However, there's a crucial caveat: The distributor cap itself doesn't inherently have markings that directly correspond to cylinder numbers. The number 1 position is determined by the engine's firing order and the distributor's rotation.
To find number 1:
1. Find Top Dead Center (TDC) for #1 cylinder: With the engine at TDC on the compression stroke for cylinder #1 (you'll need a timing light or a method to ensure this), the rotor button should point to the number 1 spark plug wire terminal on the cap. This is the ONLY reliable way to determine #1.
2. Firing Order: The firing order for a typical small-block Chevy 350 is 1-8-4-3-6-5-7-2. This tells you the sequence in which the cylinders fire. Starting at the #1 position you found in step 1, follow the firing order clockwise around the distributor cap to connect the remaining wires.
3. Distributor Rotation: The distributor rotor rotates clockwise as viewed from the top (when looking down at the engine).
Without properly finding TDC for cylinder #1, any other method of determining #1's location on the cap is unreliable and could result in a misfire or engine damage. Use a service manual specific to your 1994 G20 with the 350 engine for detailed instructions on finding TDC.
