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Anyone able to find an equivalent car gasket that works to replace the 2 bolt and 3 bolt gasket that go together on the thermostat housing? I found the gaskets online but all of them are in the US and shipping will be way more than the gasket itself. Not sure if this is a marine specific or theres a car version that works. I know you can use a 160 degree car thermostat not sure about the gasket. Anyone had any luck?
The 2 bolt gasket is a standard 5.7L GM 1996-1999 truck thermostat gasket.
The 3 bolt is Indmar specific to the custom thermostat housing. You could get gasket maker material from the parts store and use the housing as a template to make your own.
As @HoldMyBeer said, I've known people that made them for both cars and boats.
Clean the area good before you reinstall so once you install it seals up properly > good to go.