Hamilton Cams extreme-duty pushrods are the result of intensive research to produce designs that create the perfect balance between weight and rigidity to maximize rpm. They provide extended longevity and superior operation under extreme conditions, without adding excessive weight to the valve train. Hamilton Cams extreme-duty pushrods feature heat-treated, Chromoly construction with carefully selected pushrod diameters and wall thicknesses to avoid the excessive costs of exotic materials. They are a step up from Hamilton Cams heavy-duty pushrods.