Part# YT6612 - Yella Terra Platinum extreme duty racing roller rockers, twin shaft type roller set to suit Ford late 5.0 & 5.8 litre Windsor V8 EFI engines or carburettor 289, 302, 351 engines with after market heads [see below]. 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 1.7 : 1

These Ford windsor Roller Rocker Arms suit aftermarket iron and Alloy heads of the following brands. AFR Alloy, Edelbrock Performer series 6027 - 6031, Edelbrock Performer RPM series 6021 - 6026 and Edelbrock Victor Jr series 7716 - 7719.