132" Big Bore Cylinder Kits / '17-'23 114"-117" M8

The S&S 132" Big Bore Kit takes a '17-'23 M8 114" or 117" motor to 132 cubic inches, the largest bore possible without altering the crankcase.

No Shipping to California.

132 inches is where the M8 crankcase runs out of room. S&S combines a 4.320" bore with an extended 4.5" stroke to reach it, and the significant part is what does not have to happen: no case boring, no machining, stock engine height retained. Starting from a 114 or 117 rather than a 107 is what makes this the largest of the bolt-on kits.

What Comes in the 132" Kit

Forged 11:1 pistons carry the compression. All required multi-layered steel head gaskets and hardware ship in the box, and a cam cover badge is included. The engine keeps its stock height and its original integrity throughout. Designed and made in the USA.

132" Big Bore Kit Specifications

• Fits '17-'23 M8 114" and 117" motors
• 132 cubic inch final displacement
• 4.320" bore with extended 4.5" stroke
• 11:1 forged pistons
• Largest bore achievable without altering the crankcase
• MLS head gaskets and hardware included
• Cam cover badge included
• Retains stock engine height
• Colors: Wrinkle Black or Black Granite, with or without highlighted cylinder fins
• Made in the USA

Before You Order the 132" Kit

⚠️ VERIFY that your motor is a 114" or 117" M8 in the '17-'23 range. This kit will not suit a 107" motor, which takes the 129" kit instead. A displacement change of this size requires retuning and may affect emissions compliance in your state.