Stage 4 Hop Up Kit for 440cc Duromax 92mm Engines in Mud Motor & Marine Applications

Stage 4 Hop Up Kit for 440cc Duromax 92mm Mud Motors
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. This kit includes our 306-0807 cam and large port Honda head for more torque, and overall better performance in mud motors & marine applications compared to our original stage 4 kit.

Kit Includes:

Fully Ported and Milled Race Head (Genuine Honda Large Port Core)
High-Flow 40mm / 32mm Valves with Lash Caps
Dual Springs with Titanium Retainers
306 Series Race Cam (RPM Grind)
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)
Option to add a Mud Motor Exhaust System

*Note: This kit only fits 440cc non-hemi Duromax engines. Filter should be sprayed with K&N type oil. 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.