What is the firing order for a Chevrolet 454 engine at distributor number 1 before or after power tach wires?
The firing order for a Chevrolet 454 big-block engine is 1-8-4-3-6-5-7-2. The location of the power tach wire on the distributor doesn't affect the firing order itself. The firing order is inherent to the engine's design and camshaft.