3/8" Polylock Rocker Arm Nut Set (Suits: Aluminum Rockers) These water pump pulleys are

These water pump pulleys are made from a 356 aluminum alloy that is heat-treated to T-6 specs

This one-piece billet steel flexplate offers the strongest gear teeth

ULP and Premium FuelsAttention: Not for use on stock intake manifolds

plus a reserve

wall thickness and are formed from 4130 chromoly steel

3/8" Polylock Rocker Arm Nut Set (Suits: Aluminum Rockers) These water pump pulleys areSpeedmaster rocker arm adjusting nuts are high quality polylocks designed for full roller rocker arms. Made from heat treated, premium grade 4140 chromoly steel, these adjusters provide 190,000 psi tensile strength for the utmost in reliability. Precision CNC machined threads to ensure optimum seat pressure, flush machined set screws for proper contact on the studs, and, best of all, they don't require any special tools for installation. They're