They aren't extremely oval but they are oval. The axis with the bubbler is longer than the axis 90 degrees off from it. They did it that was as yet another clue (on top of the notch in the pump casting flange for the bubbler) that the thermostat is orientation specific. That's why when you put it in right it fits so nice and snugg and stays in by itself etc and when you put it in wrong you aught to notice you did it wrong.
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Originally Posted by Trevor
Strange as my JDM OEM thermostat could not be described as oval. The mounting/sealing flange is circular.
The after market replacement I purchased, was of slightly different size and detailed construction, but was otherwise exact in all operative respects including the bubbler.
Previously I have relied on the the same test and know what is involved, but as a result of this last experience, now have my doubts. The valve did open, but I was not sure if it was erratic.
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