Valvetrain geometry is extremely critical on high performance engines. Getting it right has never been easier. The Master Kit includes 8 aluminum adjustable pushrods with 5/16'' ball tips of each length listed below in addition to 2 valve checking springs, 2 x 5/16'' cup tips and 2 x 3/8'' cup tips. Fits virtually every engine combination from a SB-Ford to an 800+'' 'Mountain Motor' and everything in between. A must have for every engine builder. Individual pushrods and replacement tips are available separately. Made In USA Note: intended for checking length only, not for use in a running engine!