Part# YT6321 - Yella Terra Platinum extreme duty racing roller rockers, twin shaft type roller set to suit Ford 429, 429-BOSS and 460 V8 engines commonly referred to as the 385 family of Ford big block engines or the Poly Angle big blocks. The extreme race series of rollers is the latest design, extruded 2024 aluminium [aluminum for our USA friends] rocker arms, wide body roller rockers for extreme race applications. For use with mechanical or hydraulic camshafts. Includes shafts and 7/16 UNC mounting fixtures, adjustable valve lash on tail of rocker arm [push rod side] with a rocker arm ratio of 1.73 : 1

NOTE: Standard heads may require machining for the screw in fixings ~ drill & tap for 7/16” UNC