Engine
8170 parts
Harley engine parts for Evo, Twin Cam, Milwaukee-Eight and Sportster motors. Jump to cams, big bore kits, heads, gaskets and seals or engine covers. Free US shipping over $100.
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Out of stock
Kb Performance - KB425C.020 - Piston Kit - 3.750" +0.020" - 8.8:1 CR - 88" Twin Cam
KB Performance
$287.95Kb Performance - KB425C.020 - Piston Kit - 3.750" +0.020" - 8.8:1 CR - 88" Twin CamFeaturesManufactured from high-strength, T-5 heat-treated, 390 hypereutectic aluminum alloyAllows a tighter fit and...$287.95 -
Out of stock
Kb Performance - KB425C.STD - Piston Kit - 3.750" Standard - 8.8:1 CR - 88" Twin Cam
KB Performance
$287.95Kb Performance - KB425C.STD - Piston Kit - 3.750" Standard - 8.8:1 CR - 88" Twin CamFeaturesManufactured from high-strength, T-5 heat-treated, 390 hypereutectic aluminum alloyAllows a tighter fit and...$287.95 -
Out of stock
Kb Performance - KB425C.005 - Piston Kit - 3.750" +0.005" - 8.8:1 CR - 88" Twin Cam
KB Performance
$287.95Kb Performance - KB425C.005 - Piston Kit - 3.750" +0.005" - 8.8:1 CR - 88" Twin CamFeaturesManufactured from high-strength, T-5 heat-treated, 390 hypereutectic aluminum alloyAllows a tighter fit and...$287.95 -
Out of stock
Hastings - 2M6127030 - Piston Rings - 3.498" + 0.030" - 80" Big Twin
Hastings
$87.21Hastings - 2M6127030 - Piston Rings - 3.498" + 0.030" - 80" Big TwinFeaturesIncludes top compression rings, second compression rings, and oil control ringsTop Compression Rings are Barrel FaceHelps...$87.21 -
Out of stock
Goodridge - 822-06SCH - Oil Line Fitting - 90° - 1/4" NPT
Goodridge
MSRP: $15.47$14.95Goodridge - 822-06SCH - Oil Line Fitting - 90 - 1/4" NPTFeaturesFemale fittings match stainless steel braided hoses to form complete oil line assembliesMade in the USASpecsMSRP: $15.47$14.95 -
Out of stock
Goodridge - 823-06-02SCH - Oil Line Fitting - 45° - 1/8" NPT
Goodridge
MSRP: $15.47$14.95Goodridge - 823-06-02SCH - Oil Line Fitting - 45 - 1/8" NPTFeaturesFemale fittings match stainless steel braided hoses to form complete oil line assembliesMade in the USASpecsMSRP: $15.47$14.95 -
Out of stock
Cometic - C10377 - Head Gasket - 4.250" - .040" - Center Cooled - MLS - M8
Cometic
$64.95Cometic - C10377 - Head Gasket - 4.250" - .040" - Center Cooled - MLS - M8FeaturesHigh-quality products for long-term reliabilityManufactured from premium fuel-resistant materials that will not...$64.95 -
Out of stock
Cometic - C9917 - Top End Gasket - 4" - S&S - Fits S&S Big Twin w/ 4.00" bore, S&S rocker box gaskets
Cometic
$152.95Cometic - C9917 - Top End Gasket - 4" - S&SFeaturesEST gasket kit includes embossed stainless steel head, base and rocker gaskets covered with a proprietary rubber materialMaterial allows heat to be...$152.95 -
Out of stock
Cometic - C9933 - Head Gasket - S&S Super Sidewinder Plus - +4.125" - .040"
Cometic
$64.95Cometic - C9933 - Head Gasket - S&S Super Sidewinder Plus - +4.125" - .040"FeaturesHigh-quality products for long-term reliabilityManufactured from premium fuel-resistant materials that will not...$64.95 -
Out of stock
Bassani Xhaust - 1202P - O2 Sensor Port Plugs - 12 mm
Bassani Exhaust
$11.95Bassani Xhaust - 1202P - O2 Sensor Port Plugs - 12 mmFeaturesAllow non-sensor HD models to run newer-style exhaust systems equipped with O2 sensor portsSimply screw into non-essential sensor...$11.95 -
Out of stock
Bassani Xhaust - 102P2 - O2 Port Bung Adapter - 18 mm to 12 mm
Bassani Exhaust
$11.95Bassani Xhaust - 102P2 - O2 Port Bung Adapter - 18 mm to 12 mmFeaturesThreaded outer and inner adapters reduce O² sensor port from 18 mm to 12 mm allowing riders to use our exhaust pipes on select,...$11.95 -
Out of stock
Alloy Art - CRA-3 - Compression Release Adapter - 12 mm x 3/4"
Alloy Art
$20.95Alloy Art - CRA-3 - Compression Release Adapter - 12 mm x 3/4"FeaturesDesigned to be used in twin plug headsAccept .650”/10mm x 1.0 compression release valvesSold eachMade in the U.S.A.Specs$20.95 -
Out of stock
S&S Cycle - 33-5175 - Cam Install Kit - Chain Drive
S&S Cycle
$164.95S&S Cycle - 33-5175 - Cam Install Kit - Chain Drive Features Kits include all required parts needed when servicing or changing gear- or chain-drive cams in a Twin Cam motor Made in the U.S.A...$164.95 -
Out of stock
S&S Cycle - 33-4232 - Oil Pump Drive Gear
S&S Cycle
$69.95S&S Cycle - 33-4232 - Oil Pump Drive Gear Features Must be used as a set or with OEM equivalents Made in the U.S.A. Specs$69.95 -
Out of stock
S&S Cycle - 106-5428 - Billet Tappet Guides - Chrome - Big Twin
S&S Cycle
$504.95S&S Cycle - 106-5428 - Billet Tappet Guides - Chrome - Big TwinFeaturesMachined from solid billet aluminum with chrome finishPart of S&S's top-of-the-line engine kitsAvailable for engines with...$504.95 -
Out of stock
Revolution Performance, Llc - RP10193HB027014 - Gasket Kit - 139"/143" - M8
Revolution Performance
$89.95Revolution Performance, Llc - RP10193HB027014 - Gasket Kit - 139"/143" - M8Featuresrevolution performance logoMade in the U.S.A.revolution performance logoSpecs$89.95 -
Out of stock
S&S Cycle - 310-0911 - Cam Cover Gasket - M8
S&S Cycle
$21.95S&S Cycle - 310-0911 - Cam Cover Gasket - M8FeaturesCam cover gasket for M8Replacement Part for OEM Number(s): 25700370Specs$21.95 -
Out of stock
S&S Cycle - 50-7015-12 - Top Rubber Washer
S&S Cycle
$15.95S&S Cycle - 50-7015-12 - Top Rubber WasherFeaturesReplacement rocker box screw sealing washers.SpecsMaterial$15.95 -
Out of stock
Rocker Lockers - DK-RL-SPT-8606 - Rocker Lockers - XL
Rocker Lockers
$24.95Rocker Lockers - DK-RL-SPT-8606 - Rocker Lockers - XLFeaturesCenters the rocker plate eliminating different wear patterns on the rocker arm valveTapered design so that they lock themselves in and...$24.95 -
Out of stock
S&S Cycle - 106-5723 - Hydraulic Tensioner Block Off Kit - Fits 2017-2025 M-Eight, 2007-2017 Twin Cam and 06 Dyna
S&S Cycle
$16.95S&S Cycle - 106-5723 - Hydraulic Tensioner Block Off Kit Features Block off cover for S&S Complete Gear Drive Cam Chest Kit Specs$16.95 -
Out of stock
S&S Cycle - 33-4249 - Breather Gear Spacing Shim Kit - Big Twin
S&S Cycle
$49.95S&S Cycle - 33-4249 - Breather Gear Spacing Shim Kit - Big TwinFeaturesShim kit includes one of each thickness: 0.100\Made in the USASpecs$49.95 -
Out of stock
Revolution Performance, Llc - RP201-171WG - Cylinder Kit - 117" - Granite with Highlighted Fins - Twin Cam
Revolution Performance
$1,529.95Revolution Performance, Llc - RP201-171WG - Cylinder Kit - 117" - Granite with Highlighted Fins - Twin CamFeaturesrevolution performance logoAerospace-grade all-aluminum cylinder with...$1,529.95 -
Out of stock
Revolution Performance, Llc - RP201-171W - Cylinder Kit - 117" - Black with Highlighted Fins - Twin Cam
Revolution Performance
$1,529.95Revolution Performance, Llc - RP201-171W - Cylinder Kit - 117" - Black with Highlighted Fins - Twin CamFeaturesrevolution performance logoAerospace-grade all-aluminum cylinder with...$1,529.95 -
Out of stock
Revolution Performance, Llc - RP201-608W - Cylinder Kit - 128" - Big Bore - Black - 114"/117" M8
Revolution Performance
$1,529.95Revolution Performance, Llc - RP201-608W - Cylinder Kit - 128" - Big Bore - Black - 114"/117" M8Featuresrevolution performance logoAerospace-grade all-aluminum cylinder with nickel-silicon-carbide...$1,529.95 -
Out of stock
Revolution Performance, Llc - RP201-111W - Cylinder Kit - 98" - Big Bore - Black with Highlighted Fins - Twin Cam
Revolution Performance
$1,479.95Revolution Performance, Llc - RP201-111W - Cylinder Kit - 98" - Big Bore - Black with Highlighted Fins - Twin CamFeaturesrevolution performance logoAerospace-grade all-aluminum cylinder with...$1,479.95 -
Out of stock
Revolution Performance, Llc - RP201-103W - Cylinder Kit - 98" - Big Bore - Black with Highlighted Fins - Twin Cam
Revolution Performance
$1,479.95Revolution Performance, Llc - RP201-103W - Cylinder Kit - 98" - Big Bore - Black with Highlighted Fins - Twin CamFeaturesrevolution performance logoAerospace-grade all-aluminum cylinder with...$1,479.95 -
Out of stock
S&S Cycle - 900-4119RA - Forged Standard Rocker Arm
S&S Cycle
MSRP: $122.95$84.95S&S Cycle - 900-4119RA - Forged Standard Rocker ArmFeaturesAn economical solution for stock rebuilds, and mild performance upgradesForged from 8620 steel for greater strength than stock or cast...MSRP: $122.95$84.95 -
Out of stock
S&S Cycle - 90-4006 - Rocker Arm Shaft - Twin Cam/XL
S&S Cycle
$16.95S&S Cycle - 90-4006 - Rocker Arm Shaft - Twin Cam/XLFeaturesMade in the U.S.A.SpecsRiding StyleStreet$16.95 -
Out of stock
S&S Cycle - 310-1272 - Cam Chest Kit without Cams - Chain Drive - Black Pushrods - Twin Cam
S&S Cycle
$1,522.95S&S Cycle - 310-1272 - Cam Chest Kit without Cams - Chain Drive - Black Pushrods - Twin CamFeaturesOil Pump/Cam Plate:Precision machined from billet aluminumPassage plugs are removable for...$1,522.95 -
Out of stock
S&S Cycle - 310-1271 - Cam Chest Kit without Cams - Chain Drive - Chrome Pushrods - Twin Cam
S&S Cycle
$1,522.95S&S Cycle - 310-1271 - Cam Chest Kit without Cams - Chain Drive - Chrome Pushrods - Twin CamFeaturesOil Pump/Cam Plate:Precision machined from billet aluminumPassage plugs are removable for...$1,522.95 -
Out of stock
S&S Cycle - 310-1270 - Cam Chest Kit without Cams - Chain Drive - Black Pushrods - Twin Cam
S&S Cycle
$1,522.95S&S Cycle - 310-1270 - Cam Chest Kit without Cams - Chain Drive - Black Pushrods - Twin CamFeaturesOil Pump/Cam Plate:Precision machined from billet aluminumPassage plugs are removable for...$1,522.95 -
Out of stock
S&S Cycle - 330-0715 - Camshaft Kit - 540G Gear Drive - M8
S&S Cycle
$465.95S&S Cycle - 330-0715 - Camshaft Kit - 540G Gear Drive - M8 Features Designed to add even more torque to your big bore M8, for those that keep the revs below 6000 rpm when combined with 124" and...$465.95 -
Out of stock
S&S Cycle - 31-4004 - Ride Side Crankcase Bearing Race - Standard - Big Twin
S&S Cycle
$91.95S&S Cycle - 31-4004 - Ride Side Crankcase Bearing Race - Standard - Big TwinFeaturesMade in the U.S.A.SpecsProduc$91.95 -
Out of stock
S&S Cycle - 320-0397 - Flywheel Assembly - Twin Cam
S&S Cycle
$1,794.95S&S Cycle - 320-0397 - Flywheel Assembly - Twin CamFeaturesS&S 3-piece flywheels with integral main shafts are the strongest yet, made from 4140 steel and feature a larger 1.671" crankpinFlywheel...$1,794.95 -
Out of stock
S&S Cycle - 920-0115 - High Compression Piston Kit - +0.010" - 110" Twin Cam CVO Motor
S&S Cycle
MSRP: $587.95$521.95S&S Cycle - 920-0115 - High Compression Piston Kit - +0.010" - 110" Twin Cam CVO MotorFeaturesDeck height is 1.0985"Wristpin diameter is .927"Piston features a 12.5cc raised dome to achieve a...MSRP: $587.95$521.95 -
Out of stock
S&S Cycle - 31-6510 - Oil Filter Mounting Bracket Kit - Polished
S&S Cycle
MSRP: $239.95$195.95S&S Cycle - 31-6510 - Oil Filter Mounting Bracket Kit - PolishedFeaturesNo voids or other casting defects in the material to cause leaksPosition of the filter has been shifted slightly to give...MSRP: $239.95$195.95 -
Out of stock
Kb Performance - KB348.STD - Piston Kit - 3.875" Standard - 9.3:1 CR - 95" Twin Cam Big Bore
KB Performance
$295.95Kb Performance - KB348.STD - Piston Kit - 3.875" Standard - 9.3:1 CR - 95" Twin Cam Big BoreFeaturesManufactured from high-strength, T-5 heat-treated, 390 hypereutectic aluminum alloyAllows a tighter...$295.95 -
Out of stock
Kb Performance - KB305.030 - Piston Kit - Evolution
KB Performance
$246.95Kb Performance - KB305.030 - Piston Kit - EvolutionFeaturesManufactured from high-strength, T-5, heat-treated, 390 hypereutectic aluminum alloyAllow a tighter fit and longer piston and ring...$246.95 -
Out of stock
Kb Performance - KB272.010 - Piston Kit - 3.498" +0.010" - 10.0:1 CR - XL883 to 1200 Conversion
KB Performance
$246.95Kb Performance - KB272.010 - Piston Kit - 3.498" +0.010" - 10.0:1 CR - XL883 to 1200 ConversionFeaturesManufactured from high-strength, T-5 heat-treated, 390 hypereutectic aluminum alloyAllows a...$246.95 -
Out of stock
Kb Performance - KB305.020 - Piston Kit - Evolution
KB Performance
$246.95Kb Performance - KB305.020 - Piston Kit - EvolutionFeaturesManufactured from high-strength, T-5, heat-treated, 390 hypereutectic aluminum alloyAllow a tighter fit and longer piston and ring...$246.95
About Engine
Harley Engine Parts for Rebuilds and Performance
From a fresh gasket set to a full big bore build, we stock the Harley engine parts you need to rebuild, maintain or wake up your motor. Match parts to your engine: Evo, Twin Cam, Milwaukee-Eight and Sportster parts don't swap across.
Shop Engine Parts
- Camshafts
- Big bore kits
- Cylinders
- Heads
- Pushrods
- Lifters
- Rockers
- Gaskets & seals
- Oil pumps
- Oil filters
- Motor mounts
- Engine covers
We carry engine parts from S&S Cycle, Drag Specialties, V-Twin Mfg, Alloy Art, HardDrive and Rocker Lockers. Pair your build with an air cleaner and exhaust that let it breathe.
Not Sure It Fits?
Year, model and engine all matter, and plenty of parts look the same but aren't. If you can't tell whether something fits your bike, hit us up with your year and model and we'll check it before you order.