Help identify mystery headers

[novassdude]

Originally Posted by Alan Roehrich

That's the "Stahl" pattern, Jere created it decades ago to allow easy installation of large tube headers on a small block head. Originally, there were adapter plates, with counter sun holes, and later, some cylinder head companies machined that pattern into the heads.

I bought them assuming from just pictures that they were a stall small block chevy. But after setting them next to a pair of small block header it became clear they were not for a small block Chevy. I do have an old set of stahl headers but a much smaller tube than i need now.