thanks for the info..btw, these are 308 sb heads (ive only got $20 in them at this point, so im not scared!) the swirl port thing sort of worries me..it looks like they take up a lot of room, and the serious heads dont have them. any advice? my hillbilly way of checking these is to cc the ports...best i can do right now. with any luck ill only slow it down .25 sec...lol

It may be ugly, but it sure is slow.

Girls comb their hair in rear view mirrors and the boys try to look so hard....