It could be valves or piston failure. The cylinder head will then have to be removed to inspect the damage.
Roy
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Tuesday, March 12th, 2019 AT 3:43 AM
KEN L
MASTER CERTIFIED MECHANIC
47,185 POSTS
Hello,
Here are diagrams and instructions on how to remove the cylinder head start by draining the coolant and disconnecting the battery. Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.