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Where is the number 1 contact on distributor of a 1993 chev 350 motor?

The #1 contact on the distributor of a 1993 Chevy 350 small-block engine is located on the rotor. It's the point on the rotor that's pointing towards the #1 spark plug wire tower when the engine is at its #1 cylinder's top dead center (TDC) on the compression stroke.

You won't find a physical "number 1" marking on the distributor itself. You have to use the engine's timing marks and the firing order to determine it. The firing order for a typical 350 small-block Chevy is 1-8-4-3-6-5-7-2. You'll need a timing light or a dial-back timing gauge to find the exact TDC and align it with the rotor pointing to the #1 spark plug wire terminal.