'302' Combustion chamber volume?

Not trying to be a smart *** or anything like that so please don't take it that way.

I have been running 10:7 compression with iron heads with no pinging but I do run 93 octane ALL of the time. I believe what really helps my situation is my cam a more overlap than others (from what i've told anyways).

I thought the 302 had the smallest ports of iron heads.

My friend runs 11 compression but runs 110 octane race fuel with iron heads.
The small ports of the 302 is what makes it work so good on a 318. And cam overlap increases time to full cylinder pressure. It can also increase it to thats how you get big power with out over high compression. The reason computer controlled engines have knock sensors is the ear can't hear real light pinging. It takes all I earn to have my hot rods I can't afford to run high buck gas.