by frost » Tue Sep 18, 2007 6:12 pm
also you can slot the black top exhaust mani so there is a step at the top of the port to help stop exhaust gas going back wards into the port once its out, i think the blacktop mani is about 1.5 mil larger in diameter, i know they are over kill for a standred motor but if your doing head work in the future there a pretty good investment,