Quote:
Originally Posted by uttergto
These are things I have done and checked. I am running a 180 deg. thermostat, the radiator has been re-corded and has been checked for flow. After driving on the freeway at about 3,000 RPM for 15 miles on an 80 deg day, the radiator inlet temperature is about 215, and the outlet temperature is about 205. As soon as I get on surface streets, the inlet temperature drops back to 185, and the outlet temperature is about 170. I am using 93 octane gas spiked with VP C12 (108 octane) with 6 deg initial advance in the distributor, factory specs.
1. Installed SS spacer plates in the front cover.
2. Changed three different water pumps with different impeller configurations.
3. Re-gapped the spacer plate to the water pump impeller from .187 to .080-in.
4. Purchased a new fan clutch.
5. Installed a temperature gauge in the radiator outlet hose to monitor cooling across the radiator.
6. Added a fan shroud.
7. Flushed the cooling system with muriatic acid.
8. Flushed the cooling system with plain water and bursts of compressed air.
9. Changed from an anti-freeze to a water-wetter solution.
10. Made an adapter to solid mount the original aluminum 7-blade fan.
11. Checked the thermostat in hot water for proper opening temperature.
12. Tried putting two different size orifices at the radiator inlet, 3/8 and 1/2-in.
13. Checked the intake manifold temperature sending unit for proper output.
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Needs a good tune , timing & fuel will correct most hot runs.