I bout my 2012 Cummins 6 months ago out of state with 51k miles on it appeared to be stock edge all that mess etc has a southbend clutch well looking around the engine bay today I noticed a oil leak around the rocker box so I ordered a gasket kit to replace as I was doing some more looking I noticed the truck has arp 625 head studs and all the bolts and such have wrench marks on them other then the oil leak should I be concerned about the reliability of the truck I plant to delete soon and run injectors and cp3 fass 175 and a mm3 with customer tunes I was gonna do head studs with the delete but I guess no need no just minding wondering if I should be worried no blow by or anything like that runs fantastic