Correct Bolts 66

[Walter R.]

I am trying to make correct restoration on 427/425. What markings should be on intake and exhaust bolts?

[Joe L.]

Re: Correct Bolts 66

I am trying to make correct restoration on 427/425. What markings should be on intake and exhaust bolts?

Walter-----


Typical markings for the intake bolts would be 3 radial lines with an "A" or an "M" in the center and of untrimmed (i.e. "indented") head configuration. For your application, the bolts were zinc plated and were flanged head style.

The exhaust manifold bolts were trimmed (i.e. "non-indented") standard, non-flanged head. The headmarking was 2 concentric circles and the bolts were black phosphate finished.

[Bill C.]

Re: Correct Bolts 66

Walt,
Contact Ronnie Bonifacio, he owns two 66 425 cars and has thosands of bolts for all areas of these cars and is a wealth of info. Try him at 203-925-8647 EST in Shelton, Conn. I am sure he can help you or anyone else. Good Luck

[Walter R.]

Re: Correct Bolts 66

Thank You!

[Rich P.]

Re: Correct Bolts 66

Walter, most common Intake manifold bolt headmarkings for a 66 425 HP I have seen are FP and M in that order. The exaust manifold bolt headmarkings I have seen are A, N, F. Once I figure out how to post pictures I will post some of each.

[Rich P.]

Re: Correct Bolts 66

OK here is a picture of some original 65-69 BB exaust maniflod bolts. Hope this help in your search. Rich

[Rich P.]

Re: Correct Bolts 66

And now here are the Intake Manifold/Bellhousing bolts. In the back left are M's, back righ are FP's front are A's and CP's (usually bellhousing ).

Rich

[Walter R.]

Re: Correct Bolts 66

Thanks. I have several bolts that have the F/P marking that I am sure are the intake bolts. Now I need to determine exhaust manifold markings.