Re: peter ryan
If the engine will run, put the nuts back on but leave loose like about 1/16 inch and start the engine . Of course drain it first. Start the motor, it will stop when the head pops loose. If it keeps running don't over heat it and try something different. If you are taking the studs out take your time if they seem tight. Penetrating oil, a small hammer, paraffin and heat can be your friend.
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