I have been trying to trace down low performance on my 2001 454 MPI MAG. I did a compression check today and they checked between a high of 120 PSI to a low of 80 PSI per cyllinder. I'm sure that I probably need at least a valve job. I'm planning to do a leakdown test on the low cyllinders tomorrow. What compression numbers have any of you seen on a bacically stock 454 Mag? Do any of you have any good head and cam reccomendations for a 454 MPI motor? It seems it may be time for some more power.