[undy]

Solid rollers are no good for the street, perio. The lifters will fail (needle bearings) with any significant "street" useage. Hydraulic rollers are the way to go, near solid roller performance at "streetable" RPMs. The best thing too, the cam lobes don't go away prematurely as with hydraulic/solid flat tappets. Even with a good break-in there's been many reports of later on cam failures. Today's oils, in general, aren't designed for flat tappet cams. I still don't have a warm fuzzy that the additives are a cure-all either.