Gx390/420/440 Billet 45/36 head

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!!!