Total revolutionary way to modify your Shovelhead. Stop spending hours welding and machining the old boxes and then manufacturing all the parts. The Shovelhead is one of the coolest looking motors ever produced and splitting the rocker boxes makes it look that much cooler. Fits all 66-84 Shovelhead motors and all aftermarket motors using the same type of rocker box. Available in raw metal, polished or chrome finish. Exterior copper oil line kit with machined rocker shaft nuts are sold separately, in case another top end oiling feed is planned. Note: Can be used with the S&S hydraulic lifter update kit (S&S# 33-5451), S&S Shovelhead rocker arms (S&S# 90-4320) and a Evolution cam, to oil the top end through the pushrods.