Inliners International Forums General Discussion Engines should I jump on these forged 307 pistons??

Frenchtown: I think you have it backward. The chamfer is meant to expose the crevice volume to combustion and reduce HC residuals.

A true flat top without the chamfer quenches the gasses in the crevice above the top ring (high surface to volume ratio) and prevents them from burning.

My understanding anyway.