For use with 48 Degree lifter blocks. Features flat-machined rocker pads that require the use of T&D race rocker arms and long valves. Heads must be oiled through the tappets and hollow pushrods. Older style rocker stands and rocker systems do not work with these heads. 62cc chamber 2.02" Intake, 1.60" Exhaust 47cc Chamber Tall Stands - Dual pattern exhaust -open chamber Cast # P4532693