Truck / SUV
Jeep®
Restoration
Stock Replacement
Late Model Muscle
Tools
Gifts, Clothing, & More
Circle Track
Street Rod
Powersports
Paint & Body
Marine
Jr Dragster
Filters
S&S Cycle 128 in. Big Bore Kits
Not Yet Reviewed
The S&S Cycle 128 in. big bore kits are for Harley-Davidson® Milwaukee Eight engines to allow you to upgrade your M8 motor to the largest bore size possible—and wit
The S&S Cycle 128 in. big bore kits are for Harley-Davidson® Milwaukee Eight engines to allow you to upgrade your M8 motor to the largest bore size possible—and without required machining of your cases. So ... go big or go home! These upgrade kits are as simple as big power gets!
S&S Cycle 128 in. big bore kit features:
* 114 in. to 128 in. big bore kit
* Bolt-on kit, the largest cylinder bore possible without requiring machining of the crankcases
* Cylinders are constructed from premium aluminum castings wit cast-in iron liners
* Wrinkle black finish in highlighted and non-highlighted fin versions
* Easy i
S&S Cycle 128 in. big bore kit features:
* 114 in. to 128 in. big bore kit
* Bolt-on kit, the largest cylinder bore possible without requiring machining of the crankcases
* Cylinders are constructed from premium aluminum castings wit cast-in iron liners
* Wrinkle black finish in highlighted and non-highlighted fin versions
* Easy i
The S&S Cycle 128 in. big bore kits are for Harley-Davidson® Milwaukee Eight engines to allow you to upgrade your M8 motor to the largest bore size possible—and without required machining of your cases. So ... go big or go home! These upgrade kits are as simple as big power gets!
S&S Cycle 128 in. big bore kit features:
* 114 in. to 128 in. big bore kit
* Bolt-on kit, the largest cylinder bore possible without requiring machining of the crankcases
* Cylinders are constructed from premium aluminum castings wit cast-in iron liners
* Wrinkle black finish in highlighted and non-highlighted fin versions
* Easy installation; no need to bore or split existing cases—just swap the cylinders!
* 4.250 in. bore, 4.500 in. stroke
* Forged pistons
* 11:1 compression ratio
* All necessary gaskets and hardware required for installation included
S&S Cycle 128 in. big bore kit features:
* 114 in. to 128 in. big bore kit
* Bolt-on kit, the largest cylinder bore possible without requiring machining of the crankcases
* Cylinders are constructed from premium aluminum castings wit cast-in iron liners
* Wrinkle black finish in highlighted and non-highlighted fin versions
* Easy installation; no need to bore or split existing cases—just swap the cylinders!
* 4.250 in. bore, 4.500 in. stroke
* Forged pistons
* 11:1 compression ratio
* All necessary gaskets and hardware required for installation included
128" BIG BORE KIT M8 BLK
Part Number: SSY-910-0733
Not Yet Reviewed
Estimated Ship Date: Feb 16, 2026 if ordered today
Estimated Ship Date: Feb 16, 2026 if ordered today
