I don’t know why they use the 313065 restrictor gasket on the T Stat models but I would think the water tube alone would be more restrictive than the hole in the gasket. BRP might have realized this as some six horse 313065 gaskets I bought from the dealer didn’t have the small hole and were identical to the ’56 – ’58 304314 gaskets. I guess it’s possible they could have been packaged wrong to but switching them around doesn’t seem to affect the operating temperature or water flow in the motors. The motors can’t tell the difference.
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