Collection:
Cylinder Heads & Parts - M8
7 productsShop the range of aftermarket motorcycle engine products at Pro Class Custom Parts.
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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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Cables & Hyd. Lines - Black
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Cables & Hyd. Lines - Chromite
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Exhaust System 2:1
- Breakout (2:1)
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Exhaust System 2:2
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Footpeg Mts, Adapters & Offsets
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Spare Parts - Foot Brake
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Spare Parts - Foot Shift
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Air Cleaner Kits & Components
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Carburettor Kits & Components
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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 Primary
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Gaskets Top End & Rocker
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Gaskets Transmission
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Hand Control Kits
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- 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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Pillion Pads
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Sissy Bar Side Straps
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Solo Seats
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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
0.565in. Lift Endurance Valve Spring Kit. Fits Milwaukee-Eight 2017up.
Regular price
$796.99
Sale price
$796.99
Regular price
Unit price
/per
FEULING ENDURANCE BEEHIVE valve springs are a direct bolt in replacement, no spring seat or rocker cover machining required. Endurance springs are machined from a premium grade Hi-tensile chrome s...
0.605in. Valve Spring Kit. Fits Milwaukee-Eight 2017up.
Regular price
$760.99
Sale price
$760.99
Regular price
Unit price
/per
Features & Benefits:-
* Works well with cams up to .605″ lift.
* High Performance conical single wire spring.
* Includes Springs.
* Includes Top Collars.
* Includes Keepers.
* Includes Botto...
ARP Head Bolt Kit. Fits Milwaukee-Eight 2017up.
Regular price
$814.99
Sale price
$814.99
Regular price
Unit price
/per
Features & Benefits:-
STAINLESS 12 POINT HEAD BOLTS UHL 3.215, QTY. 8
* Kit includes 8 head bolts, moly assembly lubricant and thread sealant
* The strongest studs & bolts available!
* Top...
0.625in. Valve Spring Kit. Fits Milwaukee-Eight 2017up.
Regular price
$573.99
Sale price
$573.99
Regular price
Unit price
/per
Features & Benefits
* Works well with cams up to .615″ lift
* High Performance conical single wire spring
* Kit Includes: Springs, Top Collars, Keepers, Bottom Collare/Seals
Tech Tips:-
* Roc...
ARP Hi-Performance Cylinder Stud Kit. Fits Milwaukee-Eight 2017up.
Regular price
$471.99
Sale price
$471.99
Regular price
Unit price
/per
* The strongest studs available!
* Top engine builders demand quality fasteners! Secure your engine with complete confidence
* Superior in strength and performance to any other cylinder stud kit o...
Head Bolt Kit. Fits Milwaukee-Eight 2017up.
Regular price
$429.99
Sale price
$429.99
Regular price
Unit price
/per
Features & Benefits:-
* Heat Treated 8640 Steel.
* 200,000 psi Ultimate Tensile Strength.
* 14% increases in strength over stock.
* Stronger material than stock Head bolts.
* Durable Black Oxi...
Hi-Performance Cylinder Stud Kit. Fits Milwaukee-Eight 2017up.
Regular price
$224.99
Sale price
$224.99
Regular price
Unit price
/per
Big bore, big compression and big throttle take their toll on hard parts and engine studs are no different. If your motor sees any of these we recommend stepping up to S&S Chrome Moly Head Stu...
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