Are oil leaks visible inbetween your cylinder head and engine block? Did you just overheated the engine recently to a point that the engine stalled?

Common culprits before cylinder head resurfacing:
- cylinder head gasket torn, leak due to excessive heat build up.
- cooling system clogged; radiator cleaned and checked for leakage or clogged up channels. Insufficient coolant level. Check and Inspect for water pump failure.