Agree with the above. We talked about max. reving the M-30 on old valve springs before...not a good mix. No reason to take a M30 above 6K as Martin said. I am not a big fan of raised RPM shut off on custom chips particularly on a 100k mile motor.
If anything is broken...which it sure sounds like...including a rocker arm you can see with the valve cover off, the head has to be removed for repair.
George