Mild 360 Magnum Build

67autocross said

Lots of interesting piston information you are sharing, the ones I ordered look to be stock knock offs in 30 over... just want to be able to fill the tank with 87 and I will try to make 375hp in the very low 5000rpm range

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Seems doable.. the 87 requirement is going to need some attention and I'd surely work for quench as suggested to help get there. At least you are starting out with the right chamber type. Any closed chamber helps to get the burn completed more quickly, and the faster the overall burn time, the less chance of getting to a detonation point.

BTW, I see your online name has 'autocross' in it. I try to not go on too boringly long, but if that is one of the uses, better CR will help your torque range be wider, and that is ALWAYS a VERY important thing to have for any autocross, road race or rally type of use..... You will need an engine to put out good torque at a wide variety of RPM ranges as you will encounter all sorts of curve radii and exit speeds. If that is one of the uses, a wide torque band is far more important than peak HP numbers, and should govern CR and cam selection to maximize DCR.