Quote:

heres dwaynes numbers vs what chapman advertises for the 260cc head

chapman
Flow Figures @ 28"
Intake Exhaust
.100 71 55
.200 157 112
.300 230 177
.400 290 211
.500 325 233
.600 351 242
.700 351 252

PRH
lift---in/ex
.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 they might get my car deep into the 12's



Ya, with the emergency brake on maybe.