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don't the larger vales come close to the smaller bore?

They do on the M.W. heads, maybe so on the Eddy RPM also depending on cam lift Not to hijack this thread but I just finished checking a 1976 OEM Dodge truck or motor home 440 motor, non 440-3 motor, and it has the pistons down in the cylinders -.263 on one side and -.276 on the other side, that computes to 6.63 to 1 compression ratio with the flat top pistons and 84 CC heads(someone had changed the heads and cam to a set of Eddy RPM and a Comp Cams 268 H cam) and a .039 thick head gasket with the stock bore and stroke

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)