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Just two far as I know, it was the first bb head with the 1.74 exh valve I think also....



It was the second. The '63 383-343hp 2x4bbl motor used a 1.74 exh valve. I think the '62-'64 300 letter cars also used a 1.74 exh.

There were more 1.60 exh 915s than there were 1.74. I've had two pair over the years.