To find cylinder #1, you'll need to:
1. Consult a repair manual: A factory service manual or a reputable aftermarket repair manual specific to a 1994 Ford F-150 with a 302 engine will show you the firing order and a diagram of the engine with the spark plug locations clearly labeled. This is the most reliable method.
2. Find the firing order: The firing order for a 302 (5.0L) Windsor engine is typically 1-5-4-2-6-3-7-8. However, double-check this in your repair manual as there might be variations depending on the specific year and configuration.
3. Identify the crankshaft pulley: Find the crankshaft pulley on the front of the engine. The crankshaft rotates clockwise.
4. Trace the firing order: Starting from the crankshaft, follow the firing order to identify cylinder #1. The physical location will then be apparent. Cylinder 1 is usually at the front passenger side (right side, in US vehicles).
Without a repair manual, precisely locating #1 spark plug is difficult and unreliable. Using an incorrect firing order when working on your ignition system can cause serious engine damage. Always consult a repair manual before attempting any engine work.