When my timing belt broke the valves bent, but did not break. I had no piston or cylinder wall damage, so I slapped on a new head, head gasket, and timing belt. There's no way to tell until you pull the head off the motor though.
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2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
Team B.O.B.® - Ballaz on a Budget