If you have a B230F and the cam is stock a broken timing belt can not bend the valves. The valves do not go below the head deck when fully open so therefore the valves can not get bent. Stating another way, the valves when fully open do not go down far enough to hit the pistons. I have dropped a belt on a B230 while under acceleration and only had to replace the belt.
If they are getting funny readings even after replacing the belt, sometimes the pin that positions the cam gear to the cam shaft shears off. Had this happen also to a friend. Shop replaced the belt, still no compression. Had it towed to my place and found the locator pin was sheared off. New pin, new cam seal, re-timed the whole mess and drove away.
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