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WP475 (Drop-in M8)
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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
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Compatible with Harley-Davidson 2017 to current M8 engines.
Excludes VVT models.
Price: $345.00
WP550 (M8)
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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" / .530"
Recommended Compression Ratio: 11.5:1 or more (12:1 optimal)
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Compatible with Harley-Davidson 2017 to current M8 engines.
Excludes VVT models.
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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)
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Compatible with Harley-Davidson 2017 to current M8 engines.
Excludes VVT models.
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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+
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Compatible with Harley-Davidson 2017 to current M8 engines.
Excludes VVT models.
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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
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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)
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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+
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Compatible with Harley-Davidson 2017 to current M8 engines.
Excludes VVT models.
WP610 (M8)
Price: $345.00
WP580 (M8)
Price: $375.00
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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
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Compatible with Harley-Davidson 2017 to current M8 engines.
Excludes VVT models.
Price: $375.00