S&S CYCLE SH93 Engine 31-9905

The S&S SH93 is a fully-assembled, turnkey 93-cubic-inch engine built specifically for 1970–84 Harley-Davidson big twins. If you're restoring a classic or building a retro custom, this engine eliminates the guesswork of sourcing individual components—everything is engineered and tested to work together from day one. You get S&S's reputation for reliability and performance without the fabrication headaches.

Built with a natural crankcase and black powder-coated cylinders, the SH93 delivers the aesthetic authenticity that vintage-focused builders demand, while its 8.5:1 compression ratio and hydraulic valve train with roller rockers ensure smooth, dependable operation across a wide rpm range. The included Super E carburetor and classic teardrop air cleaner complete the retro package—no custom intake sourcing required.

• Displacement: 93 cubic inches
• Bore × stroke: 3-5/8" × 4-1/2"
• Compression ratio: 8.5:1
• Forged pistons (S&S)
• Super Stock cylinder heads
• CNC-machined billet cam cover
• Hydraulic valve train
• Roller rocker arms
• Super Stock single-fire ignition
• Super E carburetor included
• Teardrop air cleaner included
• Oil filter mount (generator location)
• Natural crankcase finish
• Black powder-coat cylinders
• Fits: 1970–84 HD big twin
• Fitment: Alternator-style primary only
• Installation: Bolt-on assembly
• Warranty: 2 years