My Dad is a master engine builder with numerous champion drag builds but he is in California and can only help via phone.
What's the old saying, "if all other options are wrong the only remaining must be the answer"? or something like that... I looked it up it's, "When you have eliminated the impossible, whatever remains, however improbable, must be the truth." How I'm trying to look at this motor.
Excellent way to diagnose engine problems!👍😊
You will find the answer, my friend!💪😊