my father said back when for him a gasoline called white gasoline ...no lead and cars ran on that...low compression engine and real long stroke in inches compared to cylinder diameter in inches
longer the stroke the more torque when the diameter stays the same
little horsepower but a lot of low end torque
torque moves the car at in town speeds which is most peoples entire life and usage
horsepower costs a lot of money the more horses you buy the more it costs (YES think of it as an actual real live horse)
the slower the engine turns RPMS the better gas mileage and less pollution
slow rpms needs more torque not horsepower AND LESS HEAT PRODUCED...LIVE IN A HOT CLIMATE BACK THEN NO NEED FOR A THERMOSTAT ONLY NEED TO WARM THE INTERIOR OF CAR FOR PEOPLE ...COOLER ENGINE MORE GAS MILEAGE AND HORSEPOWER
IN GOD WE TRUST
<personal information redacted>
I'm sure your father is a good man, but you should probably ignore his car advice.
The no thermostat thing has been a myth for at least 60 years. The thermostat's job is to get the engine to the operating temperature where it runs most efficiently, ie, the metal has expanded to fulfill the clearances it was designed to run at most efficiently. Running without a thermostat is almost as bad as trying to clean the carbon out of your engine as pouring lacquer thinner in the gas tank. But some people still believe it.