The EC Evolution Performance Cast Cylinder Head isn't just changing the game; it's rewriting the rules.
The EC Evo Head is a Big Valve Non-Hemi Head with 33mm Intake and 27mm Exhaust with 5mm Stems for the Honda GX200 and many clones, including the Predator 212, Tillotson 196-212-225, Wildcat 223, and Ducar Engines.
When EC designed the Tillotson Blocks, the goal was to increase the performance and durability of modified engines while lowering the build cost. The EC 236cc engine kit was a manifestation of that goal, but it still lacked one area that was still relatively expensive. For racers to compete in 14.5ci open engine kart classes, billet heads were considered the best offered, whether it was stock or modified.
The Evo was to answer the cost of those cylinder heads, but it wasn't the only goal. The Evo allows you to use the same intake manifold, exhaust header, rocker arms, valve cover, valve springs, and retainers currently on the market for Honda, Predator, Tillotson, or Clone Non-Hemi Heads. So not only are you not replacing those parts, but you now have more options for those components. Most billet heads offer only one ratio, which may limit your cam or spring choices.
There are also situations "Billet" heads are not permitted, and within minibike drag racing, there are "cast only" racing and records. These classes will often allow extensive modifications to those heads rather than allow billets. As we said, the EVO is here to rewrite the rules and change the game. The EVO is a cast head that rivals the performance of a billet head.
Here is a flow chart provide by Barry Young at Young Engines.
Lift CFM @ 28-Inches - Intake Valve
EC has put horsepower on tap, and it's affordable. Lowering the cost also opens cylinder head builders and engine builders to a better platform for modifications and new combinations. We look forward to your combination tag us with your Evolution Head @ #ECevolution #ECcarburetors
Intake Valve - 33mm
Exhaust Valve - 27mm
Valve Stem Dia - 5mm
Combustion Chamber 20cc
Compression Ratio Examples(Final Result will vary on Engine Measurements):
Predator Hemi, Flat Top, .035" Deck height,
w/.045" Thick Head Gasket 8.64:1
w/.010" Thin Head Gasket 9.72:1
Tillotson 212R, Flat Top, .000" Deck height,
w/.045" Thick Head Gasket 9.72:1
w/.010" Thin Head Gasket 11:14:1
Wildcat 223 w/Billet/Forged Rod, Flat Top Piston, .000" Deck height,
w/.045" Thick Head Gasket 10.16:1
w/.010" Thin Head Gasket 11:66:1
Tillotson 225, Flat Top, .000" Deck height,
w/.045" Thick Head Gasket 10.08:1
w/.032" EC Copper Head Gasket 10.6:1
EC 228R, Flat Top, .000" Deck height,
w/.045" Thick Head Gasket 10.21:1
w/.032" EC Copper Head Gasket 10.74:1
EC 236R, Flat Top, .000" Deck height,
w/.045" Thick Head Gasket 10.54:1
w/.032" EC Copper Head Gasket 11.09:1
264.5cc (3" x 58mm), Flat Top, .000" Deck height,
w/.045" Thick Head Gasket 11.42:1
w/.032" EC Copper Head Gasket 12.08:1