These are exact reproductions of the factory original big-block pulleys. The 1965-68 units are 2-groove crank pulleys for special high-performance applications, while the 1969-72 3-groove pulleys are for cars with air conditioning.
Authentic reproduction of the original GM product HP = High performance .
Find in OPGI's 2019 Chevelle Catalog page 393.
This product can expose you to chemicals including lead, sulfur, nickel, chromium, vanadium, titanium, polyvinyl chloride, and 4,4’-methylenebis (2-chloroaniline), which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.