1960 exhaust manifold bolts - head markings

[Daniel J.]

Wanted to confirm I had the correct bolts for attaching my exhaust manifolds. I have GM #3733134 Group 3.275 / head marking "F" in circle. The judging guide mentions "some may be 'M' head markings", but does not state what is typical. My parts book shows the #3733134 is correct for my car. Another restoration book states "A" & "AP" head markings were used. Thanks, Dan

[Joe M.]

Re: 1960 exhaust manifold bolts - head markings

The majority of the exhaust manifold bolts on my 1960 are "A" in a circle. Several have a circle in a circle with no letter. I never lost a point on my bolts.