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Jesel Sportsman Shaft Mount Full Roller Rocker Arm - 1.70 Ratio - BRODIX Heads - Big Block Chevy - Set of 16 KSS-097070 H767001XXL AMP Research PowerStep XL RunningProduct Description: Rocker Arm Sportsman Shaft Mount 1. 70 Ratio Full Roller Aluminum Natural Brodix Heads Big Block Chevy Set of 16 Dan Jesel realized early on that the success and demand for his high end valvetrain components was in part dependent on huge valve lifts, unheard of spring pressures and rpm that most thought was impossible. So he started on a 10 year quest to perfect the roller lifter. After nearly nine years of R&D and endless