The NCRS Spec Pocket Guide only lists the 3931063 cast head for the 390 and 400 hp BB's in Corvette. Likewise in the Summer '85 First Edition, First Printing '68-9 Judging Manual. Yet Alan Colvin's book lists the 3964290 casting as well as the 3931063 for '69 and '70 390 and 400 hp Corvette as well as other hyd. cam Chevys.
I have a pair of 3964290's dated G 28 9, and G 11 9. A previous owner told me they were from his '69 390 horse convertible.
Did Chevy use the 3964290 castings in late '69's or just in the '70 model year?
I have a pair of 3964290's dated G 28 9, and G 11 9. A previous owner told me they were from his '69 390 horse convertible.
Did Chevy use the 3964290 castings in late '69's or just in the '70 model year?
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