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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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£21.56
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Cometic Middle Rocker Cover Gasket. Rubber – 1984–1999 Evo Big Twin; 1986–2006 XL…

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Cometic Middle Rocker Cover Gasket. Rubber – 1984–1999 Evo Big Twin; 1986–2006 XL… OEM replacement reference 17358-84A Fitment 84-99 Evo Big Twin; ...

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£33.21
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£31.61
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£31.61

Cometic Lower Rocker Cover Gasket. Cork – 1984–1991 Big Twin

Only 2 left!

Cometic Lower Rocker Cover Gasket. Cork – 1984–1991 Big Twin OEM replacement reference 17355-84. Fitment 84-91 Big Twin (NU) Product Details Bran...

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Cometic Lower Rocker Cover Gasket. Rubber – 1984–1991 Big Twin

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Cometic Lower Rocker Cover Gasket. Rubber – 1984–1991 Big Twin Used between the rocker covers. OEM replacement reference 17355-84A Fitment 84-91 Bi...

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£31.61
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£31.61
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£33.21
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£31.61
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£31.61

Cometic Upper Rocker Cover Gasket. Cork – 1984–1991 Big Twin

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Cometic Upper Rocker Cover Gasket. Cork – 1984–1991 Big Twin OEM replacement reference 17356-84. Fitment 84-91 Big Twin (NU) Product Details Bran...

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£33.21
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Cometic Upper Rocker Cover Gasket. Rubber – 1984–1991 Big Twin

Only 2 left!

Cometic Upper Rocker Cover Gasket. Rubber – 1984–1991 Big Twin Used between the rocker covers. OEM replacement reference 17356-84A Fitment 84-91 Bi...

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£31.61
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£51.20
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£48.75
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£48.75

Cometic Cylinder Head Gasket Set. 4-1/8" .030" MLS – 1999–2017 Twin Cam with 4-1/8" Big Bore…

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Cometic Cylinder Head Gasket Set. 4-1/8" .030" MLS – 1999–2017 Twin Cam with 4-1/8" Big Bore… .030" thick MLS (Multi Layer Steel). Consists of a to...

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£51.20
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£48.75
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£48.75

Cometic Cylinder Head Gasket Set. 3-3/4" .040" MLS – 1984–1999 Evo Big Twin

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Cometic Cylinder Head Gasket Set. 3-3/4" .040" MLS – 1984–1999 Evo Big Twin .040" thick MLS (Multi Layer Steel). Consists of a top and bottom layer...

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£51.20
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£48.75
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£48.75

Cometic Cylinder Head Gasket Set. 4-1/8" .040" MLS – 1999–2017 Twin Cam with 4-1/8" Big Bore…

Out of stock

Cometic Cylinder Head Gasket Set. 4-1/8" .040" MLS – 1999–2017 Twin Cam with 4-1/8" Big Bore… .040" thick MLS (Multi Layer Steel). Consists of a to...

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£74.00
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£71.44
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£71.44

Cometic Cylinder Head. 3.5" Bore .060" MLS – 1984–1999 Big Twin; 1988–2022 XL…

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Cometic Cylinder Head. 3.5" Bore .060" MLS – 1984–1999 Big Twin; 1988–2022 XL… .060" thick MLS (Multi Layer Steel). Consists of a top and bottom la...

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£74.00
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£71.44
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£71.44
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£105.29
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£105.29
£103.83
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£103.83

Cometic Builders Cylinder Base Gasket Set. 3-1/2" Copper – 1984–1999 Evo Big Twin

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Cometic Builders Cylinder Base Gasket Set. 3-1/2" Copper – 1984–1999 Evo Big Twin 3-1/2" standard bore. With ''type A'' style gaskets. Includes two...

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£103.83
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£103.83
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£51.20
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£48.75
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£48.75

Cometic Gasket Set Cylinder Head. .040" MLS – 1966–1984 Shovelhed

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Cometic Gasket Set Cylinder Head. .040" MLS – 1966–1984 Shovelhed Fits both front & rear of 3-7/16" (74"/1200cc) & 3-1/2" (80"/1340cc) stan...

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£48.75
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£51.20
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£48.75
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£48.75

Cometic Cylinder Head .040" MLS – 1948–1965 Panhead

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Cometic Cylinder Head .040" MLS – 1948–1965 Panhead Standard bore replacement. MLS (Multi Layer Steel) consists of a top and bottom layer of stainl...

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£48.75
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£96.25
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£96.25
£92.92
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£92.92

Cometic Cylinder Head Gaskets. .043" Copper – L1973–1985 XL1000

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Cometic Cylinder Head Gaskets. .043" Copper – L1973–1985 XL1000 OEM replacement reference 16769-73. Fitment L73-85 XL1000 (NU) Product Details Br...

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£96.25
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£96.25
£92.92
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£92.92
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£131.64
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£131.64
£129.81
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£129.81

Cometic Cylinder Head Gaskets. .032" Copper – L1973–1985 XL1000

Only 2 left!

Cometic Cylinder Head Gaskets. .032" Copper – L1973–1985 XL1000 OEM replacement reference 16769-73. Fitment L73-85 XL1000 (NU) Product Details Br...

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£131.64
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£131.64
£129.81
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£131.64
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£129.81
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£129.81

Cometic Cylinder Head Gaskets. .020" Copper – 72-E73 XL1000

Only 2 left!

Cometic Cylinder Head Gaskets. .020" Copper – 72-E73 XL1000 OEM replacement reference 16769-72A. Fitment 72-E73 XL1000 (NU) Product Details Brand...

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£131.64
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£131.64
£129.81
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£129.81
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£125.03
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£125.03
£123.30
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£123.30

Cometic Cylinder Head Gaskets. .032" Copper – 1957–1971 XL900

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Cometic Cylinder Head Gaskets. .032" Copper – 1957–1971 XL900 Standard 3.00" bore. OEM replacement reference 16769-57. Fitment 57-71 XL900 (NU) Pro...

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£125.03
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£125.03
£123.30
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£123.30
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£51.20
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£51.20
£48.75
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£48.75

Cometic Cylinder Head Gasket Set. 3-5/8" MLS – 1966–1984 SHOVEL

Only 2 left!

Cometic Cylinder Head Gasket Set. 3-5/8" MLS – 1966–1984 SHOVEL .040" MLS (Multi Layer Steel). Consists of a top and bottom layer of embossed stain...

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£48.75

Cometic Cylinder Head Gaskets 3-3/4" Bore .045" MLS – 1999–2017 88"/96" Twin Cam A/B

Out of stock

Cometic Cylinder Head Gaskets 3-3/4" Bore .045" MLS – 1999–2017 88"/96" Twin Cam A/B MLS (Multi Layer Steel). Front & rear gasket for one engin...

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£48.75
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£51.20
£51.20 - £51.20
£51.20
£48.75
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£48.75

Cometic Cylinder Head. 3" Bore .040" MLS – 1986–2022 XL883

Out of stock

Cometic Cylinder Head. 3" Bore .040" MLS – 1986–2022 XL883 .040" MLS (Multi Layer Steel). Stock 3" bore. MLS (Multi Layer Steel) consists of a top ...

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£23.01
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£23.01
£21.91
£21.91 - £21.91
£21.91

Cometic Gasket Set Cylinder Head. .032" Copper – 1966–1984 Shovelhead

Only 2 left!

Cometic Gasket Set Cylinder Head. .032" Copper – 1966–1984 Shovelhead Fits both front & rear of 3-7/16" (74"/1200cc) & 3-1/2" (80"/1340cc) ...

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£23.01
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£23.01
£21.91
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£21.91
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£51.20
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£48.75
£48.75 - £48.75
£48.75

Cometic Cylinder Head Gaskets 3-3/4" Bore .051" MLS – 1999–2017 88"/96" Twin Cam A/B

Only 2 left!

Cometic Cylinder Head Gaskets 3-3/4" Bore .051" MLS – 1999–2017 88"/96" Twin Cam A/B MLS (Multi Layer Steel). Front & rear gasket for one engin...

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£48.75
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£48.75
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£51.20
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£48.75
£48.75 - £48.75
£48.75

Cometic Cylinder Head Gasket Set. 3-13/16" .040" MLS – 1984–1999 Evo Big Twin

Only 2 left!

Cometic Cylinder Head Gasket Set. 3-13/16" .040" MLS – 1984–1999 Evo Big Twin .040" thick MLS (Multi Layer Steel). Consists of a top and bottom lay...

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£51.20
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£51.20
£48.75
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£48.75

Cometic Cylinder Head Gasket Set. 3-13/16" .030" MLS – 1984–1999 Evo Big Twin

Out of stock

Cometic Cylinder Head Gasket Set. 3-13/16" .030" MLS – 1984–1999 Evo Big Twin .030" thick MLS (Multi Layer Steel). Consists of a top and bottom lay...

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£51.20
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£51.20
£48.75
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£48.75
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£51.20
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£51.20
£48.75
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£48.75

Cometic Cylinder Head Gasket Set. 3-5/8" .040" MLS – 1984–1999 Evo Big Twin; 1986–2005 XL…

Only 2 left!

Cometic Cylinder Head Gasket Set. 3-5/8" .040" MLS – 1984–1999 Evo Big Twin; 1986–2005 XL… .040" thick MLS (Multi Layer Steel). Consists of a top a...

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£48.75
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£48.75
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