{"product_id":"edelbrock-head-bolt-kit-for-60809-60819-409-perf-rpm-cylinder-heads","title":"Edelbrock Head Bolt Kit for 60809\/60819 409 Perf RPM Cylinder Heads","description":"\u003cp\u003eThe Edelbrock #8581 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.\n\u003cbr\u003eEdelbrock #8581 is a Head Bolt Kit for 1958-65 Big-Block Chevrolet 348\/409 \"W\" Engines with Edelbrock 60809. 60815, \u0026amp; 60819 Performer RPM Cylinder Heads. 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