Is there a alternate firing order for 1991 f150 with 302?
No, there isn't an alternate firing order for a 1991 Ford F-150 with a 302 cubic inch (5.0L) engine. The firing order is always 1-5-4-2-6-3-7-8. This is a fixed design characteristic of the engine. Any deviation would require significant internal modifications (e.g., changing the camshaft, distributor, or wiring).