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Old 02-12-2018, 11:26 AM   #3
700rpm
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Join Date: May 2010
Location: Portland, Oregon
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Default Re: Why no lock-washers?

I have always thought that it isn’t that they work loose, it’s that the high temps on the manifold cause the metals to expand and contract which changes their relative fitment. On the head I have assumed it was the head gasket getting settled in. No science here, just my assumptions.
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