Gold Lifetime Member
Join Date: Jan 2005
Location: 2 Dog Town in West Texas
Re: Head Gasket?
Purpose of hole , according to Felpro , is to aid cooling. There is a hole in most heads that does not match the early blocks. All I did was used the gasket as a template and drilled a 7/16's hole, in the block deck, then chamferred the hole, done deal, easy button. The hole is there, might as well take advantage of it. All you are doing is between two other holes, into the water jacket. If you look down there with a little flashlight, you can see where you are going.
Just start out with a small hole, say 1/4" and work up to 7/16". I used a 1/2" chuck hand drill. Just drill straight.
TC # 349
Zdld17:69 Z/RS,306, NOR141111, 9N554XXX, 12A, X3G, 59/59,723, AFR 195,CCC282/290HR, TKO 600, BU1122B1E Owner since Dec 1968
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