So my Monte Carlo has a little over 12,000 mile on the over the top built 454... While driving at about 55mph the MSD distributor rotor came apart completely killing the motor.... It is the second time this has happened.... So after I put on the new MSD distributor the motor ran like crap...so I did a compression test and it read like this...210,205,210,210,185,210,205, and 0.....,, pulled the head found no problems all roller rocker/ push rods are fine, springs are fine, even the piston seems to be working fine.... So where else could the compression be going????