WP550 (M8)
Description:
Meet the horsepower benchmark. The WP550-M8 Harley-Davidson Milwaukee-Eight camshaft is our original big-bore weapon, built for 124–132 cu in engines running 11.5-to-12:1 compression. A savage idle tells the story; crack 3,000 RPM and it pulls hard to 6,500 RPM, posting 170-plus HP with the right intake and exhaust. Street manners below 2,500 RPM stay intact, but this is not a bolt-in swap—plan on upgraded springs, pushrods, and a pro tune to let the cam breathe and dominate.
Key Features & Rider Benefits:
High Horsepower Focus: Specifically designed to produce very good mid to high RPM horsepower.
Aggressive Sound & Performance: Delivers an awesome aggressive lope at idle and a strong pull from 3000 to 6500 RPM.
Streetable Manners: Impressively maintains good drivability and low RPM manners despite its aggressive nature.
Durability by Design: Features a .550" valve lift for great valve train durability.
Beat Your Buddy: This cam was engineered to give you the edge and make serious numbers.
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Effective RPM Range: 2500 - 6500 RPM
Recommended Engine Displacements: Designed for 124" to 132" big bore M8 engines.
Ideal Rider: The rider who wants to make the number and beat their buddy; perfect for aggressive street performance in big bore builds.
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Valve Lift (Intake & Exhaust): .550" / .550"
Effective RPM Range: 2500 - 6500 RPM
Recommended Engine Displacements: 124" to 132" big bores with 11.5:1 or more compression.
Intake Closes (ABDC @ .050"): 48 degrees
Exhaust Closes (ATDC @ .050"): 11 degrees
Intake Duration (@ .050" lift): 242 degrees
Exhaust Duration (@ .050" lift): 254 degrees
Overlap (@ .050" lift): 25 degrees
Lobe Separation Angle (LSA): 111.5 degrees
Intake TDC Lift (@ TDC): .146"
Exhaust TDC Lift (@ TDC): .124"
Recommended Static Compression Ratio(s): 11.5:1 or more (12:1 being optimum for pump gas).
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This is NOT a bolt-in camshaft.
Valve Springs: Requires Upgraded Valve Springs.
Pushrods: Requires Adjustable Pushrods.
Lifters: Performance Lifters Recommended.
Throttle Body: Recommend to Upgrade.
Intake Manifold: Recommend to Upgrade.
Exhaust System: Performance Exhaust Recommended.
Air Cleaner: High Flow Air Cleaner Recommended.
Engine Tuning: A Full Professional Tune Recommended for Optimal Performance.
Pistons: Requires high performance / specific compression piston kit to achieve recommended compression ratios.
Oiling System: Compatible with stock components.
Critical Notes:
Recommend 124 or greater big bore kits with added compression ratio of at least 11.5:1, with 12:1 being optimum.
Not for use with VVT equipped engines.
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Compatible with Harley-Davidson 2017 to current M8 engines.
Excludes VVT models.
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Made in the USA.
M8 WP550
Specification | Valve Lift | Duration | Timing | Centerline | TDC |
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Intake | .550 | 242 | IO 14°, IC 48° | 107 | .146" |
Exhaust | .530 | 254 | EO 63°, EC 11° | 116 | .124" |
Duration and timing @ .050" cam lift - 1.6:1 RR