Top End Gasket Kit. Fits Twin Cam 1999-2017 with 98 or 107ci, 3.937in. Big Bore Cylinders (0.030in.) SPE-U.GS41040 If you are this far

If you are this far in

* Shot-peened and hard anodized for improved durability

improves balance

* The entire seat has been shaved down for a flowing profile

Top End Gasket Kit. Fits Twin Cam 1999-2017 with 98 or 107ci, 3.937in. Big Bore Cylinders (0.030in.) SPE-U.GS41040 If you are this farFeatures & Benefits: * Fits 3. 927" & 3. 937" Bore. * Includes 0. 030" Head Gasket * Provides an additional . 2 bump in compression. Tech Tips: * Remember to check your clearances. * Will Not Fit Stage 6 S&S Kits. * Use of these head gaskets without proper clearance checks can lead to catastrophic engine failure. NOTE: TWIN COOLED HEAD GASKETS WILL RETRO TO AIR COOLED HEADS & CYLINDERS