1)can I replace the timing gear by just removing radiator and water pump, but without pulling the engine?
Yes
2)should I go with steel instead?
Its your call. A new fiber gear is cheaper, but if you don't want to ever do that job again get steel. And I suggest you stay away from the Cloyes set. FYI, I have new original steel timing gears.
3)am I correct to assume that there's no way a piston could have hit one of the valves?
If still using a stock camshaft, it almost impossible for a valve to be hit by a piston.
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502
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