I just remember a lot of people saying to use 130 lb springs with the xp cam. I asked around and found plenty of people used 90 lb springs, so since I had them already, I used the 90's. I went with a set of L32 heads ported by Chris Hinson.

Wouldn't the power band be similar on all xp cam builds regardless of the heads/spring combo? or do those 2 variables have greater influence than I think?