It may be the issue, it may not be........ but it has the symptoms of a lack of valvetrain control.

I did an RPM headed 451, 272@.050 solid using very smooth high rpm lobes.
.650 lift with a 1.6...... springs 150/410....... peak power at around 7k.
Ran it to 7400........ slight signs of a loss of control on the dyno sheet at the very end of the pull, but the power barely dropped off, and there were no audible signs of any unhappiness.
Had I used MM lobes, I think it would have struggled to get past 65-6600.


Now...... back to your regularly scheduled “dead MSD-7” thread