Just because the parts are new doesnt mean that there couldnt be rust in the rocker shaft. coolant left over from teh grind process could be the culprate (rusting the inside of the shaft) Good place to look none the less.

'01 P1500, Blown/Inj BAE,/Veney ,Bruno/CS2,Dana 60
'01 Dodge 3500 S Cummins Auto, Fresh air kit, 4" Exhaust,
'05 Dodge Magnum R/T - Too Much to list
'60 Willys CJ5
'01 International LPX - Project,DT466, Allison
'64 Plymouth Valiant, Inj 528 Hemi, 2spd