I have a ramhorn exhaust casting number 3855163A, right hand casting, with a date code of H8. This manifold states right hand, but it has an accessory mounting boss with forward facing holes. It has an outlet that is 45 degrees back, and slightly out. It is a moderately free flowing casting with a 2 inch outlet. It has a beveled seat for a doughnut style flange.

I've never seen a casting number with a letter after it, and does anybody know anything about the forward facing mounting holes on the accessory boss?

Any information would be greatly appreciated.
Thank you very much.

 

Can you post a pic? Not sure but I think ramhorn manifolds were exclusive to Corvettes.

 

Are the forward holes part of where an alternator mount goes?

 

I had a 1967 Camero and I still have the LH exhaust manifold with the 3855163A casting number on it. It had a 327 engine. Hope this helps.