Firing order for most (all?) 60 degree V6 engines, and possibly 90 degree V6 engines with split big end journals. Firing order for these engines is an easy to remember 1 2 3 4 5 6.
This numbering system applies to Nissan, Toyota, some GM engines and others. other numbering conventions are used but anything with crank journals in the same places fires in the same order if you ignore the numbers.
