Overview

S&S Cycle M8 132 in. Big Bore Kits

S&S Cycle M8 132 in. Big Bore kits are premium, bolt-on performance upgrades designed for 2017-current Harley-Davidson® Milwaukee-Eight 114 and 117 cu. in. engines, increasing displacement to 132 cu. in. (2163cc). These kits feature 4.320 in. bore cylinders, typically producing appx. 11:1 compression, without requiring engine case machining.

Key details:

* Maximum displacement: Enables the largest possible displacement for M8 engines without needing to bore the stock crankcases
* Bolt-on installation: Simplifies installation by retaining factory engine height, avoiding the need for engine removal
* Performance focus: Designed to produce significant increases in horsepower and torque, often paired with high-lift cams and improved exhaust systems
* High-quality components: Includes forged pistons, premium piston rings, and aluminum cylinders with cast iron liners for better durability
* Finish options: Available in finishes that match stock engines, including black and granite, maintaining a "sleeper" look
* Commonly included components
-- 4.320 in. Big Bore cylinders
-- Matched forged pistons and rings
-- MLS (Multi-Layered Steel) head gaskets
-- S&S precision lifters and Quickee pushrods
-- Cam cover badge
* These kits are often used to upgrade to a Stage IV-style performance level, providing a massive torque boost. They are well-regarded for making high-horsepower, reliable builds on pump gas, especially when paired with proper supporting mods like 2-1 exhaust systems.

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