its a common problem with those cars. esp if a turbo motor. it shouldn't be wiped out, only if the cylinder head is warped or damaged. when you pull the head off, send it to the machine shop to get pressure tested, checked, and milled if necessary. What will kill that motor, or at least the head is if the timing belt fails or is installed incorrectly. So replace with a new one when you reassemble it, and make sure you have it lined up correctly. That motor is a major valve-bender and it doesn't take much to be off and then valves will plow into the pistons.