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You can usually start out about 8 degrees BTDC with no pinging. Increase 1 or 2 degrees at a time during normal operation until you hear pinging and then back off 2 degrees. On a dragstrip, increase timing 1 or 2 degrees at a time until best mph is observed.

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Q: What is the ignition timing for a Chevy 350 c.i. engine. The engine is of an unknown year. It has a carburetor and is emissions exempt?
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