Intake Valve. Fits Big Twin 1966-1984. OEM Replacement.

* Stock length & head diameter

* Extreme Duty

* High Flow

* one piece forged racing grade stainless steel alloy.

* Liquid nitriding process creates a valve that is smoother and stronger than O.E.M.

* Stems are centerless ground for a longer life

* 45o angle below the lock groove to facilitate the valve seal installation

* Replaces OEM # 18074-66

* Replaces OEM # 18075-80

* Replaces OEM # 18075-81

* Replaces OEM # 18078-80

* Replaces OEM # 18078-81

Head Dia = 1.955"

OAL = 3.875"

Stem Dia = 0.3770"