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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.

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£115.11
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Cometic EST Top End Gasket Kit. Buell XB – 2002–2006 Buell XB

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Cometic EST Top End Gasket Kit. Buell XB – 2002–2006 Buell XB With MLS (Multi-Layer-Steel) .040" thick head gaskets. SLS (Single-Layer-Steel) cylin...

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£120.82
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£119.14
£119.14 - £119.14
£119.14

Cometic EST Top End Gasket Kit. Twin Cam 3-7/8" Bore – 1999–2017 95"/103" Twin Cam

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Cometic EST Top End Gasket Kit. Twin Cam 3-7/8" Bore – 1999–2017 95"/103" Twin Cam With MLS (Multi-Layer-Steel) .030" thick head gaskets. The SLS (...

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£120.82
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£119.14
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£119.14
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£120.82
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£120.82
£119.14
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£119.14

Cometic EST Top End Gasket Kit. Twin Cam 3-3/4" Bore – 1999–2017 88/96" Twin Cam

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Cometic EST Top End Gasket Kit. Twin Cam 3-3/4" Bore – 1999–2017 88/96" Twin Cam With .030" thick MLS (Multi-Layer-Steel) head gaskets; SLS (Single...

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£120.82
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£119.14
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£119.14
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£115.11
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£115.11
£113.51
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£113.51

Cometic EST Top End Gasket Kit. XL1200 – 1991–2003 XL1200

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Cometic EST Top End Gasket Kit. XL1200 – 1991–2003 XL1200 With 3.50" bore MLS (Multi-Layer-Steel) .040" thick head gaskets. SLS (Single-Layer-Steel...

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£113.51
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£115.11
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£113.51
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£113.51

Cometic EST Top End Gasket Kit. XL883 – 1991–2003 XL883

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Cometic EST Top End Gasket Kit. XL883 – 1991–2003 XL883 With 3.00" bore MLS (Multi-Layer-Steel) .040" thick head gaskets. SLS (Single-Layer-Steel) ...

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£115.11
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£113.51
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£113.51

Cometic EST Top End Gasket Kit. XL1200 – 1988–1990 XL1200

Only 2 left!

Cometic EST Top End Gasket Kit. XL1200 – 1988–1990 XL1200 With 3.50" bore MLS (Multi-Layer-Steel) .040" thick head gaskets. The SLS (Single-Layer-S...

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£113.51
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£115.11
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£113.51
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£113.51

Cometic EST Top End Gasket Kit. XL1100 – 1986–1987 XL1100

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Cometic EST Top End Gasket Kit. XL1100 – 1986–1987 XL1100 With 3.50" bore MLS (Multi-Layer-Steel) .040" thick head gaskets. The SLS (Single-Layer-S...

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£115.11
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£115.11
£113.51
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£113.51

Cometic EST Top End Gasket Kit. XL883 – 1986–1990 4-Speed XL883

Out of stock

Cometic EST Top End Gasket Kit. XL883 – 1986–1990 4-Speed XL883 With 3.00" bore MLS (Multi-Layer-Steel) .040" thick head gaskets. The SLS (Single-L...

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£115.11
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£115.11
£113.51
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£113.51
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£147.15
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£147.15
£145.11
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£145.11

Cometic EST Top End Gasket Kit. Twin Cam 3-7/8" Bore – 1999–2017 95"/103" Twin Cam

Only 2 left!

Cometic EST Top End Gasket Kit. Twin Cam 3-7/8" Bore – 1999–2017 95"/103" Twin Cam With MLS (Multi-Layer-Steel) .040" thick head gaskets. The SLS (...

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£147.15
£147.15 - £147.15
£147.15
£145.11
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£145.11
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£149.27
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£149.27
£147.19
£147.19 - £147.19
£147.19

Cometic EST Top End Gasket Kit. Twin Cam 3-3/4" Bore – 1999–2017 88/96" Twin Cam

Only 2 left!

Cometic EST Top End Gasket Kit. Twin Cam 3-3/4" Bore – 1999–2017 88/96" Twin Cam With MLS (Multi-Layer-Steel) .040" thick head gaskets. The SLS (Si...

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£149.27
£149.27 - £149.27
£149.27
£147.19
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£147.19
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£108.53
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£108.53
£107.02
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£107.02

Cometic EST Top End Gasket Kit. Shovelhead – 1966–1984 Shovelhead

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Cometic EST Top End Gasket Kit. Shovelhead – 1966–1984 Shovelhead With MLS (Multi-Layer-Steel) .040" thick head gaskets. The SLS (Single-Layer-Stee...

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£108.53
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£108.53
£107.02
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£108.53
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£108.53
£107.02
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£107.02

Cometic EST Top End Gasket Kit. Panhead – 1948–1965 Panhead

Out of stock

Cometic EST Top End Gasket Kit. Panhead – 1948–1965 Panhead EST (Extreme Sealing Technology) gasket set. With MLS (Multi-Layer-Steel) .040" thick h...

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£108.53
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£108.53
£107.02
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£139.12
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£139.12
£137.18
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£137.18

Cometic EST Top End Gasket Kit. Evo B.T. 3-13/16" Big Bore – 1992–1999 Evo Big Twin with 3-13/16" Big…

Out of stock

Cometic EST Top End Gasket Kit. Evo B.T. 3-13/16" Big Bore – 1992–1999 Evo Big Twin with 3-13/16" Big… With 3.812" bore MLS (Multi-Layer-Steel) .04...

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£139.12
£139.12 - £139.12
£139.12
£137.18
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£137.18
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£115.11
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£115.11
£113.51
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£113.51

Cometic EST Top End Gasket Kit. Evo B.T. 3-13/16" Big Bore – 1984–1991 Evo Big Twin with 3-13/16" Big…

Out of stock

Cometic EST Top End Gasket Kit. Evo B.T. 3-13/16" Big Bore – 1984–1991 Evo Big Twin with 3-13/16" Big… With 3.812" bore MLS (Multi-Layer-Steel) .04...

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£115.11
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£113.51
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£115.11
£115.11 - £115.11
£115.11
£113.51
£113.51 - £113.51
£113.51

Cometic EST Top End Gasket Kit. Evo B.T. 3-5/8" Big Bore – 1992–1999 Evo Big Twin with 3-5/8" Big…

Only 2 left!

Cometic EST Top End Gasket Kit. Evo B.T. 3-5/8" Big Bore – 1992–1999 Evo Big Twin with 3-5/8" Big… With 3.625" bore MLS (Multi-Layer-Steel) .040" t...

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£115.11
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£115.11
£113.51
£113.51 - £113.51
£113.51
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£142.86
£142.86 - £142.86
£142.86
£140.87
£140.87 - £140.87
£140.87

Cometic EST Top End Gasket Kit. Evo B.T. 3-5/8" Big Bore – 1984–1991 Evo Big Twin with 3-5/8" Big…

Only 2 left!

Cometic EST Top End Gasket Kit. Evo B.T. 3-5/8" Big Bore – 1984–1991 Evo Big Twin with 3-5/8" Big… With 3.625" bore MLS (Multi-Layer-Steel) .040" t...

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£142.86
£142.86 - £142.86
£142.86
£140.87
£140.87 - £140.87
£140.87
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£115.11
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£115.11
£113.51
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£113.51

Cometic EST Top End Gasket Kit. Evo B.T – 1984–1991 Evo Big Twin

Only 2 left!

Cometic EST Top End Gasket Kit. Evo B.T – 1984–1991 Evo Big Twin With standard 3.5" bore MLS (Multi-Layer-Steel) .040" thick head gaskets. The SLS ...

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£115.11
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£115.11
£113.51
£113.51 - £113.51
£113.51
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£151.96
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£151.96
£149.84
£149.84 - £149.84
£149.84

Cometic EST Motor Gasket Kit. Standard Bore – 1948–1965 74" (1200cc) Panhead

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Cometic EST Motor Gasket Kit. Standard Bore – 1948–1965 74" (1200cc) Panhead This EST (Extreme-Sealing-Technology) gasket set is complete with all ...

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£151.96
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£151.96
£149.84
£149.84 - £149.84
£149.84
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£197.69
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£197.69
£194.94
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£194.94

Cometic EST Motor Gasket Kit. 3-5/8 Big Bore – 1970–1984 Shovel 4-Speed

Only 2 left!

Cometic EST Motor Gasket Kit. 3-5/8 Big Bore – 1970–1984 Shovel 4-Speed This EST (Extreme-Sealing-Technology) gasket set is complete with all gaske...

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£197.69
£197.69 - £197.69
£197.69
£194.94
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£194.94
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£209.83 - £209.83
£209.83
£211.44
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£211.44

Cometic EST Motor Gasket Kit. Standard Bore – 1980–1984 Shovel FLT/Touring 5-Speed

Only 2 left!

Cometic EST Motor Gasket Kit. Standard Bore – 1980–1984 Shovel FLT/Touring 5-Speed This EST (Extreme-Sealing-Technology) gasket set is complete wit...

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£209.83 - £209.83
£209.83
£211.44
£211.44 - £211.44
£211.44
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£151.96
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£151.96
£149.84
£149.84 - £149.84
£149.84

Cometic EST Motor Gasket Kit. Standard Bore – 1970–1984 Shovel 4-Speed

Only 2 left!

Cometic EST Motor Gasket Kit. Standard Bore – 1970–1984 Shovel 4-Speed This EST (Extreme-Sealing-Technology) gasket set is complete with all gasket...

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£151.96
£151.96 - £151.96
£151.96
£149.84
£149.84 - £149.84
£149.84
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£179.12
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£179.12
£176.63
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£176.63

Cometic EST Motor Gasket Kit. Standard Bore – 1966–1969 Early Shovel Models

Only 2 left!

Cometic EST Motor Gasket Kit. Standard Bore – 1966–1969 Early Shovel Models This EST (Extreme-Sealing-Technology) gasket set is complete with all g...

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£179.12
£179.12 - £179.12
£179.12
£176.63
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£176.63
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£136.28
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£136.28
£134.38
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£134.38

Cometic EST Motor Only Gasket Kit. 3-7/8" Bore – 1999–2016 95"/103" Twin Cam A/B

Only 2 left!

Cometic EST Motor Only Gasket Kit. 3-7/8" Bore – 1999–2016 95"/103" Twin Cam A/B With .040" MLS (Multi Layer Steel) head gaskets. With 99-10 style ...

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£136.28
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£136.28
£134.38
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£134.38
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£133.34
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£133.34
£131.48
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£131.48

Cometic Motor Only Gasket Set. XL Sportster – 1982–1985 XL1000 Low Compression

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Cometic Motor Only Gasket Set. XL Sportster – 1982–1985 XL1000 Low Compression Low compression. With .063" copper head gaskets & .031" base gas...

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£133.34
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£133.34
£131.48
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£131.48
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