Ford SB 289 302 351 Windsor Head Bolt Bushing Kits 1/2 O.D. x 7/16 I.D equal-distribution layout produces great midrange

equal-distribution layout produces great midrange torque without compromising top-end power

using an O-ring to prevent leakage

They are designed to ensure belt retention at high rpm

thus reducing the transmission temperatures for optimum performance

Speedmaster lightweight crankshafts are perfect for engines wanting quicker rpm

Ford SB 289 302 351 Windsor Head Bolt Bushing Kits 1/2 O.D. x 7/16 I.D equal-distribution layout produces great midrangeThese Speedmaster head bolt bushing kits allow you to use stock or aftermarket head bolts with Speedmaster or other aftermarket cylinder heads. They take the place of your head bolt washers and are hardened and chamfered.