Gx390/420/440 Billet 45/36 head Type of rockers being used:Black venoms com/products/550-cast-alloy-ride-plate-for-750-pump-conversions

com/products/550-cast-alloy-ride-plate-for-750-pump-conversions

with a 72mm tillotson block

-45/36 titanium valves

100" - 40cfm

Spring Installed height 1

Gx390/420/440 Billet 45/36 head Type of rockers being used:Black venoms com/products/550-cast-alloy-ride-plate-for-750-pump-conversionsBig Block Gx390 420 440 billet head 45 36 titanium valves, 37cc chamber Ampco 45 seats, Comp cams gp966 springs, Titanium Retainers uses gx390 style rockers, Now with offset valve cover spacer to accept springs up to 1. 5" Diameter Flows 220cfm Comes with custom exhaust flange, widened rocker shaft, valve cover spacer, and Intake! must use aftermarket valve cover!!!