910-0843A 129" big bore kit. Black cylinders / highlighted fins

This S&S 129-inch big bore kit is the ultimate bolt-in performance upgrade for 2017 to 2024 Milwaukee-Eight models originally equipped with the 107-inch engine. Pushing your displacement to 2102cc, this is the largest bore you can fit without the headache of boring out your stock crankcases or swapping to stroker flywheels. The kit maintains your stock engine height and works perfectly with original heads. You get a complete package including forged 4.320-inch pistons, black wrinkle powder-coated cylinders with highlighted fins to match the OEM finish, and high-quality Multi-Layer-Steel head gaskets. It even comes with an S&S cubic inch cam cover badge to show off what’s inside. While it’s designed for a straightforward installation, keep in mind that fuel injection tuning will be required to handle the massive increase in power and torque.