Gx390/420/440 Billet 45/36 head Type of rockers being used:Black venoms -45/36 titanium valves

-45/36 titanium valves

Valve Length: 3

Billet valve cover for Gx200 and clone engines

-Hardened seat to be used with Stainless valves

You will be emailed to verify the specific of your build

Gx390/420/440 Billet 45/36 head Type of rockers being used:Black venoms -45/36 titanium valvesBig 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!!!