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Trend Performance 9.300" Long Pushrod - 3/8" Diameter - 0.135" Wall - Ball Ends - Chromoly SPBM3 1976-1980 Chevrolet K10Fits 1990 andProduct Description: Pushrod 9. 300 in Long 3 8 in Diameter 0. 135 in Thick Wall Ball Ends Chromoly Sold Individually In 1993 SpinTron emerged, launching a tool to do meaningful research into valve train testing and technology. This testing exposed profound inadequacies in pushrod design. These inadequacies amazed SpinTron creator Bob Fox and his collaborator, the late Randy Dorton. Pushrod design changed irrevocably with Fox establishing his pushrod