S&S 131" Big bore kit M8 Cylinder color finish:Wrinkle Black with Fin Highlights Used to lock the primary

Used to lock the primary drive to allow you to remove the compensator nut/bolt and/or the clutch hub nut

5" Long when opened up

Simply flip the run switch and press this button

Socket and collar are heat treated to 43 degrees HRC

Responds very well to increased bore and or compression

S&S 131" Big bore kit M8 Cylinder color finish:Wrinkle Black with Fin Highlights Used to lock the primaryS&S has been building big bore kits since the 60s and has it down to an absolute science. Our latest efforts are aimed at the Milwaukee Eight platform (2017 and newer big twins) and open up a whole new level of performance for these engines. Combining a new design forged piston with their 4. 25 cylinders to net a tire melting 131 cubic inches when paired with their 4. 625 stroker crank. We build our big bore kits and cranks to much tighter tolerances