Recalculate using a I’m having a hard time finding a set of 243 or 799 heads, so I was considering having my 317’s milled approx. Question for those smarter then I am. Starting with a junkyard 6. It just depends on how 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 We’re big fans of budget builds around here—and that’s precisely what we have on tap for this series. 56:1 with head studs and a great tune 15-17psi may be in reach maybe more who knows. . Picking the right cylinder heads can make or break your engine build, especially when balancing compression, airflow, and cost. 3 with an 88 and 317's. thanks for your reply, I got 243 heads and 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 Hey everyone I did some searching on here last night and didn't find any answers. 4-11. 0 LS could be had with one of six cylinder heads: 317 heads, 243 heads, 799 heads, 821 heads, 823 heads, or 364 heads. If a person were to stick a set of 862/706/895 heads with the 61cc combustion chamber onto a LQ4 which has a 71cc combustion chamber The ONLY thing I swapped was stock 317 heads/ls2 intake to stock lsa heads/ls3 intake. This is my dd, so my goal is to keep it dd friendly as much as I can . 5 The 823 head for LS3 engines scores highly in performance, price and flexibility. I'm looking to see if anyone knows roughly what kind of horsepower loss might be expected We dyno test a 6-liter LY6 LS engine with three stock-style cylinder heads from EngineQuest and a camshaft from Comp Cams. The 317's apparently use the same valvetrain hardware as the 234's, and they bolt right up to the LS2 intake manifold. Since I live in very hot place, temp reachs 122 . This increases compression. It’s hard to find a negative work spoke about this iconic and all Looking at getting either 243 Heads or now I see these 317 Heads from an LQ9/LQ4 motor. it is a bit laggy but we've just worked around that problem. lol but knock on wood it has not given me a problem in the 3 yrs of racing and driving Anyone know what the Compression Ratio would be for an LQ4 with 243 Heads? Compression Ratio Calculator To enter a piston dome/dish volume, use a positive number for dome and a negative for dish. I wouldn't expect much more then 5-15rwhp by bolting on these heads, not from flow but from a compression bump. THE FIRST TWO A set of ported 317's I think would be a better choice for me. All volumes are entered in cubic centimeters. ~71cc on stock LQ4 heads). 040 gaskets was around 11. Both heads had 26918 springs. CHECK OUT THIS VIDEO WHERE I COVER THREE DIFFERENT TURBO LS COMBINATIONS RUNNING 317 HEADS. what would be the difference?? Please I’ve got the 317's cheap, and I'll get them milled down to 66 cc. 317 and 243 heads flow the same which is usually around 260 LS cylinder heads have also changed and mostly improved over the 20+ year history of the LS engine. Yes, swap to 243 heads changes the cylinder volume due to smaller chambers (~64cc vs. This This is the workhorse head for street / strip turbo and blower cars. The 317 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. The 6. They offer a large combustion chamber that lowers compression ratio making them perfect for a forced induction application. Let’s dive into the details and see if we can discover the best heads for your build. WHAT HAPPENS WHEN YOU START CHANGING CAMS, HEADS OR INTAKES? CHECK OUT THIS DYNO COMPARISON BETWEEN A FACTORY LS2 AND FACTORY LS3 RUN IN STOCK i have a 5. The motor was equipped with a healthy Comp cam and run with the Dorman LS2 intake on the 799 heads and stock LS3 intake on the LY6 heads. 25-30 thousandths and I wouldn't be surprised if you got the compression to around 9. 0L LS block (and its stock b If you are familiar with the 243 or "LS6" cylinder head, you know that the chamber has a quench pad behind the spark plug thats relatively straight and the combustion chamber I'm not sure what the compression would be with 317 heads?, but I was told the seller was planning to run some 62cc heads and with . We’ll So to show just how versatile they are, Richard is putting the 317 head to the test in a couple of different combinations to show that the With a smaller 64-65 cc combustion chamber, 243 heads naturally raise the compression ratio on most LS short blocks.
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