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There really is a difference in pushrods, depending on the kind of platform you want to have for power. According to Marvin, you can opt for the low-buck, three-piece push rod, or step up and sleep better with the more expensive one-piece in the interest of valvetrain integrity. Comp Cams can assist with the choice. The more aggressive the lift, the more you need a one-piece pushrod with a .080-inch wall thickness.