Machinist will not build engine unless roller cam is used!

Not just comps, do the words "hemi tick" mean anything to you ?
Don't forget all of the 5.3 LS nightmares. I have a friend who is a lead tech at a Chevy dealership and although the numbers are down, used to be ALL he did was warranty engine swaps from bad lifters and cams. .....and there's no other way on those trucks than to REMOVE the cab from the frame to do an engine swap. Ridiculous.