Bolt-in power for your Milwaukee Eight engines, S&S 124” and 128” kits are simple and effective means of big gains for your big engine.

Each kit is designed specifically to work with the 107” or 114” engine to deliver reliable power with little more work required other than swapping out the pistons and cylinders. Otherwise, everything you need is included in the kit along with a set of well-written instructions. About the only thing you’ll need to do is adjust fuel delivery for the new configuration, break it in correctly and you’ll be smiling whenever you open up the throttle. We have a variety of fuel tuners that’ll do the job on our website here. And since you’d already be halfway into the engine, you might as well have an oil change kit on hand as well.

There’s no replacement for displacement! Take your 107” to a 124” or your 114” to a 128” big bore, in the simplest way possible with a bolt-in big bore kit from S&S!

These kits are available with all-black cylinders or black cylinders with highlighted fins. To order yours, simply call 888.575.6570, send us a PM here or email forums@partsgiant.com along with the model and year of your M8 and we’ll get back to you right away.