Thermostat Gasket?

I used a cheap thermostat and gasket and it didn't fit properly and it leaked. Just use the factory MerCruiser gasket with the brass inserts for temp. Just don't use cheap knock off shit unless you like doing things twice, learned my lesson

I take my thermostat out every year to winterize on both my boats with IO's and make replacement gaskets out of regular gasket paper and never had one leak.
 
The NAPA gasket definitely isn't a "cheap knockoff", but I am waiting for the Mercruiser one. It'll be here Tuesday.
 
I didn't mean it that way. If I can afford MerCruiser parts and some are expensive like driveshaft and u joints, I will pay for the factory. They designed it engineered it for a reason so I will spend the money on factory parts. Oil filter and fuel separator I've been fine with Sierra parts for some things
 

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