Originally Posted by BH27G1B
Originally Posted by second 70
With it being both cars I'd guess gas. All gas even race gas can go bad.
Yes, the race gas is a few years old, but it's strange that a different ballast resistor will allow them to run... I'll put in fresh race fuel after removing the gas in them ....next spring. Plus, other cars I have still run fine on the same race gas...strange...maybe it's just a matter of time before it effects them also. I'll try fresh fuel, and new resistors.


These are old cars and sometimes it's because of what crud or chemicals that have accumulated in the tanks over the years and got broken down over time. The longer the fuel is in the tank the worse it gets. The cars will start and run fine on what gas was in the carb but when they get the stale gas from the tank the problems start. If it was the ballast they would run fine after you replaced them.