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1941 Buick super coupe bypass thermostat body


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Hi Guys

Working on my thermostat and spring loaded valve body.

I bolted it in and have coolant pouring out of the top one of the bolt head.

looking inside the body I see a hole that the bolt passes by that the coolant is leaking from .

What is that hole for and should it be Welsh plugged ........


any pictures or guidance would be great cause I cant find anything in the manuals.





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