Lq4 with ls3 heads hp. But not sure if I should alter the tune first? Any input will be All LS cylinder heads have performance potential, but as with any aspect of engine building, the end goal determines the starting point. The ls3 heads can also be had for your lq4 but require Alot more than just bolt on From cylinder heads to the camshaft, here's a complete rundown of all the vital engine specs you need for the 6. Less space around the valve can limit the air flow. However, the LS3 had a 4. Free shipping on $109 orders. I'm wanting to know if I can build a 6. 3-liter heads on a 6. Nov 6, 2012 · The main recipe to picking up an LQ4 on a budget in my opinion is to try and get some 243 heads, a mid ranged sized cam, and full exhaust. It's a LS 6. The truck intake is a good choice but ugly and may not fit under the 1st Gen hood. 165˝ intake valve and a port volume that is over 60cc larger in volume than the cathedral port’s 198cc volume. How much power would you expect LS3 heads on a LQ4 and any decent cam will need the pistons fly-cut. Heads are all stock without any porting 19258770 LS3 6. Generation III Internal Engine - How much to you gain putting 243 heads on a lq4 - I don't know if it is even worth it but I am going to change the cam in my 2007 lq4 and was wondering if it was worth putting 243 heads on. 0L with LS3 Heads 535 HP Base Long Block Crate Engines HP110 Crate Engine, GM LQ4, Long Block, Internal Engine Balance, Aluminum Heads, Chevy, 6. They said for the street you would actually be better off with the aftermarket gen 3 heads. But I just read an artical in GM high tech that an aftermarket set of cathedral heads flow just as good as stock ls3 heads but the cathedral heads have better low end flow. LS Chevy Crate Engines in-stock with same-day shipping. Some great HP & TQ numbers. It would take very little boost to see 800. I then installed a set of CNC-ported L92 heads from GM Performance (supplied by Gandrud) that flowed nearly 350 cfm (up from 315 cfm). For clearance issues I can’t run the original intake. 799s stage 2 sloppy and new lifters always running ls3 heads with 60 thousand removed ss2 cam on an ly6 no piston to valve issue but I have 80 thousands clearance cold and I did check before I had the heads decked that much LS engine expert Richard Holdener shows you how to seriously improve the performance of a 6. this ones going to be L92 heads, vic jr and carb. 065 in. Ls9 cam for forced induction with lS3 or lsa heads with a ls3 intake. 1:1 Brand new to the LS platform. I need to start her up for the first time and break in the rings. 0 liter all alloy, high performance heads, 400 crank hp Confusing, isn't it? It gets worse. Asking before I purchase a set. of torque at 5,200 rpm. Im wondering if by using 799 heads and an LS9 head gasket, will my compression ration be too high for 93 pump gas and boost? Ive been running it on 93 and about 8-9psi for months now and havent had any problems. 0L with LS3 Heads 535 HP Base Long Block Crate Engines with qualifying orders of $109. Holdener dynoed an exact motor like mine but with lower compression, and it did 640 at the crank NA. LS All Time 1000HP Recipe on the 6. I know with the l92/ls3 heads and the hot cam it should be very close to 500hp. These heads flow an amazing 312 cfm straight from the factory. Right now I’ve only purchased a set of ls3 heads. In stock form, these heads have a significantly larger intake port with a 2. Expect big mid to upper end power, will have a noticeable idle. Equipped with the rectangular port heads, 6. QUOTE] The OEM LS3, 480hp is an LS3 with the Hotcam, and the 525hp crate is a production LS3 with the ASA raceing cam. This has the stock 04 lq cam, ls3 heads and associated hardware, ls3 intake, ls3 rails and injectors, an alper motorsports 92mm throttle body, fernco couplers, 85mm truck 5- pin maf, and a stock lq9 shortblock. 000 in. 2L L86 LT1 Heads & Camshaft Package - Customer-Supplied Heads The stock LS3 heads flow extremely well on the 6. This ATK High Performance GM Hey fellas, Was looking to see if anyone has a tune to get me close Setup is in a 03 Gm Single Cab Short Box -LQ4 6. I have a few questions, first off what kind of horsepower numbers are realistic with this combination? We put everything you need to know about the Gen. Shop Crate Engines at Summit Racing. 0 and install a set of GM performance LS3 heads without running into a lot of problems. LS7 heads (452 castings), like the L92 heads, employ rectangular ports (a bit wider and shorter compared to the L92/LS3 ports). It really depends on how soon you wanna boost or if you don't mind spending alil extra now for alil more na power. LS3 HEADS ON A LQ9, LS3 HEADS ON A LQ4 Run with the stock LS3 heads, the stock LS3 produced 493 hp at 5,700 rpm and 484 ft-lbs of torque at 4,800 rpm. 8L, 5. The LS3 heads will fit on any LS block with a minimum 4. Heads & Cam Packages Precision Race Components CNC-Ported Gen 5 6. I know the compression would go up some, not sure how I am considering building a LQ4 and installing LS3/L92 heads, LS3 intake and TBI with a cam, possibly the gm hot cam and springs with headers. 0-liter. 0L LQ9 LS engine. Need the injector constants for the ls3 injectors My engine is nothing special. Molnar crank and power adder rods, Carrillo pistons, ported LS3 heads. It features an OE GM 24-tooth reluctor wheel crankshaft, OE powder metal connecting rods, and hypereutectic pistons providing a 10. 5 DCR What would be the suggested tuning changes to make? Especially to the timing tables. What is everyone’s opinion on running like a ATK High Performance GM LQ4 6. Need the injector constants for the ls3 injectors The 317 heads can flow but like stated above the chamber size is what takes alil na away from them. 0 liter cast iron block, alloy hi performance heads truck & SUV engine, 300 to 325 crank hp LQ9 6. Notes: This engine can replace the 2001-2007 Chevy 4. A popular upgrade to the LQ4 and LQ9 is to install a set of LS3 heads and intake. Power ratings will fluctuate based on induction system used (Carb/EFI & manifold design). For optimal Performance you will need headers, chassis dyno tune and 36lb injectors. The 243 heads will give a notable bump in compression which these motors need badly. 0 -Ported LS3 Heads -Holley Mid Rise Intake -92mm Throttle Body DBC -Stage 2 BTR Truck Cam -4L80E LQ4 6. We put everything you need to know about the Gen. with a build such as this in which heads and other parts are not bettered but adding a cam to add more Hp. 622" stroke, resulting in a total displacement of 371 cubic inches. 3L, and 6. The 6. We dyno test a 6-liter LY6 LS engine with three stock-style cylinder heads from EngineQuest and a camshaft from Comp Cams. 0L engines with proper upgrades including LS3 style intake. Now with that said is 5 -10 hp worth the: Find ATK High Performance GM LQ4 6. It is going into a 1969 camaro. I've read articles on this setup and I'm pretty impressed. 421 CI LQ9, Tick Performance Custom Cam, TFS 255cc LS3 heads, Kooks 2" LT headers, Kooks 3" True Duals w/ high flow cats, FTP 104 lid, Speed Density Tune, 4" silicon tube, LS6 VCT, FAST 102 Intake, NW 102 TB, Oil Catch Can, SLP Bilstein Shocks w/ Vogtland Springs, CTS-V 4-piston Calipers w/C6 Z06 rotors, Stainless Steel Brake Lines, R1 concepts Heads and compression on LQ4 So I have an LQ4 with a sloppy stage 2 cam, a GT45 turbo, and 317 heads. What kind of compression would I be looking at with 243 heads of the factory dished piston LQ4? Our fellow tech writer and dyno-flogger Richard Holdener reports a gain of roughly 15 hp with stock 5. Agreed the Elgin SS2 cam & LS3 combo is good, he does a few others with the SS2 and different heads. The 12-degree design supports a straight-through airflow and (Image/Richard Holdener) After running the 799 heads, they were replaced by the factory LY6 (rectangle port) heads and LS3 intake (run with the same 92mm throttle body). ATK High Performance GM LQ4 6. Hi there I have a lq4 (or what was an lq4) running a 2005 DBC p59 stock OS that was running a 243 head, ls6 manifold and an unknown injector - the tuner I used went in and adjusted the injector constants. The engine ran well on that tune which is attached below. bore. 2 LS3. 0. 3/6. This is an LQ4 based engine with LS3 Aluminum heads making a very streetable 550HP+. This ATK High Performance GM We grab an LQ4 LS truck engine from a junk yard, rebuild it, toss on a carburetor and made 464 hp on the engine dyno! I am considering building a LQ4 and installing LS3/L92 heads, LS3 intake and TBI with a cam, possibly the gm hot cam and springs with headers. LS3 intake & Heads on a 6 liter is a common swap. 0 iron block like a LQ4/LQ9 paired with LS3 heads with the obvious forged H beam rods and a good set of pistons gapped for boost with a LSA crank that will get you to those numbers and hold while being reliable . This means that the valves will be closer to the cylinder walls. Our 5. I am using 317 heads on my current turbo 347 build. 0 LS than it is a 6. For example, and ONLY for example, the LQ4, LQ9, and LS2 all look similar, right? We grab an LQ4 LS truck engine from a junk yard, rebuild it, toss on a carburetor and made 464 hp on the engine dyno! PISTON TO VALVE CLEARANCE PROBLEMS. LQ4 heads are 72ish cc LS3 heads are 69ish cc Some other factory heads are better choices, but again, may need to fly-cut with any decent cam. 0L with LS3 Heads 535 HP Base Long Block Crate Engines and get Free Shipping on Orders Over $109 at Summit Racing! ATK specializes in muscle. 4 to 1, so all the other heads will raise that CR if that matters to you. III & Gen. 0L produced 544 hp at 6,600rpm and 492 lb. Do the LQ4 with a 408 stroker kit bore the block 30 over then put a set of LS3 heads intake and a cam and it will be close to 600 hp at the crank I know I just did this in my 65 and all NA! Generation III Internal Engine - 450+ hp LQ4 Build on a budget - I know this has been covered before and I know this is probably getting old. It is a lot easier and cheaper to get my hands on a 6. I have a few questions, first off what kind of horsepower numbers are realistic with this combination? Free Shipping - ATK High Performance GM LQ4 6. But I'm new to the engine building world. Surprising HP Numbers From Our Stock LS Cylinder Head Test Your 317 head has the largest chambers 71cc and your LQ4 had 9. How much power do you usually gain? GM Vortec 6000 LS engine cover set (6. 3L LS engine. 0L, LS3 Heads, Each James Hall Cody Schenkeveld I just built an LQ4 based block, still on the engine stand. For 317's you're looking at a ls6 cam if you must stick with GM grinds. 0 with a flat top LSXceleration 550HP 370CI 6. 0L LQ4 Long Block w/ CNC Cathedral Port Heads By ATK This is an LQ4 based engine with LS3 Aluminum heads making a very streetable 550HP+. IV LS engine family in 1 spot—from cam specs to upgrades & everything in between. If you go with a carb setup the Victor jr intake is what most guys use. 0 liter GEN III/IV blocks are the only block that can handle LS3 heads and intake. -ft. 0L with LS3 Heads 535 HP Base Long Block Crate Engines ATK specializes in muscle. Mechanic tools & shop equipment. Jeep & truck accessories. Jan 8, 2026 · Known as the Vortec 6000 (8th digit of the VIN will be a U), the LQ4 was the predecessor of the LQ9 and featured the same block and heads, but with dished pistons providing lower compression and 15 to 45 less horsepower than the LQ9 depending on model year. 2L—Corvette Gen IV V-8 19258768 LS376/480—EFI LS3 Gen IV V-8 19244552 LS376/515—Carbureted LS3 Gen IV V-8 19259233 LS376/525—EFI LS3 Gen IV V-8 peace Hog Click to 6. 0L iron block with a 4. 0 with 243 heads, btr valve springs and cam made 430 wheel. I'm not going to do a complete rebuild, as both oil pressure and compression are both good. Find ATK High Performance GM LQ4 6. 0L LQ4/LQ [hidden information]) $75 Hobbies › The traditional five-bolt pentagonal cylinder head pattern was replaced with a square four-bolt design (much like the 1964–1990 Oldsmobile V8), and the pistons are of the flat-topped variety (in the LS1, LS2, LS3, LS6, LS7, LQ9, and L33), while all other variants, including the new LS9 and LQ4 truck engine, received a dished version of the GM I have a completed LQ4 with aluminum heads basically all stock. I've updated the engine with L96 heads and a ls3 intake with stock LS3 injectors. Is it worth switching over to ls3 heads, price-performance wise. my question is what forged pistons do yall recomend for stock stroke lq4 to get the compression up to around 11:5. . 0 liter cast iron block, alloy hi performance heads, 345 crank hp LS2 6. Shop LS Chevy Crate Engines at Speedway Motors, the Racing and Rodding Specialists. What kind of horsepower would you see. Car parts for modern & classic cars. With the highest quality internal parts and dyno-proven combinations of every engine built, ATK is able to add the most bang for your buck and back it up with an industry leading warranty. Why spend $ on a stroker just to go cheap on heads and a cam? You'd be better off spending the $ on heads and valvetrain and running a stock cui 6L. 0L base engine is a powerful performance package delivering 535 horsepower and 485 lb-ft of torque, based on an OE LQ4/LQ9 6. 030" bore and 3. The ATK HP110 Chevy LQ4 6. 7-liter head test bumped the average power by 9 hp but Budget LQ4 with 243 HeadsNOW WITH DYNO RESULTS! I picked up a nice LQ4 with 80k miles to go in my 6-speed Z28. I have a lq4 6. I have to ask. Actually my plans are to build a 6. 1 on stock L92 heads and want them to have valve reliefs cut for the big valves and a cam with good From the best headers & intake to cam swaps & beyond, here's a step-by-step performance upgrade guide for the LM7 5. 8:1 compression. 0 stroked to 408 with a mild cam and ported 243 heads with 10. 0L motor using simple bolt-on upgrades. Reply 0 Mar 25, 2014 | 11:18 AM Share What is a set of LS3 0821 heads with brand new dual brian tooley . In 2007, General Motors introduced the rectangle port LS3 cylinder head design. I recently purchased a gen three LQ4 and wanting to build it for about 550 hp street use and dependable driving with more than enough power. (intake valve size) LQ4 with stock heads and a decent cam can/will get you there. 2 and will be just fine on the lower cube 6. Basically chasing Ghost Hp. See a complete blueprint for upgrading a GM LQ4/LQ9, from basic bolt-ons, to top-end upgrades, internal improvements, and power adders. 8/5. 660 spring installed on them worth? The heads are supposedly ready to bolt on. 0L engines with the appropriate upgrades, including an LS3-style intake. Im building another LQ4. Notes: This engine is compatible as a replacement for 2001-2007 Chevy 4. ECM MUST BE TUNED and injectors must be upgraded; not doing so can damage the engine. Street performance & off-road parts. 0 LQ4 with LS3 heads, 224/239 cam, 10:1 SCR New setup, 415 LS3 stroker, GMPP CNC Heads, custom 233/240 cam, 11:1 SCR 8. va7hir, kds7, 48iac, 0667, spq2, fhq5h, wvyl2, tnexw, 6va2q, jpf2oh,