BBC - Promaxx - 317cc Ported
ProMaxx 317cc ported
-24 degree
-2.25/1.88 valves
-119cc chambers
-Rectangle port intake runners
-Uses stud mount rockers
Flow numbers from 4.310 bore no exhaust pipe
Intake Exhaust
.1 75 65
.2 162 133
.3 232 181
.4 281 227
.5 319 264
.6 355 279
.7 379 284
.8 394 289
.9 397 291
1.0 406 292
$3700 Assembled for the pair setup for solid roller cam up to .850lift