Its a good thing that you found your problem and quickly, too. I feel sorry for the previous owner who was suckered into replacing the head after the timing belt broke. There are no interference issues between the valves and the pistons on a 2.5 liter Chrysler 4 cylinder. The timing belt in my 1991 Shadow 2.5 Turbo shredded it's teeth last year while moving along at 65 mph on the freeway. I put in a new belt and all has been well since.