X-heads / 6 Barrel combo porting

Heads are back

Lift----------Intake-----------Exhaust

.100 _______80________ 63.81
.200 ______134.4_______115.15
.300 ______187.7 ______161.42
.400 _______224 _______179.3
.500 ______236.8 _______190.7
.600 ______256.7 _______193.7