Balancer bolt

[68Zproject]

I've been going through all the threads without much luck.  What is the usual headmark on the balancer bolt?  And did it have a lock washer or a star washer?  In the AIM it looks to be a star washer.

[rszmjt]

My 69 Z28 has "TR" headmark with a star washer, it is also drilled as though safety wire could be used. Owned the car since 74.

FWIW.  I have seen this drilled balancer bolt before on lots of high HP Corvette and Z28 engines. Also seen "WB" head marking.

Hope this Helps.

[68Zproject]

Well, I have one that says TR and one that says Rockford.  I know I got a repro one once and it stripped out so I wanted to make sure I didn't use that one again.