If you're gonna buy an rx-7, buy one with a rotary engine. Thats what it came with, so thats what should be in it. If you do buy an rx-7, and the engine is in goood shape but then goes bad, ( IT'S YOUR FAULT ). If you get lazy and don't want to fix it and even think about throwing a piston engine in it, just sell it. Someone else who really wants it will buy it and fix it. Nobody wants to see another ruined rx-7. Anything is unreliable if mistreated.