Edelbrock Olds Head Bolt KitThe Edelbrock #8558 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. Warranty This Part Fits: Year Make Model Submodel