Collection:
Cylinders & Pistons
168 productsShop the range of aftermarket motorcycle engine products at Pro Class Custom Parts.
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Apparel
Brakes
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Brake Disc Rotors
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Brake Pads
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Brake Upgrades - Front
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Brake Upgrades - Rear
Cables & Hydraulic Lines
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Cables & Hyd. Lines - Black
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Cables & Hyd. Lines - Chromite
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Exhaust - Spare Parts Only
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- Mufflers (Street '15-20)
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Exhaust System 2:1
- Breakout (2:1)
- Dyna (2:1)
- Honda (2:1)
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- V-Rod (2:1)
- Yamaha (2:1)
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Exhaust System 2:2
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Fuel & Air Systems
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Air Cleaner Kits & Components
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Carburettor Kits & Components
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Fuel - Taps & Lines & Filters
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Inlet Manifolds & Clamps etc
Gasket Kits & Gaskets & Seals
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Gaskets Complete Engine Kits
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Gaskets Top End & Rocker
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Gaskets Transmission
Handlebars & Controls
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Hand Control Kits
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- Risers 1-1/4" Clamp - Black
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- Risers 1-1/8" Clamp - Black
- Risers 1-1/8" Clamp - Chrome
- Handlebars & Risers Indian
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Mirrors
Instruments & Gauges
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Gauges - Bagger & Dresser
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Oil+Volt+Temp & Other Gauges
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Speedo 3-3/8" Tank & Bar MT
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Speedo 4.5" Tank Mt 1936-03
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Speedo 4.5" Tank Mt 2004up
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Speedo Dash's & Bases & Other
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Speedo Drives+Sensors+Cables
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Speedos & Mts Custom App.
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Dual Seats
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Pillion Pads
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Sissy Bar Side Straps
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Solo Seats
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- Touring (FLH) 1991-2007 Solo Seats
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- Touring (FLH) 2024up Solo Seats
- Vintage(1936-84) Solo Seats
Suspension
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FXR
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Front Susp. Related
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Front Suspension: 35 & 39mm
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Front Suspension: 41mm
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Front Suspension: 49mm
- Rear Shocks Related - Universal
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Rear Shocks: Dyna
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Rear Shocks: FLH
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Rear Shocks: HD Street
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Rear Shocks: HD Trike
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Rear Shocks: Indian & Victory
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Rear Shocks: Metric
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Rear Shocks: Softail
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Rear Shocks: V-Rod
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Rear Shocks: Vintage
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Rear Shocks: XL'04up
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Universal Suspension
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XL'79-03
Tires & Wheels
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Arlen Ness Wheels
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Axles & Related Components
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OEM Wheels & repl Components
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Performance Machine Wheels
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Renegade Wheels
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Spoke Wheels
Tools & Supplies
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General Workshop Equipment
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Harley-Davidson Specific Tools
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Indian & Victory Tools
Transmission & Final Drive
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Final Drive
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Transmission - BT 4 spd era
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Transmission - BT 5 spd era
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Transmission - BT 6 spd era
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Transmission - XL 4 spd era
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Transmission - XL 5 spd era
Windshields & Luggage
Standard Pistons with 11.0:1 Compression Ratio. Fits Twin Cam 2007-2017 96ci or 103ci to 107ci Big Bore Conversion.
Regular price
$892.99
Sale price
$892.99
Regular price
Unit price
/per
Features & Benefits:-
* ID # 6932
* Bore = 3.937″
* Stroke = 4.375″
* Fully CNC machined
* Balanced to +/- 1 gram
* Double forced pin oilers
* Forged from high strength 2618 alloy
* Designed ...
Std Pistons with 10.25:1 Compression Ratio. Fits Big Twin 1999-2006 with 88ci to 98ci Big Bore Twin Cam Engine.
Regular price
$893.99
Sale price
$893.99
Regular price
Unit price
/per
Features & Benefits:-
* Bore = 3.937″
* Stroke = 4.000″
* Fully CNC machined
* Balanced to +/- 1 gram
* Double forced pin oilers
* Forged from high strength 2618 alloy
* Designed for maximum p...
Std Pistons with 10.0:1 Compression Ratio. Fits Big Twin 1999-2006 with 88ci to 98ci Big Bore Twin Cam Engine.
Regular price
$893.99
Sale price
$893.99
Regular price
Unit price
/per
Features & Benefits:-
* Bore = 3.937″
* Stroke = 4.000″
* Fully CNC machined
* Balanced to +/- 1 gram
* Double forced pin oilers
* Forged from high strength 2618 alloy
* Designed for maximum p...
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