S&S Cycle SH93 Shovelhead Engine for 1966-1984 Harley-Davidson Big Twin

S&S Cycle SH93 Shovelhead Engine for 1966-1984 Harley-Davidson Big Twin

The S&S SH93 gives a tired Shovelhead a second life that outperforms the original in every way that matters — more displacement, a modern hydraulic valve train, and single-fire electronic ignition that starts clean and pulls hard, all wrapped in the classic look that made these machines worth keeping in the first place.

Key Features

• Larger displacement than stock for a meaningful performance increase over a rebuilt original
• Modern hydraulic valve train with S&S forged roller rocker arms for quiet, low-maintenance operation
• S&S Super Stock single-fire electronic ignition for reliable starts and improved combustion efficiency
• S&S 585 camshaft for strong power and torque across the rpm range
• S&S Super E carburetor included
• S&S forged pistons at 8.5:1 compression
• Dual-plugged heads for improved combustion
• Natural crankcases with black powder-coated cylinders
• Polished billet rocker covers
• Alternator/Generator variant: cast gear cover with billet alternator nose cone; correct-length sprocket shaft for 1966-1969 stock primary and transmission
• S&S SH-series cam and tappet architecture based on 1984-1999 S&S design for proven long-term reliability
• Two-year warranty

Technical Specifications

• Displacement: 93 cubic inches
• Camshaft: S&S 585
• Pistons: S&S forged
• Compression Ratio: 8.5:1
• Carburetor: S&S Super E (included)
• Ignition: S&S Super Stock single-fire electronic (included)
• Valve Train: S&S hydraulic with forged roller rocker arms
• Heads: Dual-plugged
• Finish: Natural crankcases, black powder-coated cylinders, polished billet rocker covers
• Horsepower: 95.7 hp
• Torque: 96.9 ft-lbs
• Alternator/Generator Variant Dimensions (L x W x H): 27″ x 25″ x 20″
• Alternator Variant Dimensions (L x W x H): 26.5″ x 24.56″ x 20.06″
• Weight: 175 lbs
• Warranty: Two years

Fitment Notes

• Fits 1966-1984 Harley-Davidson Shovelhead Big Twin chassis and custom frames with alternator or alternator/generator-style primary
• Alternator/Generator variant (31-9917): Required for 1966-1969 generator-style chassis; includes correct-length sprocket shaft for stock primary and transmission. Also fits 1970-1984 alternator-style chassis and 1970-1999 custom Big Twin frames with alternator-style primary
• Alternator variant (31-9905): Fits 1970-1984 alternator-style Shovelhead chassis and 1970-1999 custom Big Twin frames with alternator-style primary
• Review the Fitment tab for a complete year and model breakdown