* 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 # 18082-57
* Replaces OEM # 18087-81
Head Dia = 1.750in.
OAL = 3.830in.
Stem Dia = 0.3764in.