Collection: Big Block GX Cylinder Head and Valvetrain Parts
This includes all of the top end parts of the Honda GX390 engines and its clones like the Predator 420, Duromax 440, Wildcat 460, and our 500cc Big GX.
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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 - 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 - Head Gasket - Fiber - 92mm
Regular price $12.95 USDRegular priceUnit price per -
Big Block GX and Clone Copper Head Gasket - 94/95mm
Regular price $24.95 USDRegular priceUnit price per -
Big Block GX and Clone JT-97 Large Port Cylinder Head
Regular price $64.00 USDRegular priceUnit price per -
Big Block GX and Clone Stock Replacement Head Gasket - Fits 94m Bore - Fiber with Fire Ring
Regular price $15.95 USDRegular priceUnit price per -
Big Block GX and Clone Stock Valvetrain Kit
Regular price $19.95 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 -
Big Block GX Clone Cam Lifter
Regular price $3.00 USDRegular priceUnit price per -
Big Block GX Clone Wedge Head Valve Cover
Regular price $6.95 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 GX390 and Clone - 65lb Dual Valve Spring Set
Regular price $15.95 USDRegular priceUnit price per -
Big Block GX390 and Clone - Keepers - GX390-Predator420-Duromax 440-Wildcat 460-GX500
Regular price $15.95 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 -
Duromax 500 / Rato R500-D / R500-V Rocker Arm Shaft Retainer Plate
Regular price $3.99 USDRegular priceUnit price per
