I’ve had that happen when I was an auto mechanic. Car comes in with symptoms of leaking valves/seals/guides. “We can put a new head on it, but now that the top

I’ve had that happen when I was an auto mechanic. Car comes in with symptoms of leaking valves/seals/guides. “We can put a new head on it, but now that the top end is nice and tight, it very well might blow the old, weak-ass piston rings. Recommend a rebuilt.” Put a new head on it, sho’ enough, car comes back two weeks later blowing smoke from the rings. The $300 part fixes your problem today, the rebuilt engine fixes the reliability problem you might still have after the $300 quick-fix.