Collection: Big Block GX390 and Clones
These parts fit the 7-bolt and 10-bolt big block GX390 and it's clone platforms including Predator 420, Duromax 440, Wildcat 460, and our GX500.
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Big Block GX Intake and Exhaust Parts
This section showcases the intake and exhaust parts we sell for the...
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Big Block GX Cylinder Head and Valvetrain Parts
This includes all of the top end parts of the Honda GX390...
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Big Block GX Internal Engine Parts
This includes everything inside the crankcase of the Honda GX390 engines and...
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Big Block GX Flywheels, Coils, Shrouds, and Recoils
This section contains our flywheels, coils, shrouds, recoils, and other parts of...
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Big Block GX Bundles and Kits
This section includes parts kits for building and upgrading the Honda GX390...
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Big Block GX - Head Gasket - Fiber - 92mm
Regular price $12.95 USDRegular priceUnit price per -
Big Block GX - Head Gasket - Fiber - 88mm
Regular price $12.95 USDRegular priceUnit price per -
Big Block GX - Head Gasket - Fiber - 90mm
Regular price $12.95 USDRegular priceUnit price per -
Big Block GX - Side Cover - 7 Bolt
Regular price $39.95 USDRegular priceUnit price per -
Big Block GX Gasket Kit - For 10 Bolt Side Covers - 92mm Bore
Regular price $9.95 USDRegular priceUnit price per -
High Flow Air Filter Element for 55mm Carburetor Opening
Regular price $17.95 USDRegular priceUnit price per -
Big Block GX390 - Keepers - For 6.5mm Aftermarket Type Valves With Titanium Retainers
Regular price $31.95 USDRegular priceUnit price per -
Big Block GX and Clone Crankshaft - 66mm Stroke
Regular price $94.95 USDRegular priceUnit price per -
Big Block GX and Clone Crankshaft - 64mm Stroke
Regular price $94.95 USDRegular priceUnit price per -
Big Block GX390 and Clone - Titanium Dual Spring Retainer Set - GX390-Predator 420-Duromax 440-Wildcat 460-GX500-ZS GB620 - Pair
Regular price $35.95 USDRegular priceUnit price per -
Big Block GX and Duromax 500 - 6.5mm Valve Lash Caps - Pair
Regular price $9.95 USDRegular priceUnit price per -
Big Block GX Clone - R500-D - Stock Replacement Spring Set
Regular price $14.95 USDRegular priceUnit price per -
Duromax 500 / Rato R500-D / R500-V Rocker Arm Shaft Retainer Plate
Regular price $3.99 USDRegular priceUnit price per -
Duromax 500 / Rato R500-V Rocker Arm Shaft
Regular price $6.95 USDRegular priceUnit price per -
Big Block GX390 ARC Billet Side Cover for 7 Bolt Blocks - 6059
Regular price $219.95 USDRegular priceUnit price per -
Fuel Filler Cap for Duromax 440 and 500
Regular price $29.95 USDRegular priceUnit price per
