I did a search for this and came up with zip. When it comes to building a high performance street motor, my thinking is to run as much compression as pump gas will allow for. It seems today's motors are capable of sustaining much higher compression on much lower octane fuel. For instance, my buddy's LT1 equipped Camaro has 11:1 compression and can run all day on 89 octane. Whereas my 383 Chrysler with factory flat-tops has 10.2:1, and will sometimes ping on 93 on a hot day. So, what are the factors in preventing detonation and sustaining high compression on the street? Obviously ignition has a lot to do with it. But what about aluminum heads? Combustion chamber design? Cam profile? I remember Scotch's thread years ago about a nasty SBC he built with ceramic coated pistons(?) cranking out 500+ hp on 87 octane. THAT'S the kind of stuff I'm talking about. Combine some new-fangled technology and some old engines...is it possible to have a carbed, 11:1 331 Caddy or 303 Olds running like a scalded dog on pump gas?