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I know there are a few accepted headmarks for a 1967 big block.However, i see some with small letters as well as large letters.I've also seen some others with lines on the head of the bolt with the letters.Which is original and correct.Also, is there an easy way to tell a repro headmark from an original. Thanks, for any help.
There may be other original examples, but in general the TR mark is the larger style with no grade markings and the SBCs for the wire grounds are unpainted and have small letters with three grade marks.
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