[QUOTE=2BAD4U;3432712]SO... Your running 13psi on 8.2-1 on pump gas right? I have a 509 SRP Forged Blower pistons 8.5-1 and Scatt rod's. I wanted to take my M-3 from 5psi to around 10. Some dude at AZSM said it will pop and i'm crazy. I understand cars and boats are kinda like apples and oranges. I understand that boats are under more load and you are at higher rpms for longer periods of time. But I can take a 9.0-1 motor in a car and throw 14 lbs at it and have a 17 degrees of timing in it and not have to worry about detnation. So i couldn't see why I would have problems. I just put cometic head gaskets in and pro comp aluminum heads and studed them in. I can't imagine that i would see detnation with 91 oct. on 8.5-1 motor on 10psi at 6,000 elevation with only 8 degrees of total timing. But my buddy who has a Baja like mine but a 454 m3sc who is only running 3psi says i'm crazy.[/QUOTE
Unless you run 28-30 degrees of advance your exhaust valves will turn into glow plugs. Either they will tulip and fall off or they will cause the mixture to pre-ignite or both. That's one of the differences between cars and boats that people here have learned the hard way. Given your elevation, I'm sure you could run 8-10lbs with an intercooler on 91 with 8.5 comp. Above that, you better be careful.