Superior Strength Small hex head for socket clearance

Edelbrock Head Bolt Kits for Buick 400-455 CID big-block engines are designed for use with the Performer RPM Cylinder Heads. They are 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. The hardened and parallel-ground washers are included. The Standard bolt kits are rated at 170,000 psi while the E-Series Cylinder Head bolt kits have a yield tensile strength of 190,000 psi for strong and reliable loading and come with the distinctive Edelbrock “E” stamped into the head. Both kits have a black oxide finish with sealer and contain (4) 2.25", (4) 4.00" and (12) 4.25" bolts.