S&S Cycle 2017+ M8 Models 4.5in Stroke 132in Big Bore Kit

We use UPS, FedEx, DHL, and USPS for deliveries. We are not responsible for any shipping problems and shall not be held liable for any "reasonable" delay beyond our advertised delivery time-frames. Shipment by Ground Courier can take up to 15 business days for delivery. Express Courier can take up to 3 business days for delivery. Shipping time frames are once the order has been processed. Due to high demand, order processing can take 5 to 7 business days.

The biggest Big Bore possible with a slip in kit! The S&S 4.320 in. bore cylinder kit takes your 107 in. M8 to 129 in. and the 114 in. to 132 in.