I had a 426 Hemi mag blower manifold Dow 7 coated by Littlefield blowers years back and it was black, I wasn't asked about what color I wanted so maybe they only had black available in the early 1990s confused
Mag anything not coated will corrode and turn black whiney shruggy

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)