Originally Posted by tomw
One note about the roller cam followers. The valve stem diameter was decreased at some point, and the followers have narrower tips. You have to get followers that match your stem diameter. I've thought about just swapping the cam for a performance boost in my old truck. Less friction, and I think the grind is a bit more aggressive.
I knew this but forgot to mention it. The easy was to spot the correct ones is the later "narrow" rockers are made from stamped steel and the early "correct" rockers are cast or made using the powered metal process.