My 1965 Ford F100 truck backfires while driving. Is it because I'm putting regular gas rather then premium gas? I have a 390 V8 in it?

My 1965 Ford F100 truck backfires while driving. Is it because I'm putting regular gas rather then premium gas? I have a 390 V8 in it?

Rnaybe you should have a rnechanic look at your car

Check the ignition timing. Is it a true backfire (exploding up through the carburetor) or explosions in the exhaust? The former will often damage the carburetor. The latter could be a fuel mixture that's too rich or a missing cylinder that's putting raw fuel in the exhaust. If you have a Holley carburetor, replace the thing called a power valve inside the float bowl.

No, carburetor is running lean

If it backfires through the intake manifold the ignition timing is too far advanced or you have bad intake valves.
If it backfires out the exhaust the exhaust valves may be bad.
Gasoline isn't causing it.

Its because your truck is unreliable. 40 years ago most of those trucks rusted away or they were unreliable and most of them were crushed. That's why they are so rare and "collectible"

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