I learned the hard way...I had a set of #15s with 1.96 and 1.66 valves....tried making them 2.11 and 1.77 and porting them out....too much trouble, not worth it. Just buy some good 6X's with the big valves and port the sonofabitch out. Go to
www.pontiacwarriors.com and check out some of the dyno runs with the heavily ported 6x heads
Project: Black Hawk
See the saga unfold here:
My 455 Firebird
2001 Camaro Z28 6-speed:
[email protected] stock cam, stock heads, stock rear, stock clutch
__________________
2001 Camaro Z28 M6:
[email protected] stock cam, stock heads, stock rear, stock clutch