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What is the firing order for a 1981 ford F-150 351 modified and how are cylinders numbered?

The firing order for the 1981 Ford F-150 351 Modified engine is 1-3-7-2-6-5-4-8.

The cylinders are numbered as follows:

-Front of engine (timing cover): 1-3-5-7

-Rear of engine: 2-4-6-8

This is the standard Ford firing order for the 351 Modified engine.