If you are using a spring any larger than 1.560 with a 7/16 rocker stud, Harland Sharp recommends our "Heavy Duty" 7/16 series roller rockers. Part # CSP-SH1006
Specs:
Rocker Arm Mounting Style: Stud
Self-Aligning: No
Rocker Arm Ratio: 1.65
Stud Size: 7/16 in.
Maximum Spring Diameter (in.): 1.560 in.
Rocker Arm Style: Full roller
Shims Included: No
Rocker Arm Material: Aluminum
Rocker Arm Body Style: Standard
Rocker Arm Fasteners Included: Yes
Rocker Arm Nut Style: Polylock
Slot Width (in.): 0.625 in.
Rocker Arm Finish: Orange anodized
Quantity: Set of 16
Special Features:
Eliminates as much as 100 grams of moving mass from your valetrain.
Fits Center bolt Valve Covers with slight modifications to the covers.
Designed to clear up to a 1.560 diameter valve spring.
Fitment:
1955 to 1999 262-400 Small Block Chevrolet