Wouldn't the OS valve still seat in the same position (depth)as the stock valve when the seat is opened up? If so wouldn't the stock valve length still be correct for the new valve geometry?
50 GMC 1/2 302, "Jimbo"
58 Chevy Cameo 1/2 ton, 283 "Old Blue"
31 Model A Cabrio "Annabelle"
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