much good info but like nm9s said there is a big piece missing for us mopar folks useing certain factory heads. 1968+ big block, many 318, all 340 and early 360 heads have a fully round open chamber with a recessed area where we want quench. I measured this recess on a 340 head at .090". so a copied chevy small block article that states "quench is nothing more than the piston in the hole depth plus the head gasket thickness" is lacking for many mopar engines. for engines with fully round open chambers quench is the piston in the hole depth plus head gasket thickness plus head recess
