[Bowtie]

like several have said in here, rollers do not rotate, thus you have constant wear in one single direction between the roller and cam. while a solid roller can give you outstanding lift and duration, the expense is lifespan...particularly if you are running an aggresive cam profile with subsequent high spring rate. if that is the case, i would almost recommend checking the valve lash every couple hundred miles to try and mitigate some of the lifter slap that can really take a toll on the hardened (thus brittle) cam lobe/lifter wheel. a hydro roller will let you slide on maintaining proper lash, but you still have uni-directional wear on both parts. for a street application, i highly recommend using a solid non-roller, and check lash periodically. the money you put into your motor can be much more efficiently spent on dynamite heads (which can help you make lots of HP on a non-roller pump gas engine). bottom line...in my opinion, the best place to spend the bulk of your motor budget is in the heads, and stick with a non-roller motor. nice big valves and well contoured ports will go a long way towards offsetting the loss of lift and duration. Bowtie