DED 18cc ''Big Valve'' Billet Race Head for Honda GX200 & Clone Engines
Big Valve - Small Block 18cc Billet Head by Dynamic Engine Development / DED Racing
- Premium Stainless Valves: 1.35" Intake and 1.1" Exhaust
- Fully CNC machined from a solid billet of aluminum
- Made in the USA
- 4 bolt flanges with silicone O-ring seals (no gaskets to worry about) superior seal
- Offset intake valve to de-shroud from cylinder wall (better flow)
- Offset Rocker Billet Roller Rockers (to accommodate the offset valve location)
- Shaft rockers are lighter than stud mounted and at least as rigid
- The correct intake to exhaust valve size, smaller exhaust valves allows us to move the intake valve away from the cylinder wall
- High velocity, correctly sized ports, peak power ~8750rpm with a flat long power curve
- Rockers made from 2024 material for its superior mechanical properties
- Rockers use full compliment needle bearing pivot for minimal friction
- Non Beryllium Copper Valve Seats (4x the heat conduction of steel seats to remove heat from valves) (same material as cup car engines)
- High Efficiency Combustion Chamber with 10mm spark plug to reduce distortion and seat warp caused by 14mm plugs
- Maximized cooling by use of many well-placed fins to aid in reliability and power
- High performance manganese bronze valve guides
- Competition Cams premium valves springs Included - Constructed from Pacaloy®
- DED Billet 7075 light weight high strength retainers
Includes:
- Billet Head
- Valves, Springs, and Retainers
- O-Ring Seals
- Head Bolts and Other Hardware
- 1.25:1 True Shaft Roller Rockers
- Intake and Exhaust Flanges
The new big valve version is designed for builds with 2.7" bores and bigger . It has both bigger valves and bigger (correctly sized) larger ports than the std SBH. It utilizes an efficient 18cc combustion chamber.
This head will help your big bore build reach its full potential! Optimized for bottom end pull and still able to hit high horsepower numbers on the larger displacement >236cc builds.
DED Racing has taken its 20 years of air cooled cylinder head development experience and integrated it into their new billet Honda/Clone head. Introducing the SBH designed to be an affordable upgrade of modified cast heads. With its integrated rocker arms, superior flow, and rigidity, it offers performance and value that can't be matched by a cast head or even other billet heads. It is designed to be a true bolt-on product where the critical items are included, so you don't have to search far and wide to get your project together. This also allows them to ensure that things like rocker arm geometry is optimized and perfect. (Simply, More Powerful- This is a product to make your sport more fun, not more frustrating).
- Billet Flywheel Required
- 1/4" Chromoly Pushrod Required
- Billet Connecting Rod Required
- High Performance Piston Highly Recommended
- Run with at least 16 OZ of 4T Briggs and Stratton/Amsoil Oil
- .315 or less lift Cam Shaft with the 1.25" rockers this lift is optimal.- Bigger Cams waste torque and reduce the overall power output of the head.
- 28-32mm Carburetor, or HL 380 series Tillotson style carb - Intake ID is 1.125"
- Methanol Fuel is highly recommended for its cooling and power effect.
- Race Gas/Premium Mix 50/50% but, a 206 could probably run on 93 oct OK for drag racing applications where less heat is present.
- Timing 28-31 on Gas or 31-34 on Methanol
Requires the use of a SFI approve Billet Flywheel! Never use anything but an SFI billet flywheel with our engine products. This head is designed for sanction racing events only and must be installed by a qualified technician with knowledge of the sport you compete in.
