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Old 01-02-2011, 06:39 AM
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Some things that will make it run hotter than you'd like:

Not enough fan air flow thru the rad.

Not enough airflow thru the rad at hiway speeds.
Not enough idle spark timing.

Defective vacuum advance.
Are the heater hoses hooked up?
Add some Water Wetter to the coolant.
Collapsing lower rad hose. (missing hose spring)
Air trapped in the coolant system.
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