idea was to flow and measure each Jan 7, 2010 · Economical upgrades for 243/799 heads. However, the Discussion on Proper Bowl Cut percentage when porting heads. The 243's have a slightly smoother cast around some exterior edges, but the machining is identical and they flow and work exactly the same. CNC Ported LS1/LS6 243/799 Cylinder Heads . Quantity. 600-inch of lift to 320 cfm. Variations *. 0L. Cathedral Intake Ports. The 799/243 will kill what little compression you have now unless you mill them. In 2010, Chevy began manufacturing 799 heads on the L20 4. Is this from the factory or did somebody replace a head at some point? I see it lists 799/243 as the factory heads but I also have seen articles stating the 243 is investment cast and 799 is semi-permanent mold. Feb 13, 2020 · Most people tend to grab up 317 heads because they have the same improved ports as the more expensive 243 and 799 heads. 221. Engine is a 6. Jun 2, 2019 · 243/799 are functionally the same, as @art notes the difference is casting facility location. Service Sold Per Set. Has any one flow bench tested the stock 799 heads and the 243 heads ( triangle marked) ? Haven't seen any data, but it's splitting hairs. I already know that I need to mill the heads . But the 317 heads have much larger combustion chambers (71. - This listing is for a rebuilt GM 5. Discover a variety of Cylinder head collection to cater to your vehicle's specific requirements. Jun 6, 2018 · The best factory cathedral port heads (243, 799, and 317 castings) flowed near 250 cfm, which represented a huge step up from the conventional small-block heads that preceded them. 0 liter V-8 cylinder head casting 243 only you must have an exchange with the exact same casting number. Our fully CNC'd 243 heads give your choice in stock 2. 00 inches respectively. 3. The LS6 and the later LQ9-LQ4 heads used reshaped intake ports and D-shaped -- as opposed to oval-shaped -- exhaust ports for better flow: 200 cfm intake and 70 cfm exhaust for the 241's, and 210 intake and 75 cfm for the 243's. Here is a dyno graph from Richard holdener. Things to try for improvements, I'd put a smaller valve in to protect the seats and carefully blend the cutter edge in the chamber out. Don’t mind a little downtime? The 799 and 243 casting Cathedral-port cylinder heads can be CNC ported to flow close to the aftermarket heads. Engine Size: 5. 823 Heads – Everything You Should Know About. I know that 243's are Zo6 heads, but I was told that 799 castings were the exact same heads. You might want to do some research into the 243. Buy in monthly payments with Affirm on orders over $50. 55" exhaust valve, 75cc exhaust runner, and it has a 64. I have found some 799 heads for sale at a really decent price. After searching today seems like a truckload became available all of the sudden. Its first order of business is sealing the top of the cylinder (the piston seals the other end). Mar 11, 2023 · Due to the differences in port size and valve size, the 243 and 799 heads offer different combustion efficiencies. 590˝ exhaust valves. GM LS Cylinder Head # 243 / 799 Bare Pair - Part #EQ-CH364B. 3L/LS1/LS2/LS6 Cylinder Heads Fully CNC Ported & Assembled With Choice of Your Stock or Stainless Steel 2. Dec 2, 2022 · Chevy Cylinder Head LS1/LS6 243/799 - PAIR, Year:97-04. 6 Exhaust Valve, 3. Made from the highest grade aluminum. My Cuz has an 07 manf. Our stage 1 porting service will include the re-use of the stock vales. This seems slightly ropey in terms of performance. Opens in a new window or tab. Casting Number 241. This article applies to Chevrolet Camaro and Pontiac Firebird (1998-2002), as well as all LSx engines. I also have a 08 silverado with the 5. 7L, or 6. 67 cc combustion chamber (10. They are available in cathedral port and rectangular port designs to match your GM LS Engine needs. 600 exhaust with an intake flow of 320cfm and an exhaust flow of 221cfm. Head: 1997+ LS1 5. And then compare it with the 243/799 cylinder head CNC Ported LS1 243 / 799 Cylinder Heads, Customer Supplied Bare Casting heads. They both have a 66. com/parts/btc-trucknorrisLink to valve springs https://www. Resurface for MLS Gaskets + $150. A proper performance multi-angle valve job is definitely in order. Learn more. 8L/5. 0 with the comp 54-459-11. Jul 31, 2020 · The 243/799 heads have cathedral ports with improvements destined for the LS6 Corvette and later the LS2. 7/6L's. Mar 2, 2021 · The 243/799 cylinder heads come with a 2. 7846 posts · Joined 2006. 650 Springs 2. The only exception being if you get a set of 243 heads off of a LS6 engine, those heads will have lightweight sodium filled valves but that won't make any difference in your power output. #11 · Jul 12, 2022. 4. On the other hand, the 862 head is compatible with LR4, LM4, and LM7 and such engines where low torque is more essential than better horsepower. Part Number: 555-514055. GM's #243 casting is a great cathedral head that has phenomenal potential with the right work applied. Otherwise, everything is the same. The cylinder head (or "head") has several main functions. xpressmotorsports (475) 100%. 3 liter V-8 . Review this item. Ai 218cc CNC'd GM 243 LS2/LS6 Cylinder Head Package. 01 243's and any other 243's that came off an ls2 or other engine have regular valves so they are the exact same as 799's. im running a set of 243s milled and p&p on my lq4. Free shipping. Also 2001 243 z06 heads have blue springs which had less lift capability, . Replaces Casting Numbers: 243 / 799 – LS1 / LS6. Part Number: RH799 Cylinder Head. We also offer valve spring upgrades. 5 CR on LS6), 210cc intake runners, and 75cc D-shaped exhaust ports. Aug 2, 2010 · Compression Ratio & Combustion Chamber Size. This makes them perfect for high-flow, high-RPM applications, providing more power at higher speeds. 650 Springs and 2. This package has found great success amongst enthusiasts seeking area under the curve, phenomenal throttle response, and no The 243 head has better casting and a narrower chamber for more excellent compression. I'm looking to install a set of 243/799 heads on my 5. Remanufactured. Once your usable cores have made their way to us, LME will refund the cost of the cores. 02" Intake Valves, 1. According to Internet folklore, the 317 heads used on the 6. 0L truck engines share the intake port design with the 799 (243) heads. Dec 6, 2013 · 799 heads milling. . 21 watchers. Thats easily a 100K mile motor. On occasion a 100% CNC ported head might have casting areas left “as cast”. 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. Looks lke they came across a bunch of them as they are listing on ebay also. The 799/243 head is great for flow, but given that your engine originally came with 706 heads, it likely has dished pistons. Options. CALL US AT 800-942-4503 IF YOU HAVE ANY QUESTIONS. Dec 2, 2019 · I compared a set of stock 799/243 cathedral-port heads vs the 823 LY6 rec-port heads on an LY6 short lbock. Additionally, these upgraded 243 heads are designed with a higher-lift camshaft so link to camhttps://www. Year Range: 97-04. 559 107, Hedman Headers, Magnaflow Exhaust. Current GM LS1 243 Cylinder Head core value is $250. 700 Lift Dual Spring Kit. Dec 22, 2017 · In terms of cylinder heads, we included the 706 small-valve 5. Browse through our extensive Chevrolet Cylinder Heads lineup to discover the perfect Cylinder head solution for your vehicle. The 799 heads were among the newly released cylinder heads with a semi-permanent mold model, making them look similar to the 2004 LS 2 cylinder heads (a triangular casting); the only difference is that they are not polished; for example, the 243 cylinder Heads. Email a friend. 3L HO's and the Gen IV 5. They won't flow as good as 243 but you'll have better compression vs 243. This is due to core shift and this in no way affects performance. Apr 15, 2023 · The 799 head is designed and made to be compatible with high-performing LS engines, such as 4. Material: Aluminimum. Upgrade your LS1 or LS6 engine with our CNC Ported 243/799 Cylinder Heads with . This is the stage 2 package with larger valves, estimating an extra 50HP o Fits. 3's had the 243 heads and from what I read they are the most desirable. They also had larger 2. 1969 Corvette, 427 Convertible. 570 the yellow springs came out in 02 because FILTER BY: CLEAR ALL. That cam is BIGGER than the BTR stage 4 TURBO cam, and in cam terms vastly larger than your BTR 3 truck cam. 02'-04' Z06 Vettes were the only vehicles that came with sodium filled valves in 243 heads. Those 243 heads used Hollow Stem and Sodium Filled Intake/Exhaust Valves, which are much lighter. Brand New. The stock heads have a combustion chamber volume of 61. 3, you need compression or boost. If porting its a non-issue. 650. $688. Manufacturer: Chevrolet. date 09/06 it has the #799 heads. 590/. 242. 06cc), which Mar 9, 2016 · By Paul Johnson - March 9, 2016. 0L truck), and 799 (as a stand-in for the hallowed 243) heads. Precision Race Components Customer-Supplied 4. Oct 11, 2010 · And the specs on the heads. The intake port has smaller chambers than its counterpart, which helps to enhance air and fuel intake, smooth combustion, and quicker exhausting. They said in the thread that the #799 heads where used on the 5. 7L V8 engine, providing optimal performance and durability. 7L - 350ci - V8. The 243/799 3cc bigger combustion chamber might not seem like much but let's look at the factory Compression Ratio as seen here. The 243 heads are designed for high-flow, high-RPM applications, while the 799 heads are optimized for low-end torque and better fuel economy. Sep 10, 2008 · That's true. The exhaust ports get opened up to 84cc, and the chambers stay at 65cc in the off-the-shelf configuration. 59 Valves. Oversized Stainless Steel Valves. Related Products of 243 Cylinder Heads: CNC Ported LS1/LS6 243/799 Cylinder Heads . 5to1 compression they are pretty good stock heads. they will bolt right up and should give you i think around 10. With this increased airflow comes a greater capacity to burn fuel efficiently, giving you better performance overall. Description: CNC Ported LS1/LS6 243/799 Style Cyl Heads . Part Number: 12559853 (1997-98) 12559853 (1999-00) (not sure why same PN) 12564241 (2001-03) Combustion Chamber Volume: 66. #4 · Sep 29, 2008. Though the 799 and 243 cylinder heads are similar in many ways, you can see from the table above that there are slight differences as well. Free Shipping. Speed Direct Rack and Pinion, Semi Coilovers Part#: ALL-65056NPC. The combination of the two will pull strongly up to 7,000 rpm. 799 is the same as a 243 head that comes on the ls2/ls6 ect. With their cathedral port design, larger valves, and improved airflow Feb 28, 2013 · Justin Cesler Writer Feb 28, 2013. 0L, etc. Incidentally, 799 heads are essentially identical to 243 heads, but the 243 casting has a smoother finish. These heads are designed to maximize airflow and combustion efficiency, taking advantage of the LS6 engine's power potential. 45cc chamber for more compression (10. Jan 6, 2009 · They said there was a difference in the heads. Color the port, accurately secure/lightly scribe the reference. Part#: ALL-65056. Sep 28, 2015 · Despite numerous differences the Gen III LS Engine and Gen IV LS Engine cylinder blocks share a lot of the same traits. 00" intake valve, 210cc intake runner, a 1. For GM LS2 LS6 Gen III Gen IV Pair Cylinder Heads 243 799 Casting 5. However, the Dec 25, 2012 · s10xtremist Discussion starter. Mar 13, 2018 · The obvious answer for any question regarding factory cathedral port heads is never the stock 706 heads, and always the legendary LS6 heads, right? I mean, the 243 (or later 799) is the go-to head Jan 24, 2023 · With that, we packed up our heads and shipped them off to Lingenfelter Performance Engineering (LPE). Jun 22, 2023 · The first has to do with port shape. 20240226_153509[1] 20230716_132529[1] Sep 6, 2018 · LMG Cylinder Head Specs; Casting Numbers: 799, 243: Material: Aluminum: Combustion Chamber Volume: 65cc: Intake Port Shape: Cathedral: Intake Runner Volume: 210cc: Exhaust Port Shape: D-Port: Exhaust Runner Volume: 75cc: Intake Valve Diameter: 2. 3L and 4. My question is does anyone know how much a 799 head can be milled and still fit on an LS1 block Mar 16, 2018 · Even the 799/243 heads on the aluminum 5. 00 intake valves than the Gen III. My stock compression ratio is 9. 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. Apr 21, 2024 · 799 Vs 243 Heads: Main Feature Comparison. EQ bare heads – ready to install the valve train! All EQ cylinder heads outperform their competitors! Thicker deck for greater strength. 193. 1. 496CI Edelbrock Heads, Quickfuel Carb, LS6 Intake. Lingenfelter's 243/799 CNC program opens the intake port (left) to 228cc and increases flow at . 3 in the Silverado lose 12lb ft of torque over the 706/862 casting in a back to back test. you will be just fine just need some tuning wich you will need anyways. Try to make that area just an extension of your top angle. 8L trucks were equipped with these heads. 4. 799 heads have a cathedral port shape (with a point at one end) which delivers improved performance down low, but for top end sportiness, stick with 823s. In Stock. Valve Job with new Valve Guides + $400. 600 Lift Ea. 550 or upgraded 2. The valve seating of the 799 heads is resistant to pressure Dec 2, 2010 · 799 vs 243 heads. Get the 60cc heads and enjoy the compression boost. Related Search – 243 heads: 243 heads specs that make it special Apr 2, 2020 · Originally on the 5. The second major difference is that the LS6 heads used hollow, sodium-filled Dec 18, 2017 · You could always Google search "243 vs 799 vs 706 head comparison by Richard Holdener" and find: The Ultimate Chevrolet LS Cylinder Head Test - Stock LS1 Dyno - Hot Rod Network I did Google it and did find that, but it only compares LS1 stock head to aftermarket heads. 0. FED . However, it is essential to ensure installation is done as per the manufacturer’s instructions. 3L heads, the 241 (LS1), 317 (6. Dec 23, 2016. 00" valve. 3 5. 15570 posts · Joined 2004. It seems unlikely that the factory would pair one of each together. 243 and 799 – LS1/LS2/LS6 Cathedral Stage 2 Porting Service (SET) $ 1,224. 5cc combustion chamber. 0intake/1. Mar 8, 2018 · The obvious answer for any question regarding factory cathedral port heads is never the stock 706 heads, and always the legendary LS6 heads, right? I mean, the 243 (or later 799) is the go-to head Nov 27, 2006 · Like I said in my other post here the 799/243 heads are the same. 8L and 5. These Cylinder Heads are specifically crafted for the 97-04 Chevy models with a 5. Aug 18, 2011 · GM added the 4. This benefit occurs because of the hollow valve stem, delivering a better RPM potential that stands up to more supercharger or turbo applications. 823 vs 706 heads Jul 10, 2022 · 741 posts · Joined 2004. Iroc-10 said: They ran the yellow springs on most of the 243/799 heads, because in the end, they ran them on the GTO, and TBSS, as well as the higher HP 5. 243 799 CASTING CYLINDER HEAD SET PAIR LS LSX LS1 5. Dec 23, 2016 · WNY. Add to Cart. These heads can be CNC-ported to improve on flow and milled for higher compression. Intake valve 88-90% and Exhaust 86-87%. Jan 24, 2018 · Received 53 Likes on 47 Posts. 96. 525 instead of. 9. JEGS 514055. summitracing. The price listed is for you sending your cathedral port cylinder heads (4. Like mentioned tho, 243 heads have a smoother finish, while 799 heads are a bit rougher. #2. 3L truck engines Jun 29, 2023 · 823 vs 799 Heads. If you want to make power with a 5. Thus, if you are pursuing speed, sticking with the 823-cylinder head is a wise move. 95. 898+ bore sizes, Max . 2. They flow more smoothly and can generate more than 5% of their horsepower from flow alone. Description: Cylinder Head 97-04 Chevy LS1/LS6 243/799 - PAIR Upgrade your Chevy LS1 or LS6 engine with this pair of Cylinder Heads designed to exceed OEM specifications. 0 did. Chevy GM 799 LS6 LS2 LS CNC Ported Cylinder Heads w/ BTR Spring Package. Check out Our Other Articles: Everything You Need to Know about LS3 Heads. May 19, 2010 · 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. derosnopS. 8. Stage 2. Jun 11, 2018 · The best factory cathedral port heads (243, 799, and 317 castings) flowed near 250 cfm, which represented a huge step up from the conventional small-block heads that preceded them. If you were to judge the 243 heads vs. THE CASTING NUMBER ON THIS CYLINDER HEAD WILL EITHER BE 243 OR 799, PLEASE SPECIFIY AT CHECKOUT. $2,300. 197. Add a Fast 90mm intake, cam, and you have an 400hp iron block LS6. Straub Technologies 229/235 . You could bore to the LS1 pistons run them and get a set of ported 243's. $740. For GM LS2 LS6 Gen III / Gen IV Cylinder Head 243 Casting, 799 Casting New. These high-performance heads, designed by Chevrolet, are meticulously to exceed OEM specifications, ensuring top-notch quality. 165˝ intake valves and 1. Improved design resists cracking. C5 Tech - 243 vs 799 head casting numbers - Can anyone tell me the difference between 243 heads vs 799's. 400 Bore Spacing (same as the original SBC) Deep Skirt Block with Six Bolt Cross Bolted Main Bearing Caps (reminiscent of the old Ford side oilers, FE, and some early hemi blocks) Center Main Thrust Bearing. Cylinder Head Bolt Style: Torque to Yield (TTY) Cylinder Sep 29, 2008 · ddawson. Jul 31, 2023 · 243 heads are known for their larger port and valve sizes, which are typically about 210cc and 2. 240 Deck Height. The 243 head is the 01+ LS6/LS2 head. Sep 6, 2023 · Also, all the heads have a new valve stem and can be replaced with new ones to ensure high-quality performance. If you are changing the pistons GM 243, 799, & 317 LS2/LS6 Options: Performance Rebuild Package Our Performance Rebuild option includes our high end CNC'd valve jobs, precision valve grinding, milling to any chamber volume, cleaning, inspection, and professional assembly. Power production increases when the 243 heads are combined Mar 18, 2022 · The 799 cylinder head is better for cars because it is more efficient than the 243 cylinder head. I picked up a set of 799 heads to replace my 241s for a winter project. I went with GM performance LS3 CNC ported heads they were $1800 fully assembled and flow just as good as AFR and Trickflow for a lot less $$$. As mentioned earlier, LS3 heads 823 have two key types of port style. In comparison, 799 cylinder heads are equipped with a common shape of cathedral style at only one point at each end. 3L when they switched to the 243/799 heads on the 5. Top Rated Plus. Only thing is they have been milled but the owner is not sure how much. The 799 cylinder head is a better choice than the 243 cylinder head because it has more capacity. The 01z and ls2 Gto have 243s with steel valves. 195. 45cc. Since their introduction, the 799 heads have demonstrated solid performance and efficiency on the 4. Jun 7, 2018 · 243/799 heads are identical, except 243 heads from a 02-04 C5Z Vette with the LS6 Engine. or Best Offer. Go Slow and take breaks! I wanted to share a good place to start your port work. Chevy LS Cylinder head, 210cc Cathedral port Intake Runner, 64cc Chamber, 2. However, unlike the 243 heads, they do not require cleaning. But does it mean they perform differently? Well, the only way to find that is to compare the important features first. 209. He is going to take them to a machine shop to figure out exact chamber sizes etc. What are the 799 Heads. Buying new 243 heads is ideal for the porting job if you want to undertake cylinder head porting on your car. Manufacturer: Allied Motor Parts. These CNC Ported LS heads, part number ALL-65056PC, fit engines within the 1997-2004 year range and are Jun 3, 2022 · Yes, 243 LS heads have Cathedral shaped intake port and D-shaped exhaust port. $399. On the other hand, the 799 heads have smaller port and valve sizes, around 200cc and 1. Aug 3, 2022 · 823 vs 799 heads. Exhaust Valve Diameter: 1. Sep 24, 2015 · GM 243 (LS6) and 799 (LS2), 226 cc AI’s flagship cathedral port increases the port volume by 15 cc over stock, allowing up to a 41-cfm improvement over stock while still utilizing the factory GM valves (reground). These vehicles require maximum airflow, making the 799 head an ideal choice. They changed the casting number when the heads were carried over to other engines, but the 799 and 243 castings are one in the same. Mar 15, 2024 · The 799 heads were introduced on trucks made in 2005 and later, and the most recent models of 5. 0L? What is the bes GM LS2 LS6 Gen III Gen IV Cylinder Head 799 Assembly w/ Rocker Arms OEM. Chevy Cylinder Head LS1/LS6 243/799, Year:97-04. The second order of business is to provide a way for Summit Racing™ Precision Cast Cylinder Head SUM-162LS210CATH. 007" to lose 1cc of volume. Only difference between the 799 and 243 heads is the process in manufacturing. The combustion of the air and fuel inside a cylinder Starting with a new aluminum casting these heads are fully assembled with all new components including intake valves, exhaust valves, valve springs, retainers, guides, and seats. 67cc. 153. 8L, 5. 15cc, and 243/799 heads have a volume of 64. Only 02-04 243 heads that came off of an ls6 z06 or cts-v have the lightweight valves. the 241s on head flow alone, you’d get a slight power edge. 00. 59 Valves PAIR. 3l's. These heads are almost the same, but the L99 heads used a For GM LS2 LS6 Gen III Gen IV Pair Cylinder Heads 243 799 Casting 5. Cylinders are the chambers in an engine where the fuel-air mixture is ignited by the spark plug. 8/5. The 243 heads off of a LS6 Engine in the CTS-V uses standard valves. Exh. The 317 is a 243 but with a larger CC. It has a smaller 64. Jan 21, 2022 · 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. 226cc Full CNC Porting Package The go-to head for 450-500rwhp 5. I have the 317 on my car with 70CC. I'm no expert on this but, 07 on 5. Bare or Assembled – Frankenstein Engine Dynamics OEM and Aftermarket Cylinder Head Performance Porting. 57 stainless steel valves. Condition: NEW - Aftermarket. Jan 25, 2018 · 2005 Pontiac GTO,NaturallyAspirated 418", 243 heads,stock water pump,3. 7 6. Jun 6, 2011 · Bumpers said: yea they will bolt right up. 575" Exhaust Valves, & Optional TSP Dual Valve Spring Kit with PAC Valve Springs & Titanium Retainers. Free Aug 23, 2018 · The left PASS head is 243 the right DR head is 799. 3, LS1, LS6, LS2, LQ4/9) to us for porting. The 799 heads were formed in a sand process so the ports can be a bit rough compared to the 243 heads. 5 will include aftermarket 2. 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. Armed with the right knowledge, the Jun 16, 2022 · The Big One!!Showing off the new 243 heads ported by Frankenstein Engine Dynamics. 7 or 6. $599. Sellers with highest Feb 18, 2024 · Also known as 799 heads, 243 heads are the best performing aluminum cylinder heads that were standard on 3rd generation GM LS6 & LS2 engines that were produced starting in 2004 & 2005, though they are most well-known for being the cylinder heads for the C5 Corvettes. All the 799 heads have a 3-year unlimited warranty. 8L engine. 000 in. All About 243 . The motor was equipped with a healthy Comp cam an 320. 244. You can have them ported for a reasonable price and have a good valve job done on them to make them perform. ASIN : B0BMHZC8GJ : May 24, 2020 · FULL RESULTS-FACTORY LS HEAD SHOOTOUT, 6. el wf lp gd bv hy rx jv cb wc