66 327 overheating
Hey guys, my 66 327 Malibu has an ongoing heat issue. I live in Queensland, Australia, the temps at this time are around 25 Celcius (74F). Car gets hot after 20 minutes or so of driving. Temp gauge creeps to 90+ Celcius (194F), which I know isn't too high, however at this temperate it is also causing a vapor lock issue and the car begins to hesitate and eventually stall.
This sounds like an airflow issue to me, the car is so hot under the hood. Car mainly gets hot in traffic, if I can keep it running on the highway the temp seems to sit steady around 80-85 Celcius, and no vapour lock. If I park the car and turn it off, the temp gauge keeps rising, highest I've seen is 110 Celcius. I have to turn the thermo fans on while the car is off to cool it down.
Current setup is:
327 with cam, headers, intake, carb, dizzy
Current timing is 18 initial, 38 total timing. Tuned 4 weeks ago, carby and dizzy all tuned
Aftermarket (eBay) triple core rad with 10" fans, thermatic controller kicks them in at 66 Celcius, I have tried various temparatures with no change.
160F Thermostat that it brand new, tried 185F and no change.
New long high flow water pump, runnig V belt setup
New temp gauge and sensor
I have checked the following.
Thermostat is working, I got the car up to temp with the rad cap off, hot coolant came into the rad spot on 160F.
Water pump flow is also good, checked and once the thermostat is open its flowing really well.
Fans are pulling and blow air the correct direction.
Water pump pulley is 6 1/4", which should be ok.
I am thinking of trying the following:
Remount the trans cooler with a gap between it and the radiator, or move it somewhere else altogether
Replace the dual 10" fans with Spal fans.
Wrap the headers (this will be a pain and don't really want to do it).
Replace with new radiator\shroud.
Any other suggestions? I believe in the 66 the air is supposed to travel down through the same place as the exhaust does, are the headers causing everything under the hood to get to hot, and as the fans blow back into the engine and headers, is the heat getting trapped under the hood with no where to go? Is the radiator size sufficient? Fan size ok? I don't want to run a clutch fan as I prefer the aesthetic of the thermo's, so that might be a last resort.