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Does anybody know the specs (length, thread, width) on the thermostat housing bolts on a 302 engine?

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They're 5/16"-18 X 3/4" (Coarse Thread). The thermostat housing will determine the bolt length. This measurement was for use with the OE aluminum housing. You may find it difficult to use a wrench on the lower bolt, if using a standard hex head type. I went with a "Button Head" stainless bolt. This takes an Allen wrench, which I found easier to use.
 
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