Intake Valve. Fits 883cc Sportster 1986-2003. 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 # 18031-86

Head Dia = 1.590″

OAL = 4.550″

Stem Dia = 5/16″ / 0.3108″

MFR PART No: AV-1590
REVELRY PART No: AV-1590