Found 400rpm in the 454Mag
 

Just put the 454 back in but during the process we found all the RPM that went missing. The wire got knocked off the knock sen-cor by the outlet hose from the sea water pump, theirs a trick, cable tie that guy up and also i did some work to the intake, When i put it back in the thing would not start, Was like it had no coil. Tried everything. Had gas, spark, compression, It was the god dam injectors all seized up. Smacked them with a screw driver and put 12 volts through em and bingo. We have life, Hope this helps some one one day. Jason