Alum duel quad Manifold

[csheff]

Hi,
What finish is correct for the manifold (500) bolts. I seen two types blackish finish amk from NPD and silver finish directly from amk both stating for 67 GT-500. Any help guys?

[98SVT - was 06GT]

No finish. Natural as cast. Dry Ice blasting is the best method it doesn't effect the original surface.

https://youtu.be/QGgcaMO_PZw?t=54

https://www.youtube.com/watch?v=J3YikY0K25c

[Bob Gaines]

Hi,
What finish is correct for the manifold (500) I seen two types blackish finish amk from NPD and silver finish directly from amk both stating for 67 GT-500. Any help guys?

If you are speaking of the intake bolts then they were zinc silver originally. The factory cast iron intake bolts are dark gray which was is phosphate and oil.

[csheff]

Thanks Bob & 98svt