0.030in. Thick Cylinder Head & Base 0.014in. Gasket set. Fits Touring 2017up & Softail 2018up with OEM 114ci/117ci to 128ci & 4.250in. Big Bore Kit. - Cometic Gaskets Speedo 3-3/8" XL & FX & FXD'75-03 * Patent-pending hidden breathers are

* Patent-pending hidden breathers are o-ringed at the heads and exit out the mouth of the throttle body to provide efficient engine breathing

Softail 1990-2006

* Will not fit Road King or Trike models

Most Sportster 1987-2021 (39mm Tubes) Require:

0.030in. Thick Cylinder Head & Base 0.014in. Gasket set. Fits Touring 2017up & Softail 2018up with OEM 114ci/117ci to 128ci & 4.250in. Big Bore Kit. - Cometic Gaskets Speedo 3-3/8" XL & FX & FXD'75-03 * Patent-pending hidden breathers areFitment: * 2017up Milwaukee Eight * 4. 250 Bore * Typically used when upgrading OEM 114ci 117ci to 128ci * MLS 0. 030 thick Head Gaskets * Base Gaskets RC 0. 014 thick (OEM thickness) Tech Tips: * Use of these head gaskets without proper clearance checks can lead to catastrophic engine failure