Can you seal a cracked head on a 1989 Chevy Corsica?

Answer 1

No, unfortunately a cracked head is pretty much through. It's only worth scrap metal prices. The pressures and temperature changes in a head are sufficient that any attempt to seal the crack would fail next time the engine warmed up. If the head is cracked, your only option is to replace it with a head that isin good shape, or get rid of the vehicle if it's not worth the expense to you. You can purchase a used head from a wrecking yard have it milled to make it flat and have the valves and guides reconditioned. If you can replace the head yourself you can probably do the whole job without too much expense, (under a couple hundred) but make sure you take care of the valves and machine the head before you try to put it in your engine. If you buy a used head from a wrecking yard, have it "magnafluxed" before you do anything else. Often a wrecking yard will put a mark on the head to show that you bought it from them. If you clean the head before you have it magnafluxed, you won't be able to take the head back if it too is cracked. A used head is not a bad idea, typically GM and Ford heads are fairly tough and don't crack if the engine isn't overheate.