Alan is correct,
after looking at a number of flat tappet cams, the one I knew for sure that is a Pro 55 core, did in fact have a 55 cast into the cam. None of the other cams I examined had the 55 number.
Jeff & Larry Woodfin
Team Woodfin Racing
F/SA
"Standing Novation" 1969 Nova
"I am glad old, is not as old as it used to be" Larry Woodfin
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