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On which side is the no 1 piston on a 400 V8 and what firing order?

The #1 piston location and firing order for a 400 small-block Chevrolet V8 are:

* #1 Piston Location: The #1 piston is located on the passenger side (right side), front of the engine.

* Firing Order: The standard firing order is 1-8-4-3-6-5-7-2. There are some slight variations depending on the exact year and possibly the manufacturer of the engine, but this is the most common. Always double-check your specific engine's casting number or service manual for absolute certainty.