Adjustable, 2-piece, guide plate (single)For 3/8" diameter pushrods and 7/16" Rocker StudsFits Big Block Chevy 396-454ciDesigned for use with RHS® or other aftermarket heads with relocated intake portsEngineered using stereo lithography Techniques for an accurate fitContoured and clearanced for head boltsHardened and black oxide finished2-piece bolt together design