S&S CYCLE Big Bore Cylinder Kit — 132 cu in, 4.320 in bore, 4.500 in stroke, Wrinkle Black – 18-23 Softail, 21, 23 Touring, 17-23 Trike, 20-22 CVO

Upgrade displacement while preserving original engine serial numbers for factory identity and service continuity. 🔧

Includes MLS (Multi-Layered Steel) head gaskets to ensure reliable sealing and long-term durability.

Designed to retain stock engine height and use the stock bolt pattern for straightforward installation with the original crankcase.

Works with standard crankcases; not compatible with VVT models.