Big 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!!!