243 ls heads. 15cc, and 243/799 heads have a volume of 64.

243 ls heads The valve boss protudes too far into the air stream and enough material cannot be removed Aug 18, 2011 · 6. CNC Ported LS1 243 / 799 Cylinder Heads, Customer Supplied Bare Casting heads (Pair) Pay over time with Affirm. The reason 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. See below on current moda. 02" valve is max on stock seat. Anyways, I'm looking for recommendations for new heads, and I'm trying to keep this budget friendly. 7L / 6. com Jun 12, 2023 · The 243 heads from GM are third-generation cylinder heads designed for performance applications, V8 trucks, SUVs, and vans. 660 Dual Springs INTAKE Lift. Jun 22, 2023 · LS Head Castings General Motors produced seven versions of the LS engine, most of them with different heads. 243 cathedral ls heads 660 springs $400obo Need gone asap I have a set of 243 heads and an extra head which makes a total of 3. They deliver improved cylinder fill in the lower RPM ranges while adding substantial airflow increase in the upper Ranges as well. Stick the later Z06 cam in there and you'll have some really nice numbers and awesome stock driveability. Nov 12, 2017 · Unless you're spending money on AI ported 243's, go with the LS3's. Nov 1, 2022 · This is a SET of Remanufactured OE Stock LS2, LS6, 4. 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. We’ll run through each iteration below, providing chamber and valve sizing, and their pros and cons to help you decide what are the best LS heads for your build. The seat was too small for the larger valve. * May 24, 2016 · When driven hard, engines need coolant pressure to "scrape" the steam bubbles that form on hot spots in the head off the wall of the passage. I know the cam is . Upgrade your LS engine with 1. Learn more GM LS1 LS2 LS6 Gen IV Rebuilt Cylinder Heads #243 w/ Rocker Arms PAIR OEM Remanufactured $699. I then went to a turbo setup, making 639 rwhp @ 8 PSI on 317 heads. 55 inches Note : Surfaced FAQ Video Gallery Click on image to zoom Katech CNC Porting LS2/LS6/Truck 243, 799, 317, 035 Cylinder Heads (PAIR) In Stock (0) Reviews: Write first review New Many hours of R&D have gone into the development of this stout catherdral port CNC program. YOU DON'T NEED TO GUESS WHATS BEST FOR YOU. Their larger valves and high-flow ports unlock significant mid- to high-RPM horsepower, making them ideal for street/strip cars, road course vehicles, and naturally aspirated builds chasing maximum efficiency and power. 243 heads cathedral port, are 243 heads good, what are 243 heads, 241 vs 243 heads, 241 vs 243 he Jun 2, 2023 · What's the difference between 799 vs 243 heads? Is there one at all? Or are these Chevy LS-based small block engine cylinder heads the same? Read to find out. 3 5. Not my first set of head porting, but it is my first LS set. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Nov 15, 2022 · This is a SET OF 2 Remanufactured OE Stock LS2, LS6, 4. So it contacted the aluminum in the chamber along with the seat material. . 000" stainless intake valves. Is it worth going to get 243’s and put them on? Jun 26, 2012 · Ok, just got my 243`s today. 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. 8L / 5. Mar 6, 2025 · LS engine expert Richard Holdener dyno tests & compares the most popular 6. 7 806 97-98 aluminum perimeter bolt 5. WE STRIVE TO MAKE YOUR BUYING PROCESS AS EASY AS POSSIBLE Our Talented Cylinder Head Machinist have years of experience in the industry! DESCRIPTION Professionally rebuilt 5. Aftermarket Heads$13 to $185 $186 to $357 $358 to $528 $529 to $700 Dakota Digital Holley MSD Painless Performance Products Sale Jul 10, 2022 · The 799/243 head is great for flow, but given that your engine originally came with 706 heads, it likely has dished pistons. what would be the difference?? Please help, searched but couldn't find anything real informational. Get the best deals for 243 Heads at eBay. These heads have gained a reputation for delivering exceptional performance and power gains. Aug 31, 2013 · Many cylinder head shops offer 243/799 porting packages with 2. Get the best deals for 243 Ls Head at eBay. 3L engine is a very common engine that people like to do cylinder heads and camshaft swaps with and one of the most commonly asked questions we get is, is it worth swapping over to a set of factory 243/799 cylinder he Aug 7, 2020 · LS2 Stage 3 Camshaft (218/224-116+3) Superior high performance LS & Gen 5 LT camshafts for GM cars and trucks equipped with LS1, LS2, LS3, L99 & new LT engines. started getting used in the higher performance engines like the l33 and then later put on the gen 4 5. 3L tune. Nov 12, 2009 · So I need to start building my new setup, but need to stay within my budget. Jun 16, 2023 · In search of the best LS1 heads for your LS engine, look no further than the DRP LS1 243 cylinder heads. 08 intake with a 1. The Lingenfelter CNC porting procedure is a computer-controlled machining operation that duplicates exact details from a finished Lingenfelter hand-ported cylinder head. Jul 29, 2006 · Guys, Who has gone from a stock 241 ls1 2004 GTO head to a fully ported 243 ls2 ls6 head on there 2004 gto? I'm looking to see what hp difference 1/4 MILE times/mph 60FT If you could please share results Please post best ET MPH 60'FT with before and after. 0 youre looking at close to the same compression as an ls2 since ls2's are 6. My goal is around 375-400 rwhp with full bolt ons,nothing too Jun 24, 2012 · C6 Tech/Performance - 243 Head flow chart - I can't decide on having my 243 heads polished and CNC ported or getting a set of trick flow heads. 625 Behive or . 400. com FREE DELIVERY possible on eligible purchases Nov 6, 2017 · 799/243 are the same head just depends where they were made. The stock 241 head flows at 220 on the intake. Top LS1 engine's use these DRP ultimate LS performance cylinder heads. 55 inches * Note Jan 1, 2025 · The 243 heads are the go-to option for performance-focused LS builds, especially on 5. Just to get to Jan 7, 2010 · I picked up a set of 799 heads to replace my 241s for a winter project. 0L LS engine cylinder heads to see which ones perform the best. Feb 25, 2011 · If I remember correctly the LS6 (243) stronger spings than the LS1 (241) - Hands down the LS6 head flows better than the LS1 due to the runner volumes and the smaller combustion chambers! LS6 heads are refined and improved LS1 heads, basically: - Intake runner volume increased to 210cc vs. Image is a representation of this item. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Jan 26, 2025 · If you like playing around with factory-installed cylinder heads with aftermarket ones, you have many options to explore. Proven LS Horsepower. Upgrade your LS engine with high-performance LS1 and LS2 cylinder heads. These heads come on GMC and Chevrolet trucks and SUV's. 7 853 99-00 aluminum center bolt 5. Made from the highest grade aluminum. Feb 10, 2012 · C5 Tech - 243 heads on ls3? - What would the compression be if i put factory 243 heads on an ls3 block? Also, would the ls6 cam work well with that? Anybody have a setup like that? If you're curious, I'm wanting to build a budget motor with ls3 bare block and use parts from my ls6. Just like the title says, How much more h/p gain will I have on my car if i install 03 zo6 243 stock heads to my gto. 100 65 . 525 on both sides, but how much lift can the stock valve springs take on stock 243 heads? Mar 11, 2010 · Patriot heads are about $1300+/-. vs 70 - Combustion chamber is smaller at 64. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Jan 24, 2023 · You have an stock head with a large intake port, decently sized intake and exhaust valves, and overall, quality aluminum castings right off the production line — especially when compared to the LS’s spiritual predecessor. JEGS LS Aluminum Cylinder Heads are the perfect replacement or upgrade for your LS-based engine. I now know I would like the tbss intake manifold, but based on what I’ve been reading the 706’s and 243’s are pretty similar. Dec 14, 2010 · So, basically, std valves will bolt right in the 243 heads (they are used in the lS2 engine, which has 243 heads). The 243 and the 799 cylinder heads are practically the same. To get a Ls2/Ls6 head to flow what a L92/Ls3 head flows will take a lot of work, and you'll never be able to match valve sizes. You can identify which head you have by looking at the three-digit stamping next to the valve cover; for example, the LS1 used head castings 339 and 806 through 1998, and 853 and 241 from 1999 through 2004. Maximum performance & precision with the best CNC ported 243 heads. 3 the same as the 6. 3 LS could be had with one of four cylinder heads: 706 heads, 862 heads, 799 heads, or 243 heads. 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. How much power would be the return on this ? Got a decent deal it?s brand new just wondering before I Lingenfelter #243 casting LS6, LS2 cylinder heads are precision CNC machined in house to insure that exact tolerances are maintained. With outstanding flow numbers and an efficient port shape, the LME CNC ported LS1 243s bring value and performance together. Jan 5, 2023 · Cylinder heads are an important part of any engine and can make a big difference in the performance of your vehicle. 8 Silverado with stock 706 heads. It is important to understand the differences between 243 and 799 cylinder heads, as they are two of the most popular cylinder head options for a Chevy. Most other aftermarket heads will be over $2000 for the heads alone. Are they a direct swap, or will i have have to get different length pushrods? Also if i can just change them out, how much of a power gain will i see with a stock cam? And any ideas for a very mild cam to add with these heads as well. ## By specifying your cam lift LME will assemble your cylinder heads with the proper spring instal Jun 10, 2008 · Is it worth to put stock 243 heads on an LS1 or just wait to have them ported? If so how much power is it worth? Get the best deals for Ls Heads 243 at eBay. 15cc, and 243/799 heads have a volume of 64. The 243 head came on the more powerful LS6 engine from 2001 to 2006, and was Brawler LS3 Style CNC Ported Cylinder Heads w/ TSP . The LS6 bumped up to 405 HP and 400 foot-pounds of torque in 2002. Top-quality 243 LS heads for sale & LS cathedral port heads. The sophisticated architecture with a cathedral-shaped port allowed 799 heads to offer amazing performance on On the other hand, the 243 cylinder heads are designed for LS-based engines, which include a wide range of GM vehicles equipped with LS1, LS2, LS3, LS6, and LS7 engines. We have a great online selection at the lowest prices with Fast & Free shipping on many items! If you are looking for a great replacement/upgraded LS1/LS6-style Cathedral Port cylinder head, look no further than these fully CNC ported Brawler cylinder heads! These are inspired from a factory GM LS6 cylinder head casting but with our tried and true CNC porting program. Only at www. 04 and 1. What’s So Special About 243 Heads? The 243 heads came on the LS6 engine produced from 2001 to 2006 Apr 15, 2022 · These 799 heads are the latest model and are made using the semi-permanent mold method. Here's more reading than you ever cared to do on LS heads: 933 97 aluminum perimeter bolt 5. 0 engines. Shop Now at the Guaranteed Lowest Price! At LS Performance Racing we understand that the Gen3 LM7 5. Mar 28, 2011 · Pedders XA Track 1, Patriot/Zamora's Racing Heads Mission, TX Stage 3 243 Heads, Forged 403 Eagle ESP Stroker, TSP Cam, Heavily Modified LS2 Intake, P&P TB, ASP-UDP, Kooks SS w/ catts, Magnaflow Cat Back, Vararam, Drilled & Slotted Rotors w/ Ceramic Pads, Difftech 3:91 w/KAAZ, G Force 1320 Toe Links, Driveshaft Shop Stubs-Half Shafts-Driveshaft, Circle D Pro Series Converter and Transmission Dec 1, 2010 · We test 11 different Chevrolet LS cylinder heads to see which one flows the most and produces the most hp and torque. FAQ Video Gallery Click on image to zoom Katech CNC Porting Bundle LS2/LS6/Truck 243, 799, 317, 035 Cylinder Heads (PAIR) In Stock (0) Reviews: Write first review New The standard issue LS1 heads is best all-around head for the street / strip engines . Unlike cathedral-port heads (706, 317, 243, etc. They produce 365cfm vs the 243's 325cfm at the same lift. I have a set of 243 heads sitting here that I'd like to upgrade. 8:1, AND the stock tune has about 10* more spark timing in it than the 5. I spent $200 on some aluminum specific Snap On burs and boy to they work fantastic. This a mod On my wish list :) Aug 9, 2011 · I'm looking to see if anyone knows roughly what kind of horsepower loss might be expected when switching from 243 to 317 heads. WHICH HEADMAKES MORE? We compared the four most popular stock LS heads in a back to back shootout. 45cc. 45 cc vs 66. 9x second ET's at the track with 508 rwhp, using stock 243 heads. One of the good features of cylinder heads like the 243 heads is that they allow enough ventilation and fuel to get into your car’s cylinder, providing faster combustion and smooth exhaust. It originally produced 385 horsepower. just guessing here. 0? And lastly should i buy them this weekend? Jan 21, 2022 · All LS cylinder heads have performance potential, but as with any aspect of engine building, the end goal determines the starting point. 99 GM LS Cylinder Head # 243 / 799 Bare Pair - Part #EQ-CH364B Replaces Casting Numbers: 243 / 799 – LS1 / LS6. com. Rebuilt heads with cathedral intake ports, sold as a pair. Of course, due to the much larger intake valve in the LS3 heads, comparatively they flow better everywhere (low lift, mid and high) but they have a 70cc chamber. Also are the 243 heads off a 5. Last edited by 1slowbusa; 08-18-2011 at 04:09 PM. 200 - Exhaust runner volume increased to 75cc. Jun 2, 2025 · Our 243CC LS1 / LS2 Cathedral Port Cylinder Head was developed specifically for the stock displacement LS engine. Jan 22, 2012 · Looking at getting either 243 Heads or now I see these 317 Heads from an LQ9/LQ4 motor. BUT, IF you use an '02-'04 Z06 cam, or many of the aftermarket hi-lift cams, then you will need to use longer pushrods to offset the smaller base circles on these cams. 8L , 5. 7/1 comp, 243/258/110 comp cam with . EQ bare heads – ready to install the valve train! All EQ cylinder heads outperform their competitors! Thicker deck for greater strength Improved design resists cracking Lingenfelter #243 casting LS6, LS2 cylinder heads are precision CNC machined in house to insure that exact tolerances are maintained. 00 inches Exhaust Valve Diameter: 1. Nov 2, 2022 · Buy GM LS2 LS6 Gen III Gen IV SET OF 2 Cylinder Heads 243 Assembly w/Rocker Arms 799 OEM REMANUFACTURED SET of 2: Cylinder Heads - Amazon. Dec 18, 2010 · hey guys i wanna order a set of 243's for my ls1. 0L Specs : Combustion Chamber Volume: 64. Part # : 243 casting also replaces 799 Description : Stock LS Series 4. Many hours of R&amp;D have gone into the development of this stout catherdral port CNC program. 3. What prompts this question is that I was running 10. 3L, 5. My stock compression ratio is 9. The 243 heads are often called LS6 heads because they were found on the 2001 – 2006 LS6 engines. But as for me, I tried swapping my 799 cylinder head with 243 to see if it changed anything in my Chevy. 317 and 243's flow the same. It’s hard to find a negative work spoke about this iconic and all-important component. 00 is charged up front and will be reimbursed when we receive the core 243 heads back. The choice depends on your vehicle’s specific needs and your driving style. One of the more coveted of the Gen-III/Gen-IV castings is the so-called 243 and 799 heads. 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. 0 with 243's youre going from 310 or what ever the stock numbers are plus 30 maybe 40. Dec 3, 2024 · 243 vs 799 Cylinder Heads 243 and 799 cylinder heads, part of the LS engine family, differ in performance, fuel efficiency, and cost. 3L and 4. 0 with 243 heads, some are 799 but the same. 3, 5. Except for the LQ9, a replica of the LS6, the LS6 is the best-performing OEM cathedral port. The 243 heads as used on the LS2 motor flow at 260 CFM on the intake. 00 Free shipping GM LS1 LS2 LS6 Gen IV Rebuilt Cylinder Heads #243 w/ Rocker Arms PAIR OEM $769. 02" 1. The 243 heads are a bit more efficient and explains why you can't run as much ignition advace with them compared to LS1 castings. Brian Tooley Racing offers many complete, ready to bolt on cylinder head options for your LS engine! Jun 30, 2019 · C5 Tech - 6. 99 Free shipping Dec 15, 2010 · This is rarely brought up, but the combustion chamber design of the L92/Ls3 heads is superior to the 241/243 chambers. I was always told that 2. 3l trucks and so on. Actual item may vary. 200 145 . 0L, LS1, or LS2 short blocks. OEM Interchangeable: Replaces GM casting numbers 243 and 799, making these heads ideal for LS engine builds or replacements with stock or aftermarket components. I was considering Oct 14, 2019 · Had 10. And will you believe it if I tell you that the result caught me off-guard? […] LS1 LS3 11 Degree LS7 LSA 243 799 862 706 317 CNC ported Shaft Rocker Arms Find Parts and Accessories 243 ls heads KEYWORD and get Free Shipping on Orders Over $109 at Summit Racing! 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. Get the Best Performance with JEGS Cylinder Head for GM LS1, LS2, LS6 Engines [Cathedral Port] 514055 parts at JEGS. The 799/243 will kill what little compression you have now unless you mill them. Either head is a considerable improvement. In stock Nov 2, 2011 · 243 on a 6. Cfm . We have a great online selection at the lowest prices with Fast & Free shipping on many items! Get the best deals for Ls1 243 Heads at eBay. 7L & 6. The cathedral heads use a "heart" shaped chamber where the square port heads use a "butterfly" shape. stock 6. 6 exhaust valve? News Heads CNC Tech Manifolds Billet About Services Contact< Heads FAQs What LS heads are best? GM created the LS6 to outperform the LS1, which was successful in its goal, as demonstrated by the “243” casting being reused in the LS2. Pump gas pulls were the best on tq vs av gas but same hp. * Aug 16, 2006 · 05 LS2. Cathedral Port These came factory on the LS2 HSV engines. A proper performance multi-angle valve job is definitely in order. ), it is difficult to improve upon the power […] Jul 21, 2025 · GM LS1 LS2 LS6 Gen IV Rebuilt Cylinder Heads #243 w/ Rocker Arms PAIR OEM $769. The Lingenfelter CNC porting procedure is a computer controlled machining operation that duplicates exact details from a finished Lingenfelter hand ported cylinder head. 99 Buy It Now Jan 23, 2013 · Generation III External Engine - LQ9 243/799 vs 821/823 heads? - I sort of asked this question in the wrong forum. These 243 Cylinder heads are High-Performance replacement to GM 243 heads. OUR PRIORITY IS TO MAKE SURE YOUR HEADS ARE DESIGNED TO SUIT YOUR NEEDS. Apr 30, 2010 · srry to thread jack OP, ive already got a fast for the 243 heads and dnt feel like buying a new intake or to get the l92's, how much can i get out of the 243's with the mods ive got in my sig. These heads come bare, allowing for customization with your preferred parts. I know that AFR, ETP, PRC, TrickFlow, and other aftermarket heads are the better, more reliable way to go because of the thicker deck, but are any of you pushing maybe 700+ rwhp with 317's or 243's??? If I can get away Heads & Cam PackagesHome → Heads & Cam Packages Heads & Cam Packages Add 100+ horsepower to your GM LS or Gen 5 LT engine with a Texas Speed & Performance cylinder heads and camshaft package! Our packages will include cathedral port, square port, and rectangular port cylinder heads to accommodate LS1, LS2, LS3, L99, LS6, LS7, LSA, LQ4, LQ9, L83, L86, LT1, and more! All packages will include Aug 31, 2020 · The LS2 has the same squish distance with the same head casting and tolerates 10. They only have the valves and springs on them and I'd like to replace those. 7, and 6. 57 valves and valve job technology developed and used in the TrickFlow 215cc head this head has awesome mid-lift airflow. Designed for cathedral port heads (243, 799, 317, 241, 853, 806), these valves enhance performance and durability. There are very few shops that port heads well, with AI being the best around. Im pretty comfortable were im at with them right now. Product Description Tremaniac Racing LS2 Heads | CNC Porting | 330cfm @ . 800" When only the best will do, LSX Performance Parts have teamed up with the best CNC Cylinder Head porters in the country to provide you real instant Bolt On Power! Nov 21, 2023 · The Ultimate Guide to Choosing, Installing, and Tuning GM 862 LS Heads for Big Power Gains on 5. They are frequently known as LS6 heads. 7L, 6. I understand places such as AFR can do this and custom grind a cam to match. Are 317 heads better than 706 heads? The 317 heads can flow up to 20 cfm at specific lift points more than the 706 heads. CNC ported, Dual 660 Springs, Titanium Retainers, and Performance Valve Job . 660" Spring Kit On Sale: $ 1,799. In the case of the LS3 and (especially) LS7, the factory heads offer exceptional air­flow. The Ultimate head if your are chasing throttle response and mid range power gains (power where you use it) Bigger intake and exhaust ports than a 241 head and smaller combustion chamber to bump up th Get the best deals for Ls6 243 Heads at eBay. Oct 29, 2025 · Find many great new & used options and get the best deals for GM LS2 LS6 Gen III Gen IV Cylinder Head 243 Assembly SET at the best online prices at eBay! Free shipping for many products! The big-block V8 doesn’t have a mechanical relationship with the 2001 LS6 engine with the 243 heads. 56" valves 50* seats, whitener 4150 carb. Fits 243, 799, 706, 862, 317, and other cathedral port heads on LS1, LS2, LS6 LS cylinder heads have also changed and mostly improved over the 20+ year history of the LS engine. Get the best deals for Ls 243 Heads at eBay. How much addt'l h/p can I expect if i get the heads ported ? Oct 12, 2020 · AFR's new Enforcer cylinder head for the LS1 engine packs plenty of power for a small price. I posted a question about my LQ9 build but placed it in Internal Engine forum by accident (noob!). 3 Chevrolet / GM cylinder heads. LS6 243s (CNCed) with sodium filled valves flow a little better at 280 on the intake. 00 Add to Cart Quick View GM 243 heads are General Motors’ 3rd generation cylinder heads designed for V8 trucks, SUVs, vans, and performance applications. I have a base ls1. 300 223 . Jul 24, 2024 · The 5. 99 Free shipping 05-07 Silverado Sierra 1500 L33 243 Cathedral Port Cylinder Heads Pair 5946 Get the best deals for 243 Ls Used Heads at eBay. Redirecting Redirecting May 24, 2016 · When driven hard, engines need coolant pressure to "scrape" the steam bubbles that form on hot spots in the head off the wall of the passage. 261 Mar 21, 2014 · I've seen heads in person from a major LS cylinder head manufacturer be done this way. I'm Jun 22, 2021 · Working with the intake and camshaft, the cylinder heads are part of the trio of performance components that dictate the power output of the engine. 08/1. 0L Gen III / Gen IV Cylinder Heads Assembly. 5:1. Feb 10, 2009 · No. Outlaw Race Engines CNC Ported LS 243 Cathedral Port Cylinder Heads Ls243 Core charge of $300. See if you qualify at checkout. Best CNC Ported 243 Heads and LS 799 Heads for Sale at AlliedMotorParts. Get your best LS1/LS6 CNC Ported 243/799 Heads for the Engine today at the best price. We have a great online selection at the lowest prices with Fast & Free shipping on many items! 706 5. Let’s dive into the details and see if we can discover the best heads for your build. 7 241 01-03 aluminum center bolt 5. Designed using the same 2. From F-body to Corvette, Sierra to Silverado, G8 to GTO, we carry everything for making power with your LS or Gen V Ride! Unleash peak power with CNC ported 243 heads. You can get a whole L92/L76 swap kit for about $2100. It was formerly used in the C5 Corvette but has now been ported to the LQ4 and LQ9 for truck requirements. If I could see a flow chart for the original LS2 heads (243) it would be of great help. GM Performance Parts for the lowest prices on the web. Jan 12, 2014 · I recently fell into a set of 823 heads or "LS3" square port heads that I ported. * With all 4 ports open, there's not enough pressure locally (in the head) to promote proper heat transfer unless you run your overall coolant pressure extremely high (30psi or so). Sep 1, 2017 · The LS6 also received better (243 castings) heads, a slightly more aggressive cam, and a much improved intake manifold. LSX Performance Parts. I Is 400$ a good price on a set of used #243 heads? They came off a LS2 GTO with 38k on the clock. 7 (some late MY00 cars got 241 castings) 243 04 up LS6 aluminum center bolt 5. There are multiple methods of obtaining a set of LME CNC ported heads perfectly sculpted for your Best CNC Ported 243 Heads and LS 799 Heads for Sale at AlliedMotorParts. Jan 1, 2025 · Picking the right cylinder heads can make or break your engine build, especially when balancing compression, airflow, and cost. The stock heads have a combustion chamber volume of 61. 625" ish lift. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Apr 26, 2020 · C5 Tech - Advice on 243 heads build - Hey All, Hope everyone is doing well! I cleaned my garage this weekend and got excited about starting a new project. * Part # : 799 also fits 243 casting * Description : Stock LS Series 4. Dec 25, 2017 · LS1TECH - Camaro and Firebird Forum Discussion LS1-LS2-LS3-LS6-LS7 PERFORMANCE Generation III Internal Engine 706 Heads Rule?! (706 vs 241 vs 317 vs 799/243) Jun 29, 2023 · As mentioned about the LS 823 heads specs, its bigger intake port owns a 70cc, whereas the common 243 L6 cylinder heads have basically a smaller volume at 64cc. Some say Get the best deals for 243 Ls Heads at eBay. While 243 heads excel in high-speed applications, 799 heads offer better fuel economy and efficiency. 6 valves. Is it possible to machine for a larger than 2. Nov 4, 2024 · Bare Cylinder Heads: Ready for installation of valve train components. 2 with 243 head - Looking at picking up a forged 408-416-429 ls9/ls3 block will my 243 heads and stock exhaust manifolds, steam pipes , s/c and all that hook up well? Having it built 24x to make it easier. 0L * Specs : Combustion Chamber Volume: 64. The 317 and 243 heads, both part of GM’s LS-series lineup, offer unique strengths for different Lingenfelter 243 casting LS6, LS2 cylinder heads are precision CNC machined in-house to ensure that exact tolerances are maintained. All factory mounting points with the Performance of the 243 port for 5. Jul 16, 2007 · 6. 0 liter V-8 cylinder head casting 243 only you must have an exchange with the exact same casting number. Upgrade your LS engine with Michigan Motorsports' 2. 0L Gen III / Gen IV Cylinder Heads Assemblies. Discover LS6 LS2 Cylinder Heads casting 243, designed for 5. 7 or 6. sv intake, 243 heads ported reasonably well with 2. It performs on par with most aftermarket heads. 3L, 6. However Aug 2, 2010 · I'm looking to install a set of 243/799 heads on my 5. I already know that I need to mill the heads . The Enforcer provides plenty of flow for NA applications looking for more power. They are at the roughed stage, waiting on my roll kit. LS1 CNC porting service (Customer Suppled Cores) $1,149. 0 truck heads (casting #317) are popular heads with the forced induction crowd, as they are basically the same as 243 heads, but with larger 71. 06cc chamber size, which lowers compression when used on a LS1/6 engine. Both options are significant improvements over the LS1 from the previous generation. HIGH PERFORMANCE Best LS2 243 Cylinder Heads upgrade, DRP GM LS1 LS2 Cathedral Port 243 Heads are a high quality product for a best price. 67 243 or 706 heads? On my last post I asked if the LS6 heads and intake would fit on my 2003 4. 8L truck engines. You can not achieve these numbers by porting 241 heads. hotrod. The heads have undergone only minor revisions since their introduction in 1997 , most notably a switch from perimeter to center valvcover bolt configuration for Dec 2, 2022 · As compared to other V8 options, LS1 243 heads and LS1 ported heads are lightweight and compact in size, but they still deliver unbelievable power. Apr 1, 2014 · my home ported 243 heads how to improve ? by WHEELSONLY » Tue Apr 01, 2014 5:38 pm 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. The LS engines designed with 799 heads were 5. 007" to lose 1cc of volume. Question i've got is whether to spend the money on porting my 243 heads or go aftermarket, full bolt ons custom grind cam 600plus lift 4000 stall any suggestions? HIGH PERFORMANCE Best LS2 243 Cylinder Heads upgrade, DRP GM LS1 LS2 Cathedral Port 243 Heads are a high quality product for a best price. We use your 243 or 799 castings and give them the Full CNC port job, Custom Mar 29, 2024 · The 243 heads were installed on the LS engine, which was produced from 2001 to 2006. These cylinder head's casting numbers are: 243 ONLY! THESE HEADS ARE THE SOUGHT AFTER 243 CASTING NUMBERS ONLY THIS IS FOR A PAIR HEADS! DETAILS Heads are thoroughly cleaned and inspected Pressure tested to ensure no cracks or leaks Guide work performed / replaced with new guides as necessary Valve job / performed on Serdi Aug 4, 2025 · $849. IF you use a std LS1 cam, no mods are required. com, the official website for Hot Rod Magazine. add a nice cam for good torque to compliment the truck intake (depending on vehicle it will be in) and you're looking Aug 3, 2022 · The 823 head for LS3 engines scores highly in performance, price and flexibility. This listing is for a pair of used 243 port LS cylinder heads. 3L HEADS vs 241, 799/243 vs 317s. This listing is for a rebuilt GM 5. 7 ***These castings were also used around 05 in truck applications*** THERE ARE PLENTY OF GENERIC HEADS ON THE SHELF AT BIG NAME STORES. The 243 Head is one out of the seven different versions that General Motors produced for the LS engines. We ran the 706/862 Dec 22, 2017 · We test a number of stock LS heads and came out with some very surprising horsepower numbers that will turn the internet speculators on their head. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Apr 2, 2020 · We dyno test a 6-liter LY6 LS engine with three stock-style cylinder heads from EngineQuest and a camshaft from Comp Cams. 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. A thorough porting and millimg job plus a valve upgrade on these will really wake up your engine. 0L, LS1 and High Performance LS Motors. I know there are other options, but Aug 16, 2023 · 241 vs 243 Heads: There are three main differences - the size of the combustion chamber, the port shapes, and the hollow, sodium-filled valve stem. 0L. See full list on alliedmotorparts. While they are similar to 2004 LS2 heads in terms of triangular casting, they do not require cleaning like the 243 heads. Sep 25, 2020 · GM Factory LS-2/LS-6 Stage 2 PortingOur most powerful CNC ported factory casting for the LS-1 Engines, the Stage 2. 550" stainless exhaust valves from Michigan Motorsports. Even in as cast form the GM LS cathedral castings are capable of producing impressive power levels. 45cc Intake Port Volume: 210cc Exhaust Port Volume: 75cc Intake Valve Diameter: 2. Strengths of the LS1 Engines Dec 24, 2017 · We test a number of stock LS heads and came out with some very surprising horsepower numbers that will turn the Internet speculators on their head. mfrd exz yatc zqm kmxv hycc ioqgw owmij bcmu tfohfk qfkxc slwi ljcfzj alye iaqp