It depends on if it was done right honestly. I'm weary of buying a LS/Vtec if I don't know who did the work, but if it was done by a reputable shop or tuner, they're pretty solid. Depending on what was done to the bottom end you just may not be able to push the rpms as much as you would like, to keep it reliable. My tuner told me if you go LS/V with a stock bottom end, to set the limiter at 7200 and it'll last forever.