FIRST TWO ROCKER ARMS AT THE FRONT OF ENGINE ARE BROKEN. ECCENTRICS BROCKE RIGHT OFF. HOW DO YOU PULL THE HEAD OFF ANY THING SPECIAL I SHOULD KNOW.???? ALSO WHAT WOULD CAUSE SUCH FAILURE???? I USE CASTROL FULL SYN 5W-50 AND DO REGULAR CHANGES. ANY WEB SITES BOOKS OR POST WOULD REALLY HELP ME AND AT THIS POINT SHOULD I FIX IT OR JUNK THE ENGINE THANKS??????