Hubert
Active Member
I have purchased a 1974 Roadrunner about 2 years ago. It was an original automatic and had been switched to a 4 speed. An agressive cam had been installed as well as a dual double pumper carburetor. It has a 318 engine. When i got the car it had 323 rear end gears and was extremely sluggish when taking off in 1st gear, sometimes even stalling out. Moving today, i had 373 gears installed and was still a little sluggish. Future investigation it was thought the carb was way to big for the engine, so i installed a new holly 650. All issues resolved. Problem now is at 45 mph in 4th gear the engine is running at about 3100 rpm. Sounds like it going to come out from under the hood. Any suggestions to lowering the rpm. Should i go back to 323 or even mayby 273?