Thermostat gasket leaking AGAIN!!!!

What size socket to take them out? 1/2"= 5/16 thread....9/16 socket=3/8 thread.
Not to be a dick, but you're working on a 50-60 year old car, get a plastic bolt gauge, they're like $5, if that. If they're open holes to the coolant, make sure to seal them with Permatex hi-temp thread sealant.
jfive said
Ok I have the same problem. Gasket failed at the film again, that stuff turns to jelly apparently on contact with coolant.

Got the aviation sealer and new FELPRO gasket. Way different than the last 2. I guess they didn’t listen the other times I asked for Felpro. I got everything cleaned up and have another question.


What size are the bolts?
I want to get new ones as these just look nasty and missing some threads.
Here’s a few pictures of what I had.

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