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Parts Wanted Water cooled head for Thunder Tiger .21

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Is this the engine your talking about ?
Not exactly. The case is a .21 Pro. It’s set up as an inboard, but I don’t know if it was originally an OB, it’s been highly modified. Here is what the head looks like, it might be the same bolt pattern?
 

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Looks right as much as I can tell.

Do you know if the head button sits recessed inside of it, or is it exposed between the water jacket and the motor case?
 
It's between the case and cooling ring.
 

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Well here are a couple measurements for you. Let me know.
 

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