Edelbrock #8566 Head Bolt Kit compatible with 1968-87 B/B Ford 429/460 with 60665, 60669, 60675, 60679, 61645, 61649, 61669, 60687, 60689, 60697, 60699, 61657, 61659 Performer RPM & Victor Cylinder Heads. Can also be used on 1968-87 Stock Ford Heads. The Edelbrock #8566 bolt kit contain a complete set of the highest quality head bolts and hardened washers available. Cold-formed to ensure molecular integrity and heat treated prior to thread rolling and machining. Reduced diameter bolt heads eliminate the need for valve train removal to facilitate cylinder head re-torqueing. Hardened and parallel-ground washers are included. Rated at 170,000 p.s.i.