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Valvetrain tip: Joe Sherman is a stickler on the little things such as correct valvetrain geometry. The rocker arm tip should sit flush on the valve stem slightly to the inside of the center of the stem. Any place else will cost power and longevity. The fix? Longer or shorter pushrods. Cast-iron heads seem more exact for factory stock length pushrods. Aluminum heads often have higher spring pockets and even different valve locations. So, exact valvetrain geometry must be checked out.