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Old 03-09-2015, 07:14 PM   #2
Brentwood Bob
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Join Date: May 2010
Location: brentwood, ca
Posts: 4,420
Default Re: Boyce Motometer Question

I have the one on the right. it does not rotate, or flip open. It goes on like a regular radiator cap.
A clue is that from the radiator side you can see where it twists into the neck of the radiator on a 30-31.
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