I'd go with the 140 for salt and a 160 for fresh. Anything higher is too
close to overheating in a low pressure cooling system. If it's a closed
system, that's different. You can run a 190 no problem in a closed system.

"OSU" wrote in message
ervers.com...
whats the correct operating temp for a 98 Merc 5.7 V8 RWC Carb pushing an
alpha drive, and whats the correct T-Stat for this engine

Thanks