I have 171,000 miles on my 91 civic hatch my car smokes sometimes/burns oil which I continually add. I'm sure by the next time state required emissions test it most likely won't pass cuz of this. Some people told me I might be able to do just rings or valves/top half not entire engine rebuild or replace. Is there any major know problems with doing this instead of total rebuild if I am looking to save some money here? rest of engine may be in ok with exception of rings/valves is this even possible? thanks in advance for any advise.