Im interested in putting a roller cam in my 302 that is pre-roller, and thought I had a set of retrofit lifters picked out, but as I was reading the "400hp 351" thread, I posted a link to some retrofit roller lifters I thought would work and was told they wont. After some searching on Summits site, Im more confused than ever. Theres literally hundreds of different kinds of roller lifters, many of which say they can be used in non-roller blocks. Im not ready to step up to solid rollers (yet), dont want to limit myself to reduced base circle cams, and dont want a cam/lifter combo, so that narrows things down quite a bit, but there still is an awful lot of different lifters that claim they work. My question to those who have done this is: what are my options for a set of retrofit rollers? Prices seem to range from $220 for the ones I thought would work, to well over $600. My short block is fresh, so no reason to just build a new engine.