67 B/B Oil Fill Cap Finish

[Brandon K.]

Hey Guys and Gals, Happy New Year!

Hoping someone can tell me the correct finish for the oil fill cap on a 400 horse 67 Big Block. The JG I've got says black chromate, but I've heard they should be painted black. Opinions? I understand that black chromate is sometimes greenish. Is it like a black oxide?

thanks in advance!

Brandon

[Joe L.]

Re: 67 B/B Oil Fill Cap Finish

Brandon------

The GM spec for the part calls for black paint. The ones that I have inspected were definitely painted semi-flat black. It's possible that some were otherwise finished, but I really think that, if so, it was the exception and not the rule.

[Brandon K.]

Thanks Uncle Joe! *NM*

[Rob A.]

Re: 67 B/B Oil Fill Cap Finish

I have a 400HP '67 myself. The cap on my engine, which may or not be original, is a greenish finish that almost looks like a plating of some kind, it's kind of hard to describe. I've seen some which are supposively original to their engine that resemble mine, for whatever that's worth.

[Brandon K.]

Re: 67 B/B Oil Fill Cap Characteristics

I looked some more at the cap that I have. It has the S stamped in the rivet on top, but not the "sm" in a circle as specified by the JG. Also, I was told several yrs ago by an NCRS judge that the square brass rivet on the inside is supposed to have a dimple in it, like it was "drilled out", but mine does not have that. Do I have a later cap, or is mine OK?

Thanks, Brandon

[Rob A.]

Re: 67 B/B Oil Fill Cap Characteristics

Mine has the small circled sm logo, which as you say, is the correct marking on original caps according to the judging manual.