Gjac wrote:
You got 5 pages of good advice. I have two questions. The backfire that you hear is it through the carb or out the exhaust? How old and how thick are your spark plug wires? Have you tried to start it at night and look for arcing wires stealing spark before it gets to the plugs? Wires do go bad from the heat which the 454 produces a lot of. After replacing my ignition wires twice I went to the 10.5 mm Taylor wires that have lasted about 8 years now. I timed mine from the bottom using # 5 plug and removed the tan wire from the distributor. I went to 9 degrees before TDC it made a difference in performance. Also I think that your total advance should be about 23 degrees. There is an older thread by Sum1 that gives the details on how to check it.
That was 3 questions.
Sure seemed like exhaust
Champion high perf wires with heat shields around rubber connectors. 9 years. 10k miles. Not sure how thick.
No.
Timing proven to be off. Now best guess is +/- 43 deg btdc
Guess I should update the OP
