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This discussion came up months ago.. There was a change in head gaskets, maybe in the late 70s or so. The round holes were eliminated in favor of slots. I locate the exact place where the holes need to be and repunch the head gasket. I have a set of FelPros done that way on a max wedge and I can't even get it to heat up now. Maybe a little to much flow now??



There was NEVER a round hole , the original head gaskets from my 69 383 have a rectangular shaped hole instead of the slit, no other holes added . I can't see it making a huge difference .



Huge difference ?, My car is a 1971 Charger R/T that has the stock 22" radiator, I've got a "Glen-Ray" radiator and my car runs at 190 cruising and creeps to 200 at stop signs, IYHO would the change in gasket ie (punching a bigger hole" bring it down 5-10 degrees?...thanks

Semper Fi