Pro Stock. The good old days

A couple of things on the nitrous accusations , I raced full time professionally for 20 years (big show fuel cars) and I know some of the tech guys that actually tore down those dodges repeatedly. I have asked them multiple times for the truth, and everytime they've looked me straight in the eyes and said nothing was ever found. Nothing in the oil pan, water jackets, frame rails, nothing. The people I know that know everyone involved say the same thing.
After the break in they moved from the 4.84 bore spacing to the 4.90 bore spacing, I was told why they weren't competitive but I don't remember why exactly. Just my .02