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picked up a pair of '68 3917291 2.02 heads this past week for an L79 project. one(K 1 7) has pressed in studs, 1.125 spring seats, the other(K 21 7)has screw in studs, 1.250 seats. i'm assuming these are off different engines. can't find any info as far as pressed/screw in studs or spring seat diameters.
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