Thread: 302 cyl head print (needed!)

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You can go to the site of Schoenfeld headers and download about any header flange spec you might want and/or buy a gasket to copy from several aftermarket heads/bolt patterns

Originally Posted by Louey

Is this what you want ?

from the center of a bolt hole on the right side of the port hole to the center of the bolt hole on the left side of the port hole is 2.0000'' center to center the you subtract the width of the port hole which is 1.3200'' they are round to the nearest 4th decimal place so the precision = .01 or ten thousants so 2.0000'' -1.3200'' = 0.68" divided by 2 because there are 2 spaces one on each side of the port hole from the edge or the port hole to the center of the bolt hole both sides so 0.68"/2=0.34" so from the edge of the port hole to the center of the bolt hole is 0.34" both sides

Originally Posted by Dano61

from the center of a bolt hole on the right side of the port hole to the center of the bolt hole on the left side of the port hole is 2.0000'' center to center the you subtract the width of the port hole which is 1.3200'' they are round to the nearest 4th decimal place so the precision = .01 or ten thousants so 2.0000'' -1.3200'' = 0.68" divided by 2 because there are 2 spaces one on each side of the port hole from the edge or the port hole to the center of the bolt hole both sides so 0.68"/2=0.34" so from the edge of the port hole to the center of the bolt hole is 0.34" both sides

C'mon, the horizontal spacing is obviously centered and thus easily calculated. His question is the vertical spacing of the holes relative to the center of the port. That dimension is obviously not centered, and there is no way to calculate the amount of offset from the information given. You can scale it, but he's asking for factory dimensions, as I understand his question.

It's all really moot - as has been pointed out there are already a ton of bare flanges on the market by people buying materials in bulk, and doing one that reinvents the accuracy is not going to be the multi-million dollar marketing idea never done before, but may be a dandy highschool tech center project.