[PMD1969]

Originally Posted by Jeff Hamlin

Some SR parts were painted opposed to some OEM un-painted parts but can't say for sure this would be the case.
Besides when hoarders hang onto parts for 45+ years they will likely end up getting rusty.

I have an NORS and it has some sort of clear coat on it which has some scratches on it.
Even new they don't stay shiny forever.

Blast it and hit with high temp cast iron paint it will look good.

Originally Posted by jmt455

It could be NOS; I had many Pontiac Service exhaust pipes from the 50s and 60s that were painted black.

Are there any installation witness marks on the flanges?

If it's OEM, it will have the GM part number stamped on it somewhere.

I have blasted it and it looks great. Not yet coated or painted.

It was never installed as there are no marks or stress on it at all. I will look for the part numbers later this evening. Now I wish I would have bought both of them.