I've seen many BB and SB iron heads, before the new aluminum heads came without that passage , blocked off on the inside of the exhaust ports with a piece of thein steel brazed over it up
I've also tried stuffing them full of stainless steel wool pot cleaners with out success, they would blow out through the exhaust quickly whiney

Last edited by Cab_Burge; 01/06/21 01:26 PM.

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