What type of Electric Fan?

[RICK LAKE]

67JET Running an all aluminum motor was a pain in the beginning with running hot and overheating at the track. Every trick I know has helped in getting the temp lower and steadier when racing. Here is the list
The small twin fans are cool but do little to help air flow into the radiator
These things are dead spots and upset flow. The radiator in an era is on a 20 degree recline. The splitter in the nose works better.
Radiator, brass is nice for looks and is correct in styling but is like a heat sink under the hood and maintains heat longer than an aluminum one. The top of the line ones are what you want like a Griffen or Howell.
Largest fan with a shroud that will mount to the radiator. Seal the outside edges with foam tape to force all the air through the fan setup. Make sure your charging system is up to the load the coolant fan will draw. Make sure the wiring is also up to the load. #10 or #12 gauge, would not go any higher,IMO.
Small thing list, If the intake is off the car make sure that the coolant ports are cleaned out and gasket match the heads. My intake had alot of flashing from the pour when made was was not cleaned out on final machining.
Thermostats. For my style of driving and high speed driving this is also an important thing with having enough flow to and from the motor. I have modified an dodge 180 thermostats to fit my FE intake manifold. The outlet is 3/8" larger diameter for flow of coolant. I have tryed all the high flow, top of the line thermostats on the market. This works the best.
Last wisdom thought, I started out using junkyard or recycling parts, they failed at the wrost times. Buy new and read the specs for that parts and follow how to install and used. Make sure you have a heavyduty relay for your fan. You want a 30/40A one with heavy wires coming in and going out. It said this on the cover of the relay. 20/30A are for headlights and other smaller draw parts. The spike load is what kills relays, fan may only need 15-20 amps but to turn it on it needs 35-45 amps. Find a Fan with a min of 2,500 cfm. Rick L.