Engine Roller Rocker Arm Set 1.6 Ratio 3/8 Stud Self Aligning Fits SB Chevy Clamshell Pack Proform proform The adapter screws into 14mm

The adapter screws into 14mm spark plug holes

Engine Rocker Arm Kit

01 inch increments

And 3/4-16 Adapters

Engine Roller Rocker Arm Set 1.6 Ratio 3/8 Stud Self Aligning Fits SB Chevy Clamshell Pack Proform proform The adapter screws into 14mmFits Chevy small block engines with center hold down valve covers. Rid your engine of internal friction with roller tipped rocker arms. The race proven full needle bearing, fulcrum and roller tip not only unleash horsepower, they also lengthen valve train component life and reduce wear and tear on valve stem tips. Precision machined to insure consistency and ratio accuracy. 16 extruded aluminum roller rockers and 16 poly locks. Sold as one set.