Thermostat O-Ring

I change my thermostat o-ring gasket that I bought from auto zone for $6.00.

When I change my thermostat before about 4 months ago with 180* I reused the factory o-ring so it start leaking. The one I change today was round and the factory one was flat on the bottom side of the ring, So does it matter ?
I put some gasket maker to seal the upper thermostat houseing and so far no leeks yayyyyy. Do I have to get flat factory o-ring ?

Some where I read that thermostat have sing saying face radiator side but on my jet 180* thermostat didn't have any marking what should I do ?

One more thing I notice that my hole engine bay smells gas so I am thinking i do have exhaust leaks. what you guys think maby I am loosing power with leak exhaust?

Thanks in adavance

DTNODYA said:

OK, with regards to the thermostat ... I know what you are talking about with the round/flat gaskets. They are both just fine and you don't need gasket maker. My factory gasket was round and the aftermarket thermostat was flat (opposite of your situation) and they both work fine.

As for the engine bay smelling like gas, I'd check and make sure that your fuel injectors are all the way down ... Could have an exhaust leak but you can usually hear an exhaust leak. Kinda sounds raspy.

Hope that helps some.

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Thanks for your response cause I was worried . Now I can sleep
On the another mustang website one guy told me I have to get factory o ring

metal of course. I don't have any leak no more so I think it's fine


http://www.mustangtuning.com/maximum-motorsports-full-length-subframe-connectors.html

I just bought it this morning