Performance CNC Ported Cylinder Heads – Fits 25HP–40HP Mud Motor Engines | Mud Motor Central

Unleash the full potential of your mud motor with Performance CNC Ported Cylinder Heads from Mud Motor Central. Precision CNC ported for 25HP, 35HP, 36HP, 37HP, and 40HP Briggs & Stratton Vanguard Big Block mud-motor engines used from 2002 to present, carbureted or EFI — designed for serious builders and performance enthusiasts. Confirm your engine before ordering.

Each head is CNC ported to optimize airflow and fuel delivery, milled to .050 for raised compression, and equipped with stainless steel valves and replaced valve seats. The result is stronger combustion, increased horsepower, and improved throttle response — giving you more pulling power in tough mud motor conditions.

✅ Features & Benefits

• CNC ported for maximum airflow and horsepower gains
• Milled to .050 for increased compression and stronger combustion
• Stainless steel valves and new valve seats installed
• Fits all Vanguard Big Block mud-motor engines used from 2002 to present: 25HP, 35HP, 36HP, 37HP, and 40HP, carbureted or EFI
• Built for durability under extreme mud motor conditions
• Custom milling options available for advanced builders

Compatibility Guide: Engine, Fuel System & Companion Parts

Fitment confirmed by Mud Motor Central: These heads fit all Briggs & Stratton Vanguard Big Block engines used in mud-motor applications from 2002 to present, including 25HP, 35HP, 36HP, 37HP, and 40HP models. Both carbureted and electronic fuel injection (EFI) engines are supported.

All mud-motor brands supported: Fits GatorTail, Mud Buddy, Go-Devil, Pro-Drive, Copperhead, Mud Walker, Mud-Skipper, and any other brand using a Briggs & Stratton Vanguard Big Block engine within the range above. Compatibility is based on the engine powering the motor, not the mud-motor brand. This does not cover those brands' motors powered by other engine families.

Gasket compatibility: These heads are compatible with all head-gasket thicknesses for the supported engines. Confirm gasket selection and build clearances with your installer; compatibility does not specify which thickness to select for your build.

Companion Parts & Tuning

Mud Motor Central confirms that installing these heads on the compatible engines above requires no additional companion parts or tuning, for either carbureted or EFI setups.

Buyer Checklist: Confirm Your Engine Before Ordering

• Confirm your engine is a Briggs & Stratton Vanguard Big Block used from 2002 to present.
• Check the engine identification label for model, type, code, and serial number if present.
• Note your mud-motor brand, model, year, and whether the engine is carbureted or EFI.
• Tell us about any existing engine modifications or previous head work.
• If you are unsure, send us your engine label photo and build details so we can confirm fit and answer questions about the milling specification before you order.

Unsure about fit? Message us with your engine label photo before ordering.

Installation Planning

Installation torque values supplied by Mud Motor Central:

• Rocker arms: 130 in-lb (inch-pounds).
• Head bolts: 350 in-lb (inch-pounds).

These values are in inch-pounds, not foot-pounds. Have your installer confirm the applicable service procedure, fastener instructions, tightening sequence, gasket selection, clearances, and valve adjustment for your engine and head configuration before assembly. This checklist is not a complete installation procedure.

Custom milling available: Contact us to discuss specifications and pricing tailored to your exact build.

📦 Fast Shipping — Custom Options Available

At Mud Motor Central, we keep performance heads in stock and ready to ship. Need a custom cut? Our machining team can tailor the milling to your exact build requirements. Get the right setup — whether you're racing, hauling, or pushing your mud motor to peak performance.