JIMS, 84-99 billet tappet block set. Polished

Manufactured from billet 7075-T651 aluminum. Can be used as a stock replacement and with valve lifts up to .655" (at the valve). OEM rocker arm ratio is 1.65:1 in Evo heads. Will clear most small base circle cams with .600" lift or more. JIMS recommends a minimum roller to block clearance of .035". For higher lifts a simple clearance modification is required. This set will replace, and is a upgrade, for OEM 18542-83A and 18540-83A.