Alt. Adjusting Bolt Marking 72 Sm Blk.

[Edward J.]

My 72 Has A Head Marking Of Tr With Three Slashes, Judging Manuel Say Most Have Wb , Are There Other Markings On This Bolt, Mine Appears To Be Orignal With The Thick Washer And Dark Locking Washer. Thanks For Your Responses Ed

[Jeff D.]

Re: Alt. Adjusting Bolt Marking 72 Sm Blk.

My 72 small block has a wb bolt. It was Bloomington survivor certified this summer.

[Jack H.]

Re: Alt. Adjusting Bolt Marking 72 Sm Blk.

Exact text of the JG reads:

"...The bolt is almost always zinc or cadmium plated with a WB head mark and three radial lines (grade 5)..."

Note the text does NOT say all Corvettes used this fastener ('almost always' is a pretty clear disclaimer). GM had more than one supplier of a given fastener!

[Terry M.]

Re: Alt. Adjusting Bolt Marking 72 Sm Blk.

If it looks original to your car -- go with it. As Jack notes the judging manual allows for other than WB headmark, and for good reason. That bolt, as installed at the factory, will ALWAYS have the three lines -- grade 5. Count on that.

[Edward J.]

Re: Alt. Adjusting Bolt Marking 72 Sm Blk.

Thanks For The Reponse Terry, Im Sure That It Must Be Orignal To Car, The Manuel Had Me Wondering.

[Rich P.]

Re: Alt. Adjusting Bolt Marking 72 Sm Blk.

Thanks For The Reponse Terry, Im Sure That It Must Be Orignal To Car, The Manuel Had Me Wondering.

Ed,

WB is a very common head. I have seen L5, TR, RBW, RSC, NAT and many others (all grade 5)

Rich

[Bryan M.]

Re: Alt. Adjusting Bolt Marking 72 Sm Blk.

Ed,

WB is a very common head. I have seen L5, TR, RBW, RSC, NAT and many others (all grade 5)

Rich

What about these head markings from my 72?

[Rich P.]

Re: Alt. Adjusting Bolt Marking 72 Sm Blk.

Bryan,

I have not seen that as an original headmarking on 72 or earlier cars I don't know about mid 70's but I think that is a hardware store brand. I can't say for sure as you are right at the break off of cars that I have worked on at 72.

Rich

[Bryan M.]

Re: Alt. Adjusting Bolt Marking 72 Sm Blk.

Bryan,

I have not seen that as an original headmarking on 72 or earlier cars I don't know about mid 70's but I think that is a hardware store brand. I can't say for sure as you are right at the break off of cars that I have worked on at 72.

Rich

Rich,
Thanks for the reply! If that's the case, I'll keep an eye out for a bolt with the more common head marking.