Brand: ARP
Manufacturer's Part Number: 135-7221
Part Type: Rocker Arm Studs
Product Line: ARP High Performance Series Rocker Arm Studs
Automotive Fittings Part Number: ARP-135-7221
UPC: 672036031589
Base Thread Size: M10 x 1.5
Rocker Arm Nut Thread Size: 7/16 in.-20
Rocker Arm Stud Material: 8740 Chromoly
Guideplate Locator Shank: No
Rocker Arm Nut Thread Length (in.): 0.600 in.
Effective Stud Length (in.): 1.750 in.
Base Thread Length (in.): 0.750
Quantity: Sold as a pair.
Notes: Designed to fit 8.1L gas engines.
Description:
ARP High Performance Series rocker arm studs are ideal for ET bracket racing, limited rule oval track competition, or street use. Made from 8740 chromoly steel and are heat-treated to 180,000 psi tensile strength, they are concentric within .005 T.I.R. thread pitch to thread pitch, which will give you more consistent rocker geometry. With an extra-large radius base, they are more resistant to flex and will provide a more positive seating. These rocker arm studs are designed to be used with Perma-Loc adjusters (not for use with OEM-style, self-locking nuts).