Skip to content
Find us Hours of Business Email Us Shipping Cookie policy Returns Terms & Conditions Privacy Policy Refunds

Engine & Performance

Choose from Engine & Performance products for Harley-Davidson, American V-twin and compatible motorcycle applications. Across the range you will find products for engine components. Compatibility varies, so match the stated model, year and technical details before ordering.

Filters

Sold out
£8.54
£8.54 - £8.54
£8.54
£7.37
£7.37 - £7.37
£7.37

Gardner-Westcott Exh Header Mount, OEM Style – 2002–2017 V-Rod

Out of stock

Gardner-Westcott Exh Header Mount, OEM Style – 2002–2017 V-Rod 514567 acorn Fitment 02-17 V-Rod (NU) Product Details Brand: Gardner-Westcott Cat...

View full details
£8.54
£8.54 - £8.54
£8.54
£7.37
£7.37 - £7.37
£7.37
Sold out
Save 8% Save %
£39.18
£39.18 - £39.18
£39.18
£36.06
£36.06 - £36.06
£36.06

Manley Valve Key Set (8) – 1936–1947 Knucklehead; 1948–1965…

Only 2 left!

Manley Valve Key Set (8) – 1936–1947 Knucklehead; 1948–1965… Stock style replacement. Heat treated; black oxided and 100% machined from a special c...

View full details
£39.18
£39.18 - £39.18
£39.18
£36.06
£36.06 - £36.06
£36.06
Save 8% Save %
Save 1% Save %
£136.77
£136.77 - £136.77
£136.77
£134.86
£134.86 - £134.86
£134.86

Manley Valve Spring Kit. Steel. Std to .550" Lift – 1984–1999 Evo Big Twin; 1999–2004 Twin…

Only 1 left!

Manley Valve Spring Kit. Steel. Std to .550" Lift – 1984–1999 Evo Big Twin; 1999–2004 Twin… Steel top collars and a spring set. Can be used as a di...

View full details
£136.77
£136.77 - £136.77
£136.77
£134.86
£134.86 - £134.86
£134.86
Save 1% Save %
Save 1% Save %
£245.83
£245.83 - £245.83
£245.83
£242.41
£242.41 - £242.41
£242.41

Manley High Lift Valve Spring Kit. .500" to .650" Lift – 1966–1984 Shovelhead

Only 2 left!

Manley High Lift Valve Spring Kit. .500" to .650" Lift – 1966–1984 Shovelhead Includes titanium top collars; steel lower collars; valve springs and...

View full details
£245.83
£245.83 - £245.83
£245.83
£242.41
£242.41 - £242.41
£242.41
Save 1% Save %
Save 8% Save %
£39.18
£39.18 - £39.18
£39.18
£36.06
£36.06 - £36.06
£36.06

Manley Valve Key Set (8) – 1957–1985 XL Sportster; 1937–1948…

Only 2 left!

Manley Valve Key Set (8) – 1957–1985 XL Sportster; 1937–1948… Stock replacement. Heat treated; black oxided and 100% machined from a special chromo...

View full details
£39.18
£39.18 - £39.18
£39.18
£36.06
£36.06 - £36.06
£36.06
Save 8% Save %
Save 1% Save %
£205.58
£205.58 - £205.58
£205.58
£202.72
£202.72 - £202.72
£202.72

Manley Valve Spring Kit. Titanium. Std to .650" Lift – 1984–1999 Evo Big Twin; 1999–2004 Twin…

Only 2 left!

Manley Valve Spring Kit. Titanium. Std to .650" Lift – 1984–1999 Evo Big Twin; 1999–2004 Twin… Titanium top collars and a spring set. Can be used a...

View full details
£205.58
£205.58 - £205.58
£205.58
£202.72
£202.72 - £202.72
£202.72
Save 1% Save %
Save 1% Save %
£151.59
£151.59 - £151.59
£151.59
£149.48
£149.48 - £149.48
£149.48

Manley Valve Spring Kit. Stock to .495" Lift – 1966–1979 Shovelhead

Only 2 left!

Manley Valve Spring Kit. Stock to .495" Lift – 1966–1979 Shovelhead Includes steel top collars; steel lower collars and valve springs. No machining...

View full details
£151.59
£151.59 - £151.59
£151.59
£149.48
£149.48 - £149.48
£149.48
Save 1% Save %
Save 1% Save %
£221.82
£221.82 - £221.82
£221.82
£218.73
£218.73 - £218.73
£218.73

Manley Valve Spring. Stock to .495" Lift – 1966–1979 Shovelhead

Only 2 left!

Manley Valve Spring. Stock to .495" Lift – 1966–1979 Shovelhead Includes titanium top collars; steel lower collars and valve springs. No machining ...

View full details
£221.82
£221.82 - £221.82
£221.82
£218.73
£218.73 - £218.73
£218.73
Save 1% Save %
Save 1% Save %
£132.01
£132.01 - £132.01
£132.01
£130.17
£130.17 - £130.17
£130.17

Manley Valve Spring Kit. Std to .490" Lift – 1957–1985 XL Sportster

Only 3 left!

Manley Valve Spring Kit. Std to .490" Lift – 1957–1985 XL Sportster Incl. steel top collars and dual spring style valve springs. No machining requi...

View full details
£132.01
£132.01 - £132.01
£132.01
£130.17
£130.17 - £130.17
£130.17
Save 1% Save %
Sold out
£97.80
£97.80 - £97.80
£97.80
£93.12
£93.12 - £93.12
£93.12

Manley Severe Duty Stainless Valves, Intake. Conversion – 1986–2003 XL883. For Full 883-1200…

Out of stock

Manley Severe Duty Stainless Valves, Intake. Conversion – 1986–2003 XL883. For Full 883-1200… Used for 883-1200 conversion. Valve length is same as...

View full details
£97.80
£97.80 - £97.80
£97.80
£93.12
£93.12 - £93.12
£93.12
Sold out
Save 8% Save %
£70.26
£70.26 - £70.26
£70.26
£64.66
£64.66 - £64.66
£64.66

Manley Race Master Exhaust Valve Set. STD – 1984–1999 Evo Big Twin

Only 2 left!

Manley Race Master Exhaust Valve Set. STD – 1984–1999 Evo Big Twin Quality replacement valves; lower priced than the Manley ''Severe Duty'' valves....

View full details
£70.26
£70.26 - £70.26
£70.26
£64.66
£64.66 - £64.66
£64.66
Save 8% Save %
Save 5% Save %
£95.87
£95.87 - £95.87
£95.87
£91.28
£91.28 - £91.28
£91.28

Manley Severe Duty Stainless Valves, Intake. STD – 1957–1969 XL Sportster

Only 2 left!

Manley Severe Duty Stainless Valves, Intake. STD – 1957–1969 XL Sportster Standard size replacement. Dimensions: 1.813" head dia. x .309" stem dia....

View full details
£95.87
£95.87 - £95.87
£95.87
£91.28
£91.28 - £91.28
£91.28
Save 5% Save %
£75.94 - £75.94
£75.94
£76.52
£76.52 - £76.52
£76.52

James Gaskets Top End Gasket Kit. Shovelhead – 1966–1984 Shovelhead

Only 5 left!

James Gaskets Top End Gasket Kit. Shovelhead – 1966–1984 Shovelhead .045" blue PTFE coated 3-7/16"/3.5" bore head gaskets; 0.030" cylinder base gas...

View full details
£75.94 - £75.94
£75.94
£76.52
£76.52 - £76.52
£76.52
£39.14 - £39.14
£39.14
£39.44
£39.44 - £39.44
£39.44

James Gaskets Top End Gasket Kit. XL900 – 1957–1971 XL900

Only 3 left!

James Gaskets Top End Gasket Kit. XL900 – 1957–1971 XL900 With 0.045" PTFE coated head gaskets; 0.030" paper cylinder base gaskets. Includes all ot...

View full details
£39.14 - £39.14
£39.14
£39.44
£39.44 - £39.44
£39.44
£144.94 - £144.94
£144.94
£148.21
£148.21 - £148.21
£148.21

James Gaskets Motor Gasket Kit. Fire-ring Head Gaskets, Shovel – 1966–1984 4-Speed Shovelhead

Only 3 left!

James Gaskets Motor Gasket Kit. Fire-ring Head Gaskets, Shovel – 1966–1984 4-Speed Shovelhead 0.045" Firering® head gaskets; RCM (Rubber Coated Met...

View full details
£144.94 - £144.94
£144.94
£148.21
£148.21 - £148.21
£148.21
£120.76 - £120.76
£120.76
£123.49
£123.49 - £123.49
£123.49

James Gaskets Motor Gasket Kit. Shovelhead – 1966–1984 4-Speed Shovelhead

Only 3 left!

James Gaskets Motor Gasket Kit. Shovelhead – 1966–1984 4-Speed Shovelhead Incl. 0.045" Teflon® coated head gaskets; fiber reinforced paper base gas...

View full details
£120.76 - £120.76
£120.76
£123.49
£123.49 - £123.49
£123.49
£87.23 - £87.23
£87.23
£87.90
£87.90 - £87.90
£87.90

James Gaskets Motor Gasket Kit. Panhead – 1948–1965 74 CuI (1200cc) Panhead

Only 3 left!

James Gaskets Motor Gasket Kit. Panhead – 1948–1965 74 CuI (1200cc) Panhead Includes 0.045" Blue PTFE head gaskets; includes manifold O-rings; cork...

View full details
£87.23 - £87.23
£87.23
£87.90
£87.90 - £87.90
£87.90
£118.94 - £118.94
£118.94
£121.62
£121.62 - £121.62
£121.62

James Gaskets Motor Gasket & Seal Kit. 900cc XL – 1957–1971 XL Sportster 900

Only 3 left!

James Gaskets Motor Gasket & Seal Kit. 900cc XL – 1957–1971 XL Sportster 900 0.045" coated cylinder head gaskets. Includes all required gaskets...

View full details
£118.94 - £118.94
£118.94
£121.62
£121.62 - £121.62
£121.62
£42.79 - £42.79
£42.79
£43.11
£43.11 - £43.11
£43.11

James Gaskets Top End Gasket Kit. Panhead – 1948–1965 Panhead

Only 3 left!

James Gaskets Top End Gasket Kit. Panhead – 1948–1965 Panhead Incl. 0.045" PTFE coated head gaskets; 0.030" base gaskets. Includes both 1/32" &...

View full details
£42.79 - £42.79
£42.79
£43.11
£43.11 - £43.11
£43.11
£57.05 - £57.05
£57.05
£57.49
£57.49 - £57.49
£57.49

James Gaskets Top End Gasket Kit. Knuckle – 1938–1947 E; EL (1000cc / 61") and F; FL…

Only 3 left!

James Gaskets Top End Gasket Kit. Knuckle – 1938–1947 E; EL (1000cc / 61") and F; FL… With 0.045" PTFE coated 3-5/16" bore head gaskets; and .020" ...

View full details
£57.05 - £57.05
£57.05
£57.49
£57.49 - £57.49
£57.49
Save 9% Save %
£46.69
£46.69 - £46.69
£46.69
£42.43
£42.43 - £42.43
£42.43

Colony Primary Cover Mount Kit. Acorn – 1980–1984 FLT/Touring; 1982–1984 FXR

Only 2 left!

Colony Primary Cover Mount Kit. Acorn – 1980–1984 FLT/Touring; 1982–1984 FXR Colony primary cover mount kit. Acorn Fitment 80-84 FLT/Touring; 82-84...

View full details
£46.69
£46.69 - £46.69
£46.69
£42.43
£42.43 - £42.43
£42.43
Save 9% Save %
Save 1% Save %
£43.89
£43.89 - £43.89
£43.89
£43.36
£43.36 - £43.36
£43.36

Colony Panhead Rocker Cover Screw Kit. Chrome Hex. Long – 1948–1965 Panhead

Only 2 left!

Colony Panhead Rocker Cover Screw Kit. Chrome Hex. Long – 1948–1965 Panhead Chrome plated. OEM style reproduction hex bolt with flange. Used to mou...

View full details
£43.89
£43.89 - £43.89
£43.89
£43.36
£43.36 - £43.36
£43.36
Save 1% Save %
£26.28 - £26.28
£26.28
£30.29
£30.29 - £30.29
£30.29

Colony Oil Pump Mount Kit, OEM Style – 1968–1978 Big Twin

Only 2 left!

Colony Oil Pump Mount Kit, OEM Style – 1968–1978 Big Twin Chrome hex Fitment 68-78 Big Twin (NU) Product Details Brand: Colony Category: MOTOR P...

View full details
£26.28 - £26.28
£26.28
£30.29
£30.29 - £30.29
£30.29
£21.70 - £21.70
£21.70
£25.18
£25.18 - £25.18
£25.18

Jims Lock Nuts for Tappet Adjuster Screw – 1915–1985 All H-D

Only 2 left!

Jims Lock Nuts for Tappet Adjuster Screw – 1915–1985 All H-D 9/32"-32 threaded. Fits all tappets that take 9/32-32 threaded adjusting screws. Repla...

View full details
£21.70 - £21.70
£21.70
£25.18
£25.18 - £25.18
£25.18

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare