I was given a set of G heads this weekend which has given me some questions. I checked the measuring blocks on the side of the heads and had the following result. Measuring from the end block with no bolt hole to the one with. Head 1, 1.002", 1.005", 1.006", 1.001". Head 2, .995", .997", .995", .990". Obviously one head has been surfaced and the other not, but I found it curious that measurements on one head would vary so much. Now for the question. If the one that has already been milled is flat should I just mill the other to match or, should I have both milled to a specific spec, say .015 removed, and if so how much? Engine is s 312 with a Clay Smith 265 cam used as go to shows and puttering around car.



Thanks, Mike

1956 Fairlane Victoria (ORREO)

 

Overlooking Beautiful Rimrock AZ

The set of 113 heads I recently acquired were the same way, one had been milled approx. .005 and the other not at all.  I plan to have the intake seats installed and put in stainless intakes, then will cc the chambers and mill according to discrepancies found in chamber size.  Cant ever seem to remember the exact formula, but 1 cc less chamber size for each .005 removed is close. 

Mike

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.