Join Date: Mar 2007
Location: Modesto, California
Re: Looking for feedback on new build...
I ran 13:1 on 91 octane pump gas. Did not build it to do that and wouldn't recommend it. I built a 357 many years ago for nitrous with a 268/274 @ 0.050" roller cam with 108ICL and 112LSA with 0.630" lift. I built it for race gas. After I had it running for a while I did a compression check. It cranked 195-205. The engine I ran before this one had 10.9:1 compression and cranked 215-230 because the cam had a 102ICL and 106LSA and a few degrees less @ 0.050". I ran the 10.9:1 engine as my daily on pump gas for 6 years. It had more cylinder pressure than the 13:1 engine so I started running it on pump gas on the street. Still ran race gas at the track because it was on nitrous.
I didn't build the 13:1 engine to run on pump gas. I was more than happy to run race gas. With the cylinder pressure, gearing, converter and car weight it worked fine. That same engine in a tall geared stick car might rattle itself to death. There's more to it than just static compression ratio. The pic is of the pistons used in the 13:1 357. Ross #91461 with 15.2CC domes, zero deck with 64CC heads and 0.041" gaskets.
'69 Camaro - 429 SBC Dart Iron Eagle 9.325" block, Crower crank, Crower 6" Billet rods, Ross pistons (10:1), Total Seal S/S rings, AFR 245 heads, T&D steel rockers, Cloyes Timing Set, 4-7 swap solid roller 274/286 @ .050", .704" lift, Dart single plane, Dominator EFI, Stef's #1705R pan, F2 Procharger on E85