Oversize Intake Valve Guide. Fits Twin Cam 2005-17 & Sportster 2005-2021. +.001in. Outside Diameter DNA-21280250 * Includes Front & Rear

* Includes Front & Rear Gaskets with BCM

* Replaces OEM # 31604-06

* Includes 1 x SS11-2386 Bowl Gasket

* Will not fit models with OEM forward controls e

Comprised of multiple embossed layers of stainless steel with the outer layers utilizing a viton rubber coating

Oversize Intake Valve Guide. Fits Twin Cam 2005-17 & Sportster 2005-2021. +.001in. Outside Diameter DNA-21280250 * Includes Front & RearCast Iron: After chemically separating several samples of cast iron material , analysis and evaluating the test data, we decided to have our own specification of cast iron made exclusively , us. We specify elements such as carbon, silicon, manganese, nickel, chromium, copper and sulfur to produce a highly pearlitic structure with dense fine grains , excellent wear resistance. * OD = 0. 5630" (+0. 001" Oversize) * ID = 0. 2750" Matching Exhaust Guide #