Brodix B1BA heads...

I had some on a 408 in a 74 Swinger. They were milled pretty heavily, but, the ports were out of the box stock. Compression on that 408 was 15-1. Car was all steel and windows all glass. Fiberglass bumpers front and rear. 28x10.5 slicks and 4.56 gear. On a "normal for where I run" day(track DA usually at about 3500-4000 ft.), it would click off consistent 11.30's. Ususally an 11.37. I should add, these were just the BA's. NOT the MC's.