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Cylinder Parts

Discover high-quality aftermarket Harley Davidson cylinder parts designed to enhance engine performance and reliability. Our extensive range includes cylinder studs, base nuts, head bolt kits, and cylinder base spacers, catering to Big Twins, Sportsters, and other Harley models. With a variety of sleek finishes, these parts provide a polished, custom look for your bike. Whether you're restoring a classic or upgrading a more recent model, ARH Custom has you covered. Shop now.

Showing 1 to 60 of 113 products in this section.

Streethog Cylinder Head/Base Nut 7/16-20; high Torque Style, Provides Extra Clearance For Big Bore Cylinders Fits Stock Bore As Well in Stainless Steel For 1936-1984 B.T. Models (STHO11P)

vehicle specificStreethog Cylinder Head/Base Nut 7/16-20; high Torque Style, Provides Extra Clearance For Big Bore Cylinders Fits Stock Bore As Well in Stainless Steel For 1936-1984 B.T. Models (STHO11P)

$10.73

Streethog Cylinder Head/Base Acorn Nut 7/16-20 UNF in Polished Finish For 1948-1984 B.T. Models (STHO20P)

vehicle specificStreethog Cylinder Head/Base Acorn Nut 7/16-20 UNF in Polished Finish For 1948-1984 B.T. Models (STHO20P)

$8.76

Colony Head Bolt Kit OEM Style Including Washers in Zinc Finish For 1973-1985 XL Models (9212-16-Z)

vehicle specificColony Head Bolt Kit OEM Style Including Washers in Zinc Finish For 1973-1985 XL Models (9212-16-Z)

$48.22

S&S Cylinder Stud Set For Late 1985-1999 Evo B.T. & S&S Evo Crankcases Models (31-2321)

vehicle specificS&S Cylinder Stud Set For Late 1985-1999 Evo B.T. & S&S Evo Crankcases Models (31-2321)

$103.75

Colony Cylinder Head Bolt Kit 12 Point Domed Heads in Chrome Finish For Late 1985-1991 B.T., 1986-1991 XL Models (2011-8)

vehicle specificColony Cylinder Head Bolt Kit 12 Point Domed Heads in Chrome Finish For Late 1985-1991 B.T., 1986-1991 XL Models (2011-8)

$132.73

Colony Cylinder Base Nut Kit Hex In Chrome Finish For 1930-1978 B.T. Models (8104-16)

vehicle specificColony Cylinder Base Nut Kit Hex In Chrome Finish For 1930-1978 B.T. Models (8104-16)

$29.31

Colony Cylinder Base Nut Kit, High-Torque No Washers, Provides Extra Space For Big Bore Cylinders But Fits Stock Bore Equally Well in Chrome Finish For 1936-1984 B.T. Models (8600-8)

vehicle specificColony Cylinder Base Nut Kit, High-Torque No Washers, Provides Extra Space For Big Bore Cylinders But Fits Stock Bore Equally Well in Chrome Finish For 1936-1984 B.T. Models (8600-8)

$39.07

Colony Cylinder Base Nut Kit Acorn in Chrome Finish For 1957-1985 XL, 1929-1973 45 Inch SV Models (7018-16)

vehicle specificColony Cylinder Base Nut Kit Acorn in Chrome Finish For 1957-1985 XL, 1929-1973 45 Inch SV Models (7018-16)

$24.41

S&S Head Bolt Kit in Black Oxide Coating Finish For 2018-2025 Softail & 2017-2025 Touring, Trikes Models (900-1006)

vehicle specificS&S Head Bolt Kit in Black Oxide Coating Finish For 2018-2025 Softail & 2017-2025 Touring, Trikes Models (900-1006)

$199.79

Colony Cylinder Head Bolt Kit 12 Point Domed Head in Chrome Finish For 1992-2017 B.T. (Excluding M8), 1992-2022 XL, 2008-2012 XR1200 Models (2012-8)

vehicle specificColony Cylinder Head Bolt Kit 12 Point Domed Head in Chrome Finish For 1992-2017 B.T. (Excluding M8), 1992-2022 XL, 2008-2012 XR1200 Models (2012-8)

$132.73

Colony Cylinder Base Nut Kit Hex Flanged in Chrome Finish For 1979-1984 1340CC B.T. Models (9100-8)

vehicle specificColony Cylinder Base Nut Kit Hex Flanged in Chrome Finish For 1979-1984 1340CC B.T. Models (9100-8)

out of stock
$35.32

Colony Cylinder Base Nut Kit Hex in Parkerized Finish For 1957-1985 XL, 1929-1973 45 Inch SV Models (9624-16)

vehicle specificColony Cylinder Base Nut Kit Hex in Parkerized Finish For 1957-1985 XL, 1929-1973 45 Inch SV Models (9624-16)

$17.50

S&S Head Bolt Kit 12 Point Including Washers in Zinc Finish For 1948-1984 B.T. Models (93-3024)

vehicle specificS&S Head Bolt Kit 12 Point Including Washers in Zinc Finish For 1948-1984 B.T. Models (93-3024)

$118.27

Colony Head Bolt Washer Set in Black Parkerized Finish For All H-D Side Valve With Cast Iron Heads Models (2010-10)

vehicle specificColony Head Bolt Washer Set in Black Parkerized Finish For All H-D Side Valve With Cast Iron Heads Models (2010-10)

$9.53

Colony Head Bolt Kit OEM Style Including Washers in Chrome Finish For 1973-1985 XL Models (9211-16)

vehicle specificColony Head Bolt Kit OEM Style Including Washers in Chrome Finish For 1973-1985 XL Models (9211-16)

$55.34

Colony Cylinder Base Lockwashers 7/16 in Parkerized Finish For 1930-1978 OHV & SV B.T., 1957-1986 XL Models (9716-8)

vehicle specificColony Cylinder Base Lockwashers 7/16 in Parkerized Finish For 1930-1978 OHV & SV B.T., 1957-1986 XL Models (9716-8)

$6.28

S&S Cylinder Base Nuts 'High Torque' (8 Pack) No Washers, Provides Extra Space For Big Bore Cylinders But Fits Stock Bore Equally Well in Stainless Steel Finish For 1930-1984 B.T. Models (93-3063)

vehicle specificS&S Cylinder Base Nuts 'High Torque' (8 Pack) No Washers, Provides Extra Space For Big Bore Cylinders But Fits Stock Bore Equally Well in Stainless Steel Finish For 1930-1984 B.T. Models (93-3063)

out of stock
$105.81

Colony Cylinder Base Nut Kit Hex Flanged in Black Parkerized Finish For 1979-1984 1340CC B.T. Models (9102-8)

vehicle specificColony Cylinder Base Nut Kit Hex Flanged in Black Parkerized Finish For 1979-1984 1340CC B.T. Models (9102-8)

$28.71

Jims Forceflow Cylinder Head Cooler In Black For 2017-Up M8 Touring Models (5468)

vehicle specificJims Forceflow Cylinder Head Cooler In Black For 2017-Up M8 Touring Models (5468)

$778.60

Gardner Westcott Head Bolt Kit 12 Point Stock & Big Bore in Chrome Finish For 1948-1984 B.T. Models (A-74-10)

vehicle specificGardner Westcott Head Bolt Kit 12 Point Stock & Big Bore in Chrome Finish For 1948-1984 B.T. Models (A-74-10)

$95.18

Gardner Westcott Cylinder Base Nut Kit, Hex in Zinc Finish For 1957-1985 XL, 1929-1973 45 Inch SV Models (31-54)

vehicle specificGardner Westcott Cylinder Base Nut Kit, Hex in Zinc Finish For 1957-1985 XL, 1929-1973 45 Inch SV Models (31-54)

out of stock
$12.31

Colony Head Bolt Kit OEM Style Cast Iron Heads in Parkerized Finish For 1937-1948 74/80 Inch SV B.T., 1929-1950 45 Inch SV Models (9728-36)

vehicle specificColony Head Bolt Kit OEM Style Cast Iron Heads in Parkerized Finish For 1937-1948 74/80 Inch SV B.T., 1929-1950 45 Inch SV Models (9728-36)

out of stock
$105.41

Colony Cylinder Base Spacers in Chrome Finish For 1979-1984 1340CC B.T. Models (8860-8)

vehicle specificColony Cylinder Base Spacers in Chrome Finish For 1979-1984 1340CC B.T. Models (8860-8)

$31.04

Colony Cylinder Base Stud Set 8-Pack For 1930-1977 B.T. Models (8856-8)

vehicle specificColony Cylinder Base Stud Set 8-Pack For 1930-1977 B.T. Models (8856-8)

$42.43

Colony Cylinder Base Nut Kit Hex in Parkerized Finish For 1930-1978 B.T. Models (9623-16)

vehicle specificColony Cylinder Base Nut Kit Hex in Parkerized Finish For 1930-1978 B.T. Models (9623-16)

$19.86

S&S Cycle Super Stock Heads 3.625 Bore O-Ring Style Dual Plug Cylinder Head Kit In Natural Aluminium Finish For Harley Davidson 1966-1978 Big Twin Models (90-1491)

vehicle specificS&S Cycle Super Stock Heads 3.625 Bore O-Ring Style Dual Plug Cylinder Head Kit In Natural Aluminium Finish For Harley Davidson 1966-1978 Big Twin Models (90-1491)

$2,290.36

Colony Cylinder Head Bolt Kit 12 Point Domed Head, External Thread in Chrome Finish For Early 1984 - Late 1985 B.T. Models (2279-16)

vehicle specificColony Cylinder Head Bolt Kit 12 Point Domed Head, External Thread in Chrome Finish For Early 1984 - Late 1985 B.T. Models (2279-16)

$36.05

Colony Cylinder Base Studs 8x 3/8-16 To 3/8-24 x 1 13/16 Inch Stud For 1930-1973 45 Inch SV (Cylinder Base); 1965-1969 B.T. Models (A-16830-29A)

vehicle specificColony Cylinder Base Studs 8x 3/8-16 To 3/8-24 x 1 13/16 Inch Stud For 1930-1973 45 Inch SV (Cylinder Base); 1965-1969 B.T. Models (A-16830-29A)

$16.04

S&S Cylinder Stud Set For 1999-2017 TCA/B Models (31-2340)

vehicle specificS&S Cylinder Stud Set For 1999-2017 TCA/B Models (31-2340)

$103.75

Colony Cylinder Base Nut Kit High-Torque in Black Finish For 1957-1985 XL, 1929-1973 45 Inch SV Models (7624-8)

vehicle specificColony Cylinder Base Nut Kit High-Torque in Black Finish For 1957-1985 XL, 1929-1973 45 Inch SV Models (7624-8)

$34.06

Colony Cylinder Base Nut Kit Cap Style in Chrome Finish For 1930-1978 B.T. Models (8437-16)

vehicle specificColony Cylinder Base Nut Kit Cap Style in Chrome Finish For 1930-1978 B.T. Models (8437-16)

out of stock
$26.93

Colony Cylinder Base Nut Kit 'High Torque' No Washers, Provides Extra Space For Big Bore Cylinders But Fits Stock Bore Cylinders Equally Well in Black Oxide Finish For 1936-1984 B.T. Models (8601-8)

vehicle specificColony Cylinder Base Nut Kit 'High Torque' No Washers, Provides Extra Space For Big Bore Cylinders But Fits Stock Bore Cylinders Equally Well in Black Oxide Finish For 1936-1984 B.T. Models (8601-8)

$34.29

S&S Cylinder Stud Set 8 Used in One Engine For 1986-2017 XL, 2008-2012 XR1200, S&S 100/107/113 Inch 4 Inch Bore Evo Engines Models (31-2331)

vehicle specificS&S Cylinder Stud Set 8 Used in One Engine For 1986-2017 XL, 2008-2012 XR1200, S&S 100/107/113 Inch 4 Inch Bore Evo Engines Models (31-2331)

$103.75

Gardner Westcott Head Bolt Kit, 12 Point No Washers For 1984- Early 1985 Evo B.T. Models (A-80-10)

vehicle specificGardner Westcott Head Bolt Kit, 12 Point No Washers For 1984- Early 1985 Evo B.T. Models (A-80-10)

out of stock
$46.74

S&S Head Bolt Kit 100, 107, 78 Retro, 103 Evo Engines, 116/124 TC With OEM Heads For 1991-2017 B.T. (Excluding 2017 M8), 1991-2003 XL With 5 Inch Stroke. For OEM Heads Models (93-3016)

universal fitmentS&S Head Bolt Kit 100, 107, 78 Retro, 103 Evo Engines, 116/124 TC With OEM Heads For 1991-2017 B.T. (Excluding 2017 M8), 1991-2003 XL With 5 Inch Stroke. For OEM Heads Models (93-3016)

$158.72

S&S Head Bolt Kit 113, 116, 124 Engines For All Evo B.T. With S&S Heads, 1985-1990 Evo B.T. With OEM Heads, 1991-2003 XL 89 Inch 4 5/16 Stroke With OEM Heads Models (93-3013)

universal fitmentS&S Head Bolt Kit 113, 116, 124 Engines For All Evo B.T. With S&S Heads, 1985-1990 Evo B.T. With OEM Heads, 1991-2003 XL 89 Inch 4 5/16 Stroke With OEM Heads Models (93-3013)

$158.72

S&S Head Bolt Kit 116 Engine For 1991-2017 B.T. (Excluding 2017 M8) With OEM Heads Models (93-3071)

universal fitmentS&S Head Bolt Kit 116 Engine For 1991-2017 B.T. (Excluding 2017 M8) With OEM Heads Models (93-3071)

$158.72

S&S Head Bolt Kit 88/95/100/106/107/111/117/124 Engines For 1991-2017 B.T. (Excluding 2017 M8) With OEM Heads Models (93-3070)

vehicle specificS&S Head Bolt Kit 88/95/100/106/107/111/117/124 Engines For 1991-2017 B.T. (Excluding 2017 M8) With OEM Heads Models (93-3070)

$158.72

S&S head Bolt Kit 98, 103 Engines For All Evo B.T. With S&S Heads, 1985-1990 Evo B.T. With OEM Heads Models (93-3015)

universal fitmentS&S head Bolt Kit 98, 103 Engines For All Evo B.T. With S&S Heads, 1985-1990 Evo B.T. With OEM Heads Models (93-3015)

$158.72

Colony Cylinder Base Nut Kit Acorn Milled Hex Without Washers in Chrome Finish For 1978-1984 B.T. Models (7813-8)

vehicle specificColony Cylinder Base Nut Kit Acorn Milled Hex Without Washers in Chrome Finish For 1978-1984 B.T. Models (7813-8)

$39.88

Colony Cylinder Base Nut Kit Hex in Chrome Finish For 1957-1985 XL, 1929-1973 45 Inch SV Models (8106-16)

vehicle specificColony Cylinder Base Nut Kit Hex in Chrome Finish For 1957-1985 XL, 1929-1973 45 Inch SV Models (8106-16)

$32.10

Colony Cylinder Base Spacers in Black Oxide Models For 1979-1984 1340CC B.T. Models (8861-8)

vehicle specificColony Cylinder Base Spacers in Black Oxide Models For 1979-1984 1340CC B.T. Models (8861-8)

$22.03

Colony Cylinder Stud Set (Pack of 8) For Late 1985-1999 Evo B.T. Models (9424-8)

vehicle specificColony Cylinder Stud Set (Pack of 8) For Late 1985-1999 Evo B.T. Models (9424-8)

$111.63

Colony Cylinder Stud Set For 1986-2022 XL, 2008-2012 XR1200, S&S 100/107/113 Inch 4 Inch Bore Evo Engines Models (9507-8)

vehicle specificColony Cylinder Stud Set For 1986-2022 XL, 2008-2012 XR1200, S&S 100/107/113 Inch 4 Inch Bore Evo Engines Models (9507-8)

$98.51

Colony Head Bolt Kit Acorn Style For 1948-1983 B.T. Models (7153-20)

vehicle specificColony Head Bolt Kit Acorn Style For 1948-1983 B.T. Models (7153-20)

$83.00

Jims Left Main Seal Remover (5830)

vehicle specificJims Left Main Seal Remover (5830)

$303.89

KibbleWhite Precision Machining Cylinder Stud Set in Black Oxide Coated Finish For 1999-2017 TCA/B Models (20-20412)

vehicle specificKibbleWhite Precision Machining Cylinder Stud Set in Black Oxide Coated Finish For 1999-2017 TCA/B Models (20-20412)

$166.78

KibbleWhite Precision Machining Cylinder Stud Set STD Replacement For Late 1985-1999 Evo B.T. Models (20-2098)

vehicle specificKibbleWhite Precision Machining Cylinder Stud Set STD Replacement For Late 1985-1999 Evo B.T. Models (20-2098)

$175.96

Gardner Westcott Head Bolt Kit, 12 Point For Late 1973-1985 XL Models (A-20-17)

vehicle specificGardner Westcott Head Bolt Kit, 12 Point For Late 1973-1985 XL Models (A-20-17)

out of stock
$97.20

Jims Forceflow Cylinder Head Cooler In Chrome For 2017-Up M8 Touring Models (5469)

vehicle specificJims Forceflow Cylinder Head Cooler In Chrome For 2017-Up M8 Touring Models (5469)

$710.03

S&S Cylinder Base Stud Set 2.030 Inch OAL For 1930-1984 61/74/80 Inch OHV And SV B.T. Models (31-2328)

universal fitmentS&S Cylinder Base Stud Set 2.030 Inch OAL For 1930-1984 61/74/80 Inch OHV And SV B.T. Models (31-2328)

$55.55

S&S Head Bolt Kit 80/89/93/96/98 Evo Engines, OEM 88&95/OEM 96&103/100/106/107/117 TC Engines For 1991-2017 B.T. (Excluding 2017 M8), 1991-2003 XL With OEM Heads Models (93-3014)

universal fitmentS&S Head Bolt Kit 80/89/93/96/98 Evo Engines, OEM 88&95/OEM 96&103/100/106/107/117 TC Engines For 1991-2017 B.T. (Excluding 2017 M8), 1991-2003 XL With OEM Heads Models (93-3014)

$151.31

S&S Head Bolt Kit 88 Evo Engine, 111 TC Engine For 1991-2017 B.T. (Excluding 2017 M8) With OEM Heads Models (93-3010)

universal fitmentS&S Head Bolt Kit 88 Evo Engine, 111 TC Engine For 1991-2017 B.T. (Excluding 2017 M8) With OEM Heads Models (93-3010)

$106.87

Jims Cylinder Torque Plate Kit For 2017-Up M8 107 Inch & 114 Inch Touring Models (5829)

vehicle specificJims Cylinder Torque Plate Kit For 2017-Up M8 107 Inch & 114 Inch Touring Models (5829)

$758.00

Gardner Westcott Head Bolt & Cylinder Stud Kit, 12 Point For 1986 XL Only Models (A-80-101)

universal fitmentGardner Westcott Head Bolt & Cylinder Stud Kit, 12 Point For 1986 XL Only Models (A-80-101)

$382.14

Gardner Westcott Head Bolt Kit, 12 Point 900cc Models Including Washers in Chrome Finish For 1957-Early 1973 XL Models (A-20-18)

universal fitmentGardner Westcott Head Bolt Kit, 12 Point 900cc Models Including Washers in Chrome Finish For 1957-Early 1973 XL Models (A-20-18)

$89.79

Gardner Westcott Head Bolt Kit, Acorn 900cc Models, Including Washers in Chrome Finish For 1957- Early 1973 XL Models (50-94A)

universal fitmentGardner Westcott Head Bolt Kit, Acorn 900cc Models, Including Washers in Chrome Finish For 1957- Early 1973 XL Models (50-94A)

$121.32

Gardner Westcott Head Bolt Kit, Allen No Washers in Chrome Finish For 1984- Early 1985 B.T. Evo Models (C-80-10)

universal fitmentGardner Westcott Head Bolt Kit, Allen No Washers in Chrome Finish For 1984- Early 1985 B.T. Evo Models (C-80-10)

$32.91

Gardner Westcott Head Bolt/Cylinder Base Washer in Chrome Finish - 25 Pack 7/16 Inch ID - 3/4 Inch OD - 3/32 Inch Thick (10 Used) (23580-25 PACK)

universal fitmentGardner Westcott Head Bolt/Cylinder Base Washer in Chrome Finish - 25 Pack 7/16 Inch ID - 3/4 Inch OD - 3/32 Inch Thick (10 Used) (23580-25 PACK)

$78.91

Gardner Westcott Head Bolts Stock Style Hex OEM Style Hex Bolts With Washers in Chrome Finish For 1957- Eaerly 1973 XL Models (C-20-18H)

universal fitmentGardner Westcott Head Bolts Stock Style Hex OEM Style Hex Bolts With Washers in Chrome Finish For 1957- Eaerly 1973 XL Models (C-20-18H)

$56.28

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