- 241 heads on lq9. 0 LQ9 2004 Engine Size: 364 c. 000 in. 615. It’s possible to push 1,000 HP from a 6. 575 220/224 112 LSA cam 1-7/8" headers w/ 3" mandrel exhaust 3. We also offer valve spring upgrades. 3/4. The runners are 241=200cc , 243=210cc . For $1500 exchange, $1800 outright. A true boost-oriented grind will be the best cam in the long run but run less than great without boost. 0-liter. This engine sports aluminum cylinder heads, which help reduce its weight and boost heat dissipation, improving performance and efficiency. 5cc chamber. 3-liter, and even some 6. I'm still running these heads on my 408 stroker and it pulls hard as hell to 7,000 rpms Sep 7, 2010 · SCOTTY X. 050" Tappet Lift. The distinction was more evident in the compression ratio and piston design for the LQ4 vs. Compression Ratio: 10. Cathedral-Port Heads. 67cc. 5:1. The 243's flow better than the 317s and have a higher CR. Head: 1997+ LS1 5. Camshafts. Realizing it will be NA temporarily, you probably want to look at a split cam with low overlap. 0 SBE 821 LS3 heads Stock LS3 intake/inj w/ 92mm TB. 9. I was wondering if anyone knew off hand what intake I can throw on WITHOUT changing the heads. LS6 Heads, Casting #799 (Originally developed for the ZO6) 9. . 0 stock bottom end, now my question is what should I go with for heads and cam ? Jun 9, 2023 · A single turbo LQ4 build is actually pretty easy on the wallet though, just make sure you have the fuel system and other bits to support it. I currently have a Chevy small block 383 with a stock block, AFR heads, and a 6-71 blower. I created an Excel chart (and graph) for a number of 241 and 243 data. On the smaller 3. 600 liftTexas Speed 225 heads 68cc chamber Injector Clinic 58 lb/hr injectorsEarleyCustomsBob'sGarage Jun 12, 2023 · The 799 heads are superior to the 243 heads for automobiles because it is more efficient. 496CI Edelbrock Heads, Quickfuel Carb, LS6 Intake. 0L? What is the bes May 19, 2014 · 9819 posts · Joined 2011. 581 115 LSA. Material: Aluminimum. 95. Goals for truck: mid 12s. 300 then 243 increase to where there is about 10% more flow. ohh yeah the 317's will go on the car at the same time as the cam. Gotta love the aluminum head/iron block combo. Last year I got my blown 383 put together and running in my boat with a ton of help from this forum. ANd they even have a swap out for your exact 317 head 250cfm to just over 300cfm. 000"+ bore engines with cathedral port intake manifolds. 0 truck (LQ4 or LQ9) or LS2 (243 castings) with the rectangular-port LS3 heads. Honestly you can't replace displacement, and building the 408 would be the best bet IMO. PRC 237cc CNC Ported Cylinder Heads $ 2,709. Disable Cat Over Temp Protection or the extra fuel will cause tuning issues. 0 will make about 300-340 HP. Aug 3, 2022 · The 823 cylinder head has a chamber of 65cc (cathedral style ports) or up to 70cc with the more commonly encountered rectangular ones. Hence a higher horsepower is generated compared to that of LQ4. Aug 27, 2020 · Top 5 Ways To Waste Money On Your LS Engine Swap. 3L/LS1/LS2/LS6 Cylinder Heads Fully CNC Ported & Assembled With Choice of Your Stock or Stainless Steel 2. 5:1 Connecting Rod Length: 6. If not pulling the heads I would leave the 241 on . These heads can be CNC-ported to improve on flow and milled for higher compression. 00-inch bore. i. Last Words. 8L/5. 9:1 Compression. 7-liter head test bumped the average power by 9 hp but LET'S TALK TECH, ANYONE EVER SEE A SET OF STOCK 243 HEADS FLOW 270+ CFM? WE COMPARED 243 HEADS TO 862 HEADS, PORTED, CHAMBER WORK & BIG VALVE. . Designed For 5. Article also says that LQ4 and LQ9 have the same heads and block but different pistons, rods, crank and pushrods. It honestly doesn't matter than much, both heads will make 700+ horsepower with ease on enough boost. 0's the 9. 520/. Cylinder Head(s) Brand: Stock 317 heads milled . Because it has a larger capacity, the Chevy 799 heads are better than the 243 heads. Also, I'm throwing it in a 68 Chevelle. I mainly roll because I am not big on trashing u-joints, driveshafts and these brittle D44 IRS rear ends. My 403's CR is 11. We offer 370, 408, and 421 CID LQ9 packages with power ranging from 520 HP all the way up to 625 HP. 2 is pretty sweet, but I don't think I would bother if you already have a LQ9. set pe tps to 75%. Compared to its rival, the 799 cylinder head, it has more ports for greater air intake and exhaust flow, resulting Jul 10, 2010 · Join Date. LS Swap. For a street car, this design means excellent throttle response, torque and average power. 0 Iron center bolt heads 317 01 and up LQ4 and LQ9 6. 0L LY6 jumped from 443 hp and 467 lb-ft of torque to 514 hp at 5,900 rpm and 493 lb-ft of torque at 4,600 rpm Jan 12, 2022 · LS2 and LQ9 blocks feature a 4. #4 · Sep 29, 2008. It started off life like any normal truck engine. The 317 is a 243 but with a larger CC. 2,228. 3L, GM’s 6. Give us a call today to get a May 24, 2020 · FULL RESULTS-FACTORY LS HEAD SHOOTOUT, 6. 310 HP/ 5300 HO. 3L 5. Posts. 240 Deck Height. I would call Comp back and cancel your order if it is not too late. Overall, LQ9 provides a distinct performance boost over the LQ4. 2 runs. Jan 16, 2024 · The LY6 replaced the LQ9 and was among the debutants of the 4th Generation, together with LY2 and LY5. Aug 2, 2010 · Compression Ratio & Combustion Chamber Size. 0 aluminum center bolt heads 035 01 - 04 LQ9 6. Dyno tests have proven that comparable aftermarket cathedral port heads […] Sep 1, 2017 · Any intake manifold (LS1, LS6, LS2) will work with these heads as well as Vortec intakes from cathedral port headed variants. The 799 LS heads boost horsepower up to 25 hp. Casting Numbers: 12551364, 12573581, 12577184. 02/1. May fit other heads, please verify first. We specialize in high performance cylinder porting for racing applications. Skeet is running a similar duration cam with his 243's PRC As-Cast 225cc LS1/LS2 Cathedral Heads - Big Chamber $ 2,203. 2L produced 826 hp at 6,700 rpm and 771 lb-ft of torque at 4,600 rpm. 3 L33 comes with LS6 Heads: L33 Vortec 5. 0L block with supporting mods can enable these larger displacement LS engines to make 550+ horsepower. Intake Lift: . 45 . 590˝ exhaust valves. All other features are the same as previous years iron heads. 241 castings (the casting number is found near the corner of the head 799 05 and up 4. Question, can I mill heads to . 0L LS1 LS2 LS6 LQ4 LQ9. III, 6. This engine is very similar in design to the current generation of medium-displacement V8s used in GM’s cars and light trucks. 45cc chamber for more compression (10. 8's the 706 are very decent. com; 241 Heads vs 243 Heads - LS1Tech. 040" milled 241's that I did myself and they give me great throttle response and low end grunt even with my 238/242 . I'm looking to install a set of 243/799 heads on my 5. May fit other aftermarket heads, please verify first. 595/. 1969 Corvette, 427 Convertible. Compatible with OEM Casting #'s 243, 241, 799, 853, 706, 862, 317 . To produce the power these heads are noted for, the head has a very large intake port (257cc, 2. set pe enable to 0 and torque hyst also to 0. - Intake/exhaust/chambers (some chambers don’t apply). A custom grind cam may suit you best. This means that the valves will be closer to the cylinder walls. 317 01 and up LQ4 and LQ9 6. In constructing a budget 408 stroker, focusing on high-flow GM heads is a must. 5 off of LTs meeting stock SS exhaust @ stock location, gutted stock air box, 4" PVC from TB to box. A 212/216 . 0 is already 10:1 if you get the LQ9 which is simply a flat top piston (like you mention you have). On the same cam, on the same engine, the heads are going to perform within +/- 5hp/5tq of each other, it is almost meaningless. 8 Mar 24, 2023 · The LS2 cylinder heads are also acceptable for LS2 and LQ9 engine blocks with a 4. Iron heads, small cam and the old SBC crank rear flange thickness. LS 6. The 243 head is the 01+ LS6/LS2 head. Part Number: AFR-1630 5. While the 6. Mar 9, 2016 · Would 873 Cast Iron Heads Work? - LS1Tech. These cylinder heads are aluminum made, with a cathedral-shaped intake port and a D-port exhaust port. Product Description. Stroke: 3. Valve size (in): 2. I recently purchased an LQ9 with 317 heads. Oct 15, 2012 · List of current mods: 243 Heads, TBSS intake, Pacesetter LTs, no cats, 2. 00 intake / 1. 3 heads] becomes 11. In a nutshell, the LS 862 heads are the best-performing, affordable, and ported 5. 3, or 5. A slight bump in compression, but it shouldn't be an issue. Ported 241s which maintains the same cc as stock 243 are about 10% more than stock 243. com; Tips on How to Clean Up Cylinder Heads? - LS1Tech. LQ9 upgrades. 111 Degree LSA. 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. These heads are particularly suitable for turbo and supercharger applications and are compatible with 6. 0L truck motors leave a lot on the table from the factory. Resurface for MLS Gaskets + $150. Jun 6, 2018 · After running the same setup with the LS3 heads, the 6. This is the workhorse head for street / strip turbo and blower cars. 0L LQ4 LQ9 317 Cylinder Heads, Customer Supplied Bare Casting. 0-liter Truck Material:Aluminum Part Number: 12572035 Combustion chamber Volume:71. ” However, their thin cross-section allows for a high-velocity and smaller-volume runner design with excellent flow. Dec 18, 2020 · The best of the iron-block, aluminum-headed 6. Putting 862 heads on a 6. Cam is not really ideal for a carb intake, nor is it really ideal for a 408. Our go-to choice includes the L92/LS3 blocks, known for their rectangular-port heads which significantly outperform the earlier cathedral-port designs, especially in a hi-po LS setup. PRC As-Cast 225cc LS1/LS2 Cathedral Heads $ 2,203. Not sure yet. Cylinder Heads, Street Porting, Aluminum, Assembled, 72cc Chamber, 230cc Intake, Chevy, Small Block, LS1, Pair. The sophisticated architecture, cathedral-shaped port, and smaller combustion chamber work amazingly on these truck engines. Kerry Oct 20, 2020 · See All 18 Photos. Intake Manifold. There's something like an 80-100 lb weight difference though. #10 · Jul 10, 2009. Jan 22, 2015 · No modifications to do a head swap, but if both are stock untouched heads the 241s have a 66cc chamber versus the 243s 64. Engine Block Specifications. 4. I broke the snout off my crankshaft at the end of last season. On a 4. Pricing. Speed Direct Rack and Pinion, Semi Coilovers Sep 6, 2017 · Any intake manifold (LS1, LS6, LS2) will work with these heads as well as Vortec intakes from cathedral port headed variants. The 243 will give you a little more compression which is a good thing in that engine. 10 gears and th400. Personally, I'd keep the LQ9, but that's me. Richard is the guys name. Either head is a considerable improvement. Feb 10, 2009 · The 243 heads as used on the LS2 motor flow at 260 CFM on the intake. Installing LS2 Heads. 0L 317 Aluminum Cylinder Head CNC Porting Service ( Customer Supplied Bare Heads ) CNC Ported LS 6. 0 aluminum center bolt heads Even more detailed info: Casting Numbers 241, 806, 853 Feb 13, 2018 · The LQ4 and LQ9 are Gen. 3Truck heads ***reportedly came on a few corvette's too*** These are basically 243 Heads. All of our turn-key crate engines include a custom engine harness and ECM that can be built to run your electronic transmission for no additional charge! They also include a one year, unlimited mileage warranty. The LY6 engine has a horsepower rating of 364 and torque of 383 ft. 065-inch bore size and accept all of the smaller production-style cylinder heads. Spring, TX. 8-5. 1 CR), 200cc intake runners, and 70cc (round) exhaust ports. Now that you're swapping heads, you should consider getting them ported beforehand. 8-liter and 5. Aug 30, 2016 · 1968 Camaro 6. 0L truck engines was RPO LQ9, which General Motors Performance Parts (GMPP) also sold as a complete crate assembly that included just about everything Fits 1997-2013 Cathedral Port LS Heads 4. 243 cylinder heads have cathedral-shaped intake ports and a D-shaped exhaust, which helps to enhance air and fuel intake, smooth combustion, and quicker exhausting. 7L 6. Sep 1, 2009 · Long-Block Parts Total (Includes Short-Block Parts): $6,904. My goal is to use as much stock items as I can, but I hate the look of the stock truck intake. The LQ4 served in anything from bread-vans and boats to SUV’s between 1999 and ’07. Fits Trick Flow Cathedral port heads. 2001 Trans Am 5. Jun 1, 2017 · A popular upgrade to the LQ4 and LQ9 is to install a set of LS3 heads and intake. PRC 225cc As-Cast Cathedral Port LS Heads . Product Information. Bold statement? Well, not really. 3 with 243 is 9. 0 Head Questions - LS1Tech. My stock compression ratio is 9. If you don't post your tune and logs when you have questions you aren't helping yourself. Options. These heads are almost the same, but the L99 heads used a Nov 20, 2016 · There is some advantages over the 241 . Tools & Miscellaneous Total: $371. Buy in monthly payments with Affirm on orders over $50. To summarize, a stock 6. With advanced porting (such as those PRC 237cc CNC 6. 55 exhaust. It's the dished piston of the LQ4 that gave those 6. Installing LS2 heads can be a complex process that requires careful attention to detail. i dont foresee any ptv clearance issues but you need to make sure you have the right valvetrain. 7 to 6. Displacement: 6. 06cc Compression Lq9 317 heads milling question. Nov 19, 2009 · Casting Number 241. 020" Head Runner Volume: Unknown. 0L, iron block, truck engines. 56's, 14 bolt, shackle flip 13. They are often called LS6 heads. 5 toss 64. 8L. The second major difference is that the LS6 heads used hollow, sodium-filled Sep 24, 2015 · Cathedral port cylinder heads have been mistakenly dismissed by many in LS-series circles for being “old-tech. 03 without any ptv issues, looking at using the stock heads and not buying aftermarket/243 heads. Their iron 706 heads flow just 240 cfm out of the box. However, the LS3 had a 4. Introducing the BTR Shaft Rocker Kit – The Next Step in the Evolution of LS Rocker Arm Trunnion Kits Aug 1, 2009 · You've probably already figured out from the title of our story that we're going with 408 cubic inches (6. The LS3 heads will fit on any LS block with a minimum 4. 0 Liter. The gains offered by the high-flow LS3 heads continued under boost, but Jan 19, 2006 · C5 Forced Induction/Nitrous - Questions about swapping LQ9 heads and dropping compression for boost? - I was told if you swap LQ9 heads onto an ls1 you will lower the compression by about 1 point, is this true. Possible future mods: 50/75 nitrous, 4. 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. Aug 18, 2011 · 241 was used on 01-04 LS1 engines. Hello everyone. You are going to have to spend some cash dealing with either using the newer PCM or converting the crank sensor to the 0411. 007" to lose 1cc of volume. LQ9 is the RPO (regular production option) code for the 6. I prefer an iron block. Nov 27, 2006 · But no matter, your LQ9 is the gold standard of solid GEN 3 builds. All of our hand built turn-key crate engines include a custom engine harness and ECM that can be built to run your electronic transmission for no additional charge! Oct 15, 2021 · So, casting 862 heads would do favors for your car with a perfect set up. The LQ9 achieves its factory-listed 345 hp and 380 lb-ft of torque by incorporating flat-top pistons to create a Oct 24, 2023 · GM’s 243 cylinder heads are 3rd generation cylinder heads designed for V8 trucks, SUVs, vans, and performance applications. Compatible with OEM Casting #'s 243, 241, 799, 853, 706, 862, 317. 7L), which is accomplished with a 4. 0 LQ9/4L60E. 064 OD Makes about 420-430whp currently It isn't a dig car. 15570 posts · Joined 2004. You can use the 317's and have milled down to raise the CR and also have Port & Polish to raise the flow. 0L V8 LQ4 and LQ9 engine models. 575" Exhaust Valves, & Optional TSP Dual Valve Spring Kit with PAC Valve Springs & Titanium Retainers. 4,452. 5 will include aftermarket 2. Sep 13, 2009 · a ls1 is 10. 0L LQ9 truck engine, the LS7 cam is often the appropriate choice to make the most out of that engine’s larger displacement. Thanks for the info. Car is a 86 regal , 8. 59-inch diameter). Performance. You can not achieve these numbers by porting 241 heads. Sep 17, 2015 · The LS6 cam seems to be a favorite among enthusiasts, with higher lift and duration on the exhaust side when in comparison to the LS2 or LS3 cams. I would like to pick everyones brain. The flat surface piston in LQ9 ensures a compression ration of 10. Or have them grind it to a 218/224 . 0 destroyed the main bearing a little over 2 weeks ago and now that i have it torn apart i want to beef it up some. Jan 23, 2017 · Our build started out life as most 6. You do need to pick what spacing you want to run because that determines what crank pulley, accessories, and intake you need to run. 3. After that all LQ4's had aluminum heads just like the LQ9's. If you are looking for a high-performing cylinder head at an economical price, then the 862 LS heads are definitely a great choice. - Pressure tested for leak detection. 3-liter heads on a 6. 5 on a LQ9 and you get same SCR as LS2 just like a 4. 3 engines have 243 heads. LS Engine. Actually the 317 heads on a stock bore/stock stroke LQ 6. com; 6. Holley 241-265 LS Valley Cover, Trussed, Black Satin Mar 23, 2021 · LQ9 6. Designed for 4. Most cars with 4 or 6 cylinders can use the 243 heads. 8/5. Dec 28, 2011 · A Bumpstick Swap and a Set of RHS’ New Heads Make a Truck Motor Really Haul. Sep 29, 2008 · ddawson. 602" with 1. 3Truck heads ***reportedly came on a few corvette's too*** These are basically 243 Heads 873 99-00 LQ4 6. The stock heads have a combustion chamber volume of 61. 0/LQ9 Build Idea. Intake Duration: 234 Degrees at . 7 Litre Passenger Car. 0L V8 engine GM uses in several high performance truck applications. Aug 10, 2011 · 241 and 243 flow the same to . For 1k, I can't see you going wrong. 67 cc combustion chamber (10. 81 60' thanks guys. Mar 15, 2024 · The 317 cylinder heads feature a distinctive intake port shape that resembles a cathedral and an exhaust port with a D-shape, coupled with a spacious combustion chamber that produces lower compression ratios. 165-inch diameter) and an exhaust port capacity of 87cc (1. Our 5. 607" with 1. 3 325 Gen 3 Aluminun Engine Vin "B". 2016 Silverado CCSB 5. 78" bores of the LS1/6 & all 5. Valve Job with new Valve Guides + $400. 2 Liter Engines With Stock Or Stock Type Intake Manifolds and Cathedral Port Heads. 3 @ 99mph with 1. 559 107, Hedman Headers, Magnaflow Exhaust. Check out LS Engine King’s complete line of LQ9 turn-key crate engines! We offer 370, 408, and 420 CID LQ9 packages with power ranging from 520 HP all the way up to 625 HP. 8, 5. Thinking about goin lq9 6. Before getting Nov 21, 2023 · Truck guys love the results when upgrading to these heads. 1 with 67 cc heads you toss on Ls6 heads and it becomes 10. PRC CNC Porting/Machining Service Includes: 799 05 and up 4. 563/. Jun 22, 2021 · The most popular upgrade is to replace the stock 317 cathedral-port heads on a 6. The price listed is for you sending your cathedral port cylinder heads (4. 575/. 54 gear 25. They both have a 66. 0" and larger bores. 7 rockers. 241 castings (the casting number is found near the corner of the head Precision Race Components Customer-Supplied 4. According to billavista's LS engine article only the 99 - 2000 LQ4's had iron heads. I have the 317 on my car with 70CC. 0-inch bore of the 6. 19. 5-1. 50 cert , big 10 bolt 4. Other considerations involved in selecting the best cylinder head for your application include the weight of the vehicle, camshaft, intake manifold, exhaust system, transmission, gear ratio, drive tire diameter, and intended use. 1 LQ9 and LS2 are same motors minus the heads. The large valves in the LS3 heads require the 4. Mar 16, 2011 · 99 Silverado ECSB 4X4, LQ4, Patriot Stage 2 LS6 heads w/59cc chambers, TR224-112, Pacesetter LT's, Nelson tune, FLT Lvl 5, PI 3600, UD pulley, CAI, Ported Throttle body, E-fans, 6'' Fabtech lift, 3'' Summit body lift, 37'' ProComp XTerrains, 4. com 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. set your engine over temp enrichment to match your pe eq ratio (gas) while tuning then change it to something richer once you get done tuning. 6. 0Ls, with the base workhorse LQ4. Part Number: 12559853 (1997-98) 12559853 (1999-00) (not sure why same PN) 12564241 (2001-03) Combustion Chamber Volume: 66. 0 stock bottom endTexas Speed Stage 3 Cam 216/220 0. Exhaust Lift . Feb 6, 2015 · Lq9 6. Mar 16, 2021 · LQ9 6. 00. Milling 243 heads for LQ9. Nov 10, 2014 · EPS Camshaft LS 234/246. 524 115 LSA cam is small for a LQ9 crate motor. 873 99-00 LQ4 6. I have a stock lq9 with flat tops and 317 heads. Jan 9, 2022 · LS1s have 241 heads. Deck 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. 0 LS, but a great budget build will easily get you 500-600 HP. 165˝ intake valves and 1. com; LQ9 243/799 vs 821/823 Heads? - LS1Tech. 1:1. It has a smaller 64. 3 heads that will best suit your car. Stage 2. 7 LS1/M6. 243 heads are the same as 799 heads which are found on the LS2's, same block as LQ9. For larger displacement engines, such as the iron 6. we only have 91 octane gas here in Fits. 7" tire Face plated TKO 600 5 speed . 0 stock bottom end nitrous questions. I am running a set of ported and . Less space around the valve can limit the air flow. as many of you have heard my lq9 6. 3 with 241 is 8. Number of Cylinders: 8 Bore: 4. After that it depends on how intense the porting is. Jun 15, 2009 · What you need to know: The LQ4 head received aluminum heads starting in models year 2001. 00" bore of an LQ4 though it is splitting hairs. 0 heads. Machine Work Total: $925. Like the 5. Location. 241=66. The implication of this is that the LQ9 has a higher horsepower, and responds better to upgrades like high-flow cylinder heads, turbos, superchargers, nitrous oxide, and intake systems. /lbs. Rated by the factory in the low 300-hp range (depending on application and year), the LQ4 featured reduced static compression (compared to the LQ9) thanks to a combination of dished pistons and sizable 71cc chambers on the 317 cylinder heads. 595 112lsa cam. Our stage 1 porting service will include the re-use of the stock vales. 898/3. Sep 13, 2007 · Investment cast, roller trunnion. Shop Holley LQ9 Chevy LS V8 Intake Manifold and get Free Shipping on orders over $149 at Speedway Motors. That changed in 2001 when GM threw in the bigger cam and aluminum heads Feb 13, 2020 · GM's 706 Vortec heads are the cheapest and most effective heads you can use on your 4. 88 gears, hydroboost. 3L and 4. com; Budget LQ4 with 243 Heads - LS1Tech. Exhaust Duration 246 Degrees at . Rectangular-Port Heads. raise pe enable map to 80 kpa. 1 sme as 4. 5 . 0 aluminum center bolt heads. Aug 12, 2012 · The LQ9 is 100% compatible with the LS1 and LS6 as far as parts go (intake, heads, headers, cam, crank, etc. 590/. I already know that I need to mill the heads . Even more detailed info: Casting Numbers 241, 806, 853. FED heads make more power efficiently because we synchronize three critical elements. Dec 7, 2017 · Engine Block Type: Chevrolet Engine Family: LS 6. Choices abound on Jul 8, 2009 · 242 posts · Joined 2007. - Teardown/Clean/Inspect. 0-liter LS engine builds. 035 01 - 04 LQ9 6. Intake Port Volume: 200cc. A popular upgrade to the LQ4 and LQ9 is to install a set of LS3 heads and intake. Aug 6, 2020 · The 243's have bigger valves which do better on 4. 000-inch bore and accept heads designed for LS1, LS6, LQ9, L92, LS3, and LS9 engines. They are a decent head with a little bigger chamber than the 243. Nov 2008. 0 out of 5 stars Mar 6, 2013 · Vortec 6. 2L engines have a 4. Jun 9, 2023 · The LQ9 has 317 or 035 cylinder heads. ) 825hp/847TQ to the WHEELS on a stock engine is damn impressive. Sleeper S10 said: The 5. LS6 243s (CNCed) with sodium filled valves flow a little better at 280 on the intake. 0L WHO WINS? Check out this comparison between the 706, 799, LY6 and TFS 225 heads on a cammed 6. Nov 10, 2021 · The LQ9 is a better performer than the LQ4 because of the improvements in the piston style which facilitates the creation of higher output. you will need to match your valvetrain to your cam. Hi guys. 3/6L80e, not as slow but still heavy. I use only 93 oct and it is practically a daily. Fits 1997-2013 Cathedral Port LS Heads 4. 57 stainless steel valves. Mar 1, 2011 · THe l92 heads outflow half the aftermarket 6. The cylinder head features a 210cc intake runner volume and 75cc exhaust runner volume. 0L LQ4/LQ9 Performance. After installation of the TrackMax cam, the power output of the 6. 0L LS1 LS2 LM7 L33 LQ4 LQ9. So I'm on a budget this year and looking to get my regal back on the road so need help on coming up with a good budget build. Fits 1999-2013 LS-Based Engines LS2 LQ4 LQ9 408. - FED’s high performance porting via 5-Axis CNC. 5+2. 030-inch bore and 4. Straub Technologies 229/235 . #10 · May 19, 2014. 5 CR on LS6), 210cc intake runners, and 75cc D-shaped exhaust ports. The 6cc larger combustion chambers found on these trucks further increased their efficiency when compared to its Corvette counterpart. However, the popularity of the LS6 spread to other applications such as trucks with the LQ4 and LQ9 engines. 5 which is the stock LS6 motor CR just like a ls1 with 61 cc heads [5. 67cc , 243=64. The 317's are good for boosted builds. As for the swap into an E39 just ask the people who have done an LS swap. The stock 241 head flows at 220 on the intake. Total Additional Parts To Complete "Crate Engine": $2,524. 0:1 compression. 622" Compression Ratio: 10. 00-inch stroke. 0" Stroke: 3. My goal is 11. Flat topped teflon coated pistons with floating wrist pins. Jun 22, 2023 · The first has to do with port shape. I believe after 07, all 5. Fits 1997-2013 LS-Based Engines 5. 7 blocks), but the results are impressive. bore. Material: Iron. With your flat top,,,,plus an overbore,,,,plus a 4" stroker crank to reach your desired 408 cubes,,,,on Apr 15, 2022 · The LS engines with 799 heads are 5. one thing i was looking to do was mill the stage 3 243 heads that i currently have. com; 317 Heads! - LS1Tech. IMO the cheapest way to make great power at 7500rpm on nitrous with a 408 is with a LS3 casting cylinder head. I love how my 6. These 100% USA-cast and machined Precision Race Components cylinder heads combine high flowing 225cc "As-cast" intake runners with CNC machined chambers and guides for exceptional performance at a bargain price. question is i dont know how much they need to go. 0L / 364 cid. Dec 27, 2022 · It came equipped with 243 cylinder heads which were initially designed for C5 Corvettes. 8L 5. With this increased airflow comes a greater capacity to burn fuel efficiently, giving you better performance overall. Mar 6, 2008 · That cam was designed so that you would not have to get a custom tunehence the small cam specs. 99. 0 Iron center bolt heads. I'm going to be installing a btr stage 3 cam 231/244 112. 098" Intake Manifold Type: Holley 2X4 dual plane or stock LS6. 3, LS1, LS6, LS2, LQ4/9) to us for porting. 065 in. 630/. Mar 4, 2024 · Selecting Performance Cylinder Heads and Camshafts. 02" Intake Valves, 1. 4:1 compression ratio. 622 in. 035 Head: 2002+ LQ9 6. The smaller combustion chamber with a higher compression ratio offers increased power output. a 72 cc vs 64. These 100% USA-cast and machined Precision Race Components cylinder heads feature 237cc fully CNC Ported intake runners. Bore Dia. 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. 0 (and do not work on smaller 4. 0L Cathedral Port LS Heads . Additionally, these upgraded 243 heads are designed with a higher-lift camshaft so Nov 27, 2017 · Our fellow tech writer and dyno-flogger Richard Holdener reports a gain of roughly 15 hp with stock 5. 45cc. You are going to have to get those LS6 heads ported, a good shop is West Coast Cylinder Head. Learn more. $599. 15cc, and 243/799 heads have a volume of 64. Likely the 823's flow more air but then you'd need the matching intake for it. ty zv iv hi rf pu yc bj pq ts