Edelbrock part #9616 Valve Stem Locks are 7 Degree, Hardened Steel with a 11/32" stem, standard height, machined and hardened replacement valve locks. These valve locks are used in the 460 Ford Performer RPM cylinder heads P/N 6066 & 6067, and in the SB Chevy and SB Ford Victor Jr. cylinder heads P/N 7761, 7762, 7718, & 7719. Only machined and hardened valve locks are acceptable in these applications. Stamped valve locks are not acceptable in these applications