v4.00ID/BBC
3.59in² MIN (throat)
122cc chamber
363cc runner
2.350 intake
1.880 exhaust
50º seats
4.600 fixture 
.200 154/155/145
.300 229/232/194
.400 290/293/231
.500 346/344/267
.600 392/390/292
.700 420/417/303
.800 434/431/311
.900 440/437/314
1.00 446/441/316

We spent a great amount of effort equalizing the ports for more consistent CSA and flow!  This is a powerful program that is in a Dart iron casting! Call for recent dyno results!  Popular cylinder head for Truck Pullers. 

470" = 940hp
500" = 1020hp
515" = 1060hp
615" = 1060hp (SSRE built)
632" = 1120hp​ 

$3250. Bare fully CNC'd w/Valve Job

$5250.  Fully CNC'd, Manley Severe Duty Stainless Valves, PAC Triple springs. Manley Titanium Retainers, Manley Bead Locks, Manley locators, viton seals, bagged and ready for install.

$6650.  Fully CNC'd, Hand Finished, Manley Titanium Valves, PAC Triple springs. Manley Titanium Retainers, Manley Bead Locks, Manley locators, viton seals, bagged and ready for install.