Originally Posted by GIJoeCam

Ditto. You can but there's no way in the world I would let them do that. If the mechanic's shoddy workmanship broke the motor, he should be making every attempt to repair or replace it at no charge to you. I would not, under ANY circumstances, allow hit to replace the 5.4 with a 4.6. IIRC, you'd be giving up about 1/3 of the power you had with the 5.4.

-Joe