Thread: Chevy 350 Engine Backfire

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Originally posted by macfarlb
Well, I checked the timing and that doesn't seem to be the problem, engine still backfires. With the vacuum advance disconnected, it is set at 10 degrees at 1,000 rpm, and at 2600 rpm the total timing is 30 degrees. At 2600 rpm with the advance connected, total timing is 52 degrees, which all fall within the reasonable range for the engine. I guess my next step is going to involve taking apart the motor...

1. Check to see if the carb floats are working properly and the butterfly

2. Check all of the ignition (Spark Plugs, Wires, cap, rotor, points)

3. The go after the timing again

4. You also have a really good chance that you have blown the power valve in the holly and if so you can buy a one way power valve from summit or jegs for around 12 dollars to fix the holly

5. Dont tear down the motor until you get to the final and last resort