S&S 136" Big bore kit M8S&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. 320 cylinders to net a tire melting 136 cubic inches when paired with their 4. 625 stroker crank. We build our big bore kits and cranks to much tighter tolerances
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