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If the cooling capacity if adequate for both motors, you'll notice no difference-- you'll stay at the thermostats' specified level.

If you're radiator/fan setup is at its limits now, you'll find that it will be worse with the larger engine(assuming you're increasing the power output).

Give us more specifics on your old motor and cooling system (w/p, fans, and radiator) and we can be more specific.

Have a good day!
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