Back in the game! Backfiring.

[renaissance man]

Originally Posted by Gaz64

Since it starts normally with starter fluid, you have proved engine mechanical and ignition system is fine.
Your carburetor or fuel quality is the cause.
What is the list number of your 650 Holley?
How long since the carb has had a rebuild?
How old is the fuel?
Gary

I believe you are correct about the mechanical and ignition system being good. Still might need a tune, but you’re right it’s probably good. The carburetor has never been rebuilt so that could definitely be an issue. I’m literally thinking of not going through with it and just replacing it with a weber induction system. The fuel could also be a problem. It had some fuel in it but I do not seem to have a drain for the gas tank? The gas could be as much as two years old maybe three. So I put some fuel stabilizer into it. And then topped it off with fresh fuel hoping to dilute anything else in there. My concern though was if I did drain the tank, what do you do with 10 or 15 gallons of gasoline?