COMP Cams Ultra Pro Magnum Chromoly Roller Rocker Arm - 3/8 in Stud Mount - 1.60 Ratio - Small Block Ford (Set of 16) 1631-16 51115222 5/16" Insta-dapt adapter

5/16" Insta-dapt adapter

Attach to the fluid reservoir with the cap adapter

3 mm Thick

Clamp-on rings fasten around most 3" axle tubes to use as a starting point for building custom trailing arms

Cylinder head flow 291 cfm on the intake and 217 cfm on the exhaust at

COMP Cams Ultra Pro Magnum Chromoly Roller Rocker Arm - 3/8 in Stud Mount - 1.60 Ratio - Small Block Ford (Set of 16) 1631-16 51115222 5/16" Insta-dapt adapterComp Cams Ultra Pro Magnum Chromoly Roller Rocker Arm 3 8 in Stud Mount 1. 60 Ratio Small Block Ford (Set of 16) The Ultra Pro Magnum Roller Rocker Arms for Ford V8 289 302 351W applications not only live up to the lofty standards of the original Pro Magnums, but they also take stud mount rocker performance, stability and value to a whole new level. These rocker arms feature a 3 8" stud diameter and 1. 6 ratio. The 8650 chromemoly material and arched,