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355 chevy compression ratio calculator12/29/2023 If you know how to tune an engine and have everything setup right you can get away with 200, 215, 220 psi on 93 octane but I don't recommed that to the avg person. That's why pickng the right cam is such a big deal.įor most people 180-190 psi cyl pressure is max for pump 93 octane fuel. Bleed off too much and you have a dog untill 4000 rpms or so.ĭon't bleed off enough and you have an engine that pings it's self to death on pump fuel. If you have alot of overlap, high duration, wide LSA, then you tend to bleed off cyl pressure. Now where the cam comes into play is with cyl pressure (amount you would see on a gauge if you done a compression test) The only things that changes the compression ratio is the. Cam does not play a role in amount of compression ratio, but cam does change the cyl pressure, DCR and if X compression can run on pump fuel. My compression is 10.34:1īefore this combo I ran same bore, stroke, gasket, deck height but a 4VR flat top piston and 62cc 462 double hump heads. I'm running wiseco 5.4cc 2VR flat tops in my 355, 4.030" over, stock. The are around a -20 to -25cc dish vol and will drop your compression down to 8.5:1 or so Those dish pistons you have are forged replacments noted for "Original equipment style replacement for passenger car engine" 038" (thinnest you can run with 0 deck height) head gaskets, with a 4.040" bore in gaskets, 64cc heads you get.ĭo not use the dish pistons on your 355. The flat top 4vr will give you too much compression for pump fuel and iron heads, and the dish will work bestĪ flat top 4vr piston will cc in at 7.5 to 9cc based on piston brand, etc. Now if you are in fact building a 383 (4.030 bore, 3.75 stroke) Then shop is right. That sounds like compression figures for a flat topped 383 stroker, not a 355 Theres no combo in this world that will put a 355 with flat top 4 VR pistons and 64cc heads at 10.7:1.
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