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Old 09-22-2011, 11:28 AM
Jorski Jorski is online now
MC Devotee
Join Date: Jul 2004
Boat: 1993 190 with LT1
Location: Toronto, Canada
Posts: 1,469
Normal operating temp for the LT1 is 160 degrees. (same as the temp rating as the top t-stat)

If you are normally running 20 degrees warmer than your have a cooling system problem.

Check, raw water pump flow, look for leaks from the circulation pump, and make sure that you have the correct t-stats and that they are installed correctly and are operating for blockages in the cooling passages.

Note the top t-stat needs to be a 160 degree one, with a by-pass hole drilled in it. Make sure to get the mastercraft one...there are many automotive ones that won't work.

Last edited by Jorski; 09-22-2011 at 03:47 PM.
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