360 build

It's got less of a chance with a flat top hyper (especially a Keith Black version) than anything else. And the top of the piston has little to do with cooling anyway. Thin walls are thins walls. you can put any piston you want in there, if they are too thin, it's going to overheat. This would be why a block gets tested prior to boring that large in a performance shop. At this point I'd say overheating is moot. Interestingly enough... read the fine print. I'll wager that the warranty does not cover overheating and it probably has a melt out somewhere on it. Factory Mopar remanufactured engines never went more than .040 over from what I've seen but the '89 360 block I'm working with now could safely take it (I sonic tested it). So dont be too worried. Most .060 over engines will never run hot as a result of the bore size. Some will, but that's why one pays to have it checked when you can.