Originally Posted by
luvdatbobcat
IIRC, the 351w and HO 302 have a different firing order as to balance the load on the main bearings.
Actually the 351 and late model 302's which includes the Mustang 5.0 and '94+ truck motors use the same firing order(13726548), it was the earlier 5.0's that had a different firing order(15426378).