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Which thermo for a gen 5 502 mag mpi

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Old 03-25-2010, 05:36 PM
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Default Which thermo for a gen 5 502 mag mpi
Im in need of a new thermostat for my gen 5 502. There is a couple of options, a 140, or a 160 degree..
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Old 03-25-2010, 06:03 PM
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Closed or open cooling system? Water pump or bypass?
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Old 03-25-2010, 06:05 PM
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Originally Posted by stlliberator
Im in need of a new thermostat for my gen 5 502. There is a couple of options, a 140, or a 160 degree..
You need the 160 degree to keep your stock EFI engine from running to rich and fouling out the spark plugs.
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Old 03-25-2010, 08:52 PM
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All the Merc black EFI engines use a 160* TStat.
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Old 03-26-2010, 06:32 AM
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160 just removed mine last month. Make sure you get a new cork gasket up top too, they turn into a bock of rust, cant even tell there one in there!!
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