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WP475 (Drop-in M8)

    • Ideal for: The aggressive street rider.

    • Effective RPM: 2500 - 6000 RPM

    • Displacement: Stock 107", 114", 117" M8; also performs well in 124-128" big bore kits.

    • Valve Lift: .475" / .475"

    • Recommended Compression Ratio: Stock to 11:1

    • Compatible with Harley-Davidson 2017 to current M8 engines.

    • Excludes VVT models.

Price: $345.00

WP550 (M8)

    • Ideal for: The rider who wants to make the number and beat the guy in the lane next to them.

    • Effective RPM: 2500 - 6500 RPM

    • Displacement: 124" to 132" big bore M8 engines.

    • Valve Lift: .550" / .550"

    • Recommended Compression Ratio: 11.5:1 or more (12:1 optimal)

    • Compatible with Harley-Davidson 2017 to current M8 engines.

    • Excludes VVT models.

    • Ideal for: Full-size bagger with a big bore kit.

    • Effective RPM: 2500 - 6000 RPM

    • Displacement: 124" - 132" M8 engines; H-D 131" Crate Engine.

    • Valve Lift: .580" / .580"

    • Recommended Compression Ratio: 11:1 to 11.5:1 (11.5:1 optimal)

    • Compatible with Harley-Davidson 2017 to current M8 engines.

    • Excludes VVT models.

    • Ideal for: Hot Street / Strip.

    • Effective RPM: 3000 - 6800 RPM

    • Displacement: H-D SE 135" kit, 130" to 143" engines.

    • Valve Lift: .586" / .586"

    • Recommended Compression Ratio: 11.5:1+

    • Compatible with Harley-Davidson 2017 to current M8 engines.

    • Excludes VVT models.

    • Ideal for: Owner of a large displacement (143ci+) "hot street/strip" build.

    • Effective RPM: 3000 - 7000 RPM

    • Displacement: 143ci and larger.

    • Valve Lift: .600" / .600"

    • Recommended Compression Ratio: 12:1

    • Compatible with Harley-Davidson 2017 to current M8 engines.

    • Excludes VVT models.

Price: $345.00

WP586 (M8)

Price: $345.00

WP143-S (M8)

Price: $375.00

WP143 (M8)

    • Ideal for: Big-inch drag race builds.

    • Effective RPM: 3500 - 7000 RPM

    • Displacement: 143ci and larger high-compression engines.

    • Valve Lift: .600" / .600"

    • Recommended Compression Ratio: 13:1+

    • Compatible with Harley-Davidson 2017 to current M8 engines.

    • Excludes VVT models.

WP610 (M8)

Price: $345.00

WP580 (M8)

Price: $375.00

    • Ideal for: The competitive street/strip rider.

    • Effective RPM: 3000 - 7000 RPM

    • Displacement: 124", 128", 131" & 132" high-compression big bore kits.

    • Valve Lift: .600" / .600"

    • Recommended Compression Ratio: 12:1 or higher

    • Compatible with Harley-Davidson 2017 to current M8 engines.

    • Excludes VVT models.

Price: $375.00