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Hop Up Kit, 440 Duromax

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Product Code: -STAGE4KIT440

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Stage 4 Hop Up Kit for 440cc Duromax 92mm Engines
This kit is similar to our Stage 3 kit for 13/15HP engines, but is tailored to a 92mm bore and adds a ported and milled head with stainless valves, ARP heavy duty stud kit, and heavy duty valve train components. Allows up to 35+ HP out of a 440 Duromax engine.

Kit Includes:

Fully Ported and Milled Race Head (High-RPM Genuine Honda Large Port Core)
High-Flow 40mm / 32mm Valves with Lash Caps
Dual Springs with Titanium Retainers
307 Race Cam
Black Venom Aluminum Roller Rockers
Valve Cover Spacer
Chrome Moly Pushrods
Choice of Carbs (Or use your own)
92mm Forged Flat-Top Piston with Rings
Billet Rod (+.040")
Offset Timing Key
Carb, Insulator, Head, and Case Gaskets
ARP Bolt Kit
Choice of Flywheel (Or use your own)

*Note: This kit only fits 440cc non-hemi Duromax engines. Filter should be sprayed with K&N type oil, especially in dirt applications. Oil not included - click here. Billet aluminum flywheel REQUIRED. These kits are intended for experienced engine builders. Some clearancing, fitment, or other engine building "tricks" may be needed. Picture for reference only. See above description for actual content.

Due to the head work required for this kit, please allow 1 week to ship.