FX K3DC

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Hudy family present new engine.
As like as OS,it has square bore,3 port.
And crank shaft is coated with DLC.

Why is FX engine's block color silver.

Other brands is black.
Is there difference on production?
I think big 3 heatsｉnk is more thin and sharp.

Engine block strength is important for stable rotation.
But surface area should be more vast. 
And cooling should effects more on exhaust area.

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