S&S CYCLE 136" BLACK M8 CRATE ENGINE 17-26 HARLEY DAVIDSON MODELS

S&S CYCLE 136" BLACK M8 CRATE ENGINE 17-26 HARLEY DAVIDSON MODELS

This is a special-order item and may not ship immediately.

Cylinder Heads

• High-flow cylinder heads with premium seats, guides, valves, springs, and seals
• +1mm oversized intake and exhaust valves
• Valves are .030" longer than stock for improved valvetrain geometry
• .605" max lift valve springs
• High-strength alloy cylinder head casting — improved strength at high temperatures
• Enlarged cooling passage around exhaust seats
• S&S exclusive breather boxes

Crankcase

• All premium quality components
• Patented dual-spray piston cooling jets
• Precision machined oil scraper
• Enlarged oil sump
• Contoured floor allows oil to easily drain back to sump

MK136 Engine Package

• Forged pistons
• S&S performance oil pump and cam support plate
• Premium tappets and tappet cuffs
• Billet aluminum covers
• Sprocket shaft spacer included
• Champion spark plugs
• Retains stock engine height
• Cam cover badge included
• Powder coat finish matches factory finish

Separately Required — Not Included

• ⚠️ CONFIRM: Verify with S&S or your installer whether throttle body, fuel system components, tuner/ECU module, oil lines, or other chassis-specific parts are required for your specific year/model

Tuning & Ignition

• ⚠️ CONFIRM: Fuel system and ECU/tuner requirements not confirmed in product documentation — verify with S&S or your installer before purchasing
• Professional dyno tuning is expected for a 136" displacement build — confirm scope with your installer

Installation Scope

• Fits 2017–2024 Harley-Davidson® M8 models
• Retains stock engine height — no frame modifications required
• ⚠️ CONFIRM: Professional installation strongly recommended — confirm scope and model-year compatibility with your shop

Manufacturer Warranty

• ⚠️ CONFIRM: Warranty terms not confirmed in product documentation — please verify current S&S Cycle warranty coverage before purchase

Current Lead Time

• This is a special-order item and may not ship immediately
• ⚠️ CONFIRM: Contact us before ordering to verify current availability and estimated ship date

Pre-Purchase Confirmation

Before placing your order, please confirm the following with our team:

• This engine is compatible with your specific 2017–2024 M8 model and configuration
• You have a tuner/ECU plan and any required supporting parts sourced
• You have a qualified installer lined up
• You understand current lead time (special order) and warranty terms

Contact us to confirm compatibility and availability before purchasing.