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which translates they are much thicker
2010 Harley-Davidson Sportster Iron - XL 883N
Used on the stock intake of 84-89 Evolution Big Twin models that are not converted to the later model manifold
and touring
JIMS, 84-99 billet tappet block set. Polished - 84-99 Evo B.T.(NU) 949086 which translates they are muchManufactured 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.
