Join Date: Sep 2000
Location: Washington, Michigan USA
I have to defer to the Camaro restoration experts on this one, but small-block Corvettes of the same era had black phosphate intake bolts with aluminum manifolds (same bolt that was painted over on engines with iron manifolds); all Corvette small-block engines came from Flint Engine, as did the engine in my unmolested original '69 Z/28, which also has black phosphate intake bolts.
Corvette big-blocks of the same era(Tonawanda) used silver zinc/cadmium-plated intake bolts with aluminum manifolds.
'69 Z28 Fathom Green