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They use silicon aluminum bi-metal construction
These pulleys are available in your choice of two finishes
These Speedmaster aluminum water pump pulleys are made from a 356 aluminum alloy that is heat-treated to T-6 aluminum specifications and come in machined or polished finishes to suit your application
Featuring thicker walls and more gusseting than any other manufacturer
while delivering increased engine vacuum
Chevy SBC 350 Billet Aluminum Long Water Pump Lwp 2 Groove Water Pump Pulley They use silicon aluminum bi-metalTthese Speedmaster aluminum water pump pulleys. These water pump pulleys are made from a 356 aluminum alloy that is heat treated to T 6 specs, and come in machined or polished finishes to suit your application needs.
