OVERHEATING
I dealt with a similar situation yesterday.
1970 Charger 383 4 barrel. 2 row Griffin radiator. Clutch fan. No shroud. 3.91 gears.
I've driven the car with 150 miles on the rebuild all around the local area and have not had a problem with getting too hot. Burnouts, full throttle runs, idling in traffic, cruising, etc.
A friend was driving it Yesterday on the freeway, 15 miles in, it pegged the gauge so we pulled into a gas station. It took a lot of time and water to cool it down. A short time later while idling in line at a car show, it shot up again.
I removed and tested the thermostat. It opened when before the water boiled so it wasn't stuck shut. I replaced it and the water pump but I don't know if that was the problem.
In theory, freeway speeds should provide more than adequate airflow through the radiator but if there is some internal blockage of coolant flow, a slipping fan belt or clutch, too little ignition timing or an excessively lean fuel/air mixture, it may overheat.
I'm still unsure of what caused mine to boil over.
By the way...I agree with Wayne....220 isn't ideal but it isn't what I'd call "overheating". To me, that definition should be reserved for a condition where the radiator is puking into the overflow tank or onto the ground. Straight water boils at 212 degrees and a pressurized system raises that up quite a bit.
I dealt with a similar situation yesterday.
1970 Charger 383 4 barrel. 2 row Griffin radiator. Clutch fan. No shroud. 3.91 gears.
I've driven the car with 150 miles on the rebuild all around the local area and have not had a problem with getting too hot. Burnouts, full throttle runs, idling in traffic, cruising, etc.
A friend was driving it Yesterday on the freeway, 15 miles in, it pegged the gauge so we pulled into a gas station. It took a lot of time and water to cool it down. A short time later while idling in line at a car show, it shot up again.
I removed and tested the thermostat. It opened when before the water boiled so it wasn't stuck shut. I replaced it and the water pump but I don't know if that was the problem.
In theory, freeway speeds should provide more than adequate airflow through the radiator but if there is some internal blockage of coolant flow, a slipping fan belt or clutch, too little ignition timing or an excessively lean fuel/air mixture, it may overheat.
I'm still unsure of what caused mine to boil over.
By the way...I agree with Wayne....220 isn't ideal but it isn't what I'd call "overheating". To me, that definition should be reserved for a condition where the radiator is puking into the overflow tank or onto the ground. Straight water boils at 212 degrees and a pressurized system raises that up quite a bit.
