Here's the Chapman 260 standard Ports ( from the Tech archives)
These are the Chapman CNC'd MP Stage VI 260cc's:
Lift" I/E
.100--71.5/58.2
.200-150.0/118.6
.300-219.4/180.0
.400-278.7/219.4
.500-323.6/233.9
.550-338.9/240.3
.600-352.3/243.5
.650-348.5/246.7
.700-348.5/249.9
.750-348.5/251.5
.800-348.5/253.1
I think up to .450 the TW's are impressively close. 290cfm at only .450 is gonna be killer, you basically only need a very mild .525-.550 lift cam to easily cover 600hp, easy on the RPM/bottom end, easy on springs too
Last edited by Streetwize; 10/08/15 02:13 PM.
