For the '91Z28 w/350,are the valve covers gray or black?Mine are gray and I had seen on the '92 350 Zs are black.What's the deal?

It's believed that the 92's received covers from the Corvette, as the Vette received the new LT1 engine that very year. Also, i believe the tuned port runners had a different appearance or texture to them.

91 TPI engines in F bodys have silver/gray valve covers.

All tuned port engines used silver valve covers while everything else used black. When GM ran out of silver valve covers in 92, they used black valve covers identical to every TBI engine and the LT1's, etc... The same example is why the throttle body plates on some 92's are blank rather than the 85-91 "tuned port injection" plates. Also some 92's received corvette runners that have the same texture as the plenum on the tubes, rahter than smooth like the fbodies.

I could of sworn I added this all to the tech data last year.

All that I was asking was an insight on the V covers color. geez

My 1992 Z (L98)has gray valve covers.It was in an early production run and it was #375 off the assembly line.I have seen black on later vins also.

Mine are black. My buddy has a 91Z and his are black. Ill check around and see what everone else has................

Grey here....

Thanks guys..