Quote Originally Posted by steelsixpack101
when we people around here talk cams, we mean advertised duration, and by the way you can make more power using open chamber heads (less valve shrouding) just have the heads milled to the desired compression ratio.
No one that builds engines talks about cam's in terms of advertised duration.
The reason is every cam company is different.
I do "roll" the heads meaning that I angle mill them.
Yes,in the small block Chevy after-market heads you can pick up hp doing this.
One because it will raise your compression and two because it will change the angle of the valve as it relates to the cylinder head.