[Greenhornet2]

First check your local laws. Most states have a "lemon law" no matter how it is sold if you pay a certain amount there is a state like warranty the seller must honor. CT its 30days for purchases under something like 3-6k 60 days above 6k (just guesses don't know the actual numbers. If you can do the work I would rebuild it. Even if you can't if it's a car you love you may want to rebuild it. May not need an engine might just need pistons and valves or a head. Definitely need more info. A lot of mechanics will just say replace the engine, when it can be rebuilt. A used engine is cheaper, rebuilding is middle of the road and a crate motor is the most expensive route typically depending on the level of rebuild needed.