Late 67 l68 manifold bolts & washers

[Ralph P.]

What are the usual headmarks on these original bolts? Are there special washers used to protect the aluminum manifold?
Thanks for any help !

[Leif A.]

Re: Late 67 l68 manifold bolts & washers

Ralph,

Page 121 of the 5th edition TIM&JG states "Original cars used 9/16" hex head 3/8" x 1 1/4" recessed hex-head bolts with an M or FP head mark and integral washer OR flat hex-head bolts with an A head mark with three radial lines and integral washer. Intake manifold bolts were typically zinc or cad plated."

[Ralph P.]

Re: Late 67 l68 manifold bolts & washers

Thanks, Leif ! I shudda' looked!