Measure the proper pushrod length with these simple length checkers. Simply unscrew the adjustable end until it's the right length, then take it out and measure. Don't chance destroying your valve train because of improper pushrod geometry! Part no. 67560...6.125 - 7.500, Part no. 67561...7.500 - 8.700, Part no. 67562...8.500 - 9.800, Part no. 67563...9.700 - 11.00, Part no. 67564...10.200 - 11.500