Agree with JBurch . there is a formula in the MP books called "Minimum et for a given speed". What they are saying e.g. If your car runs ,say, 115-116 mph and your et is 12.50 , you have a problem . Based on a chassis that is 100% efficient .
You see numbers similar to that on modern muscle cars( Challengers, etc) that are heavy with not much gear.
Absolutely nothing is wrong, they were engineered that way. By nature they are heavy and leave soft, and make thunder( MPH) in the backhalf.
Likewise you will see stock/ superstock stuff that will run( as an example) 10.50 at 120 mph.
Nothing wrong, just the available/ limited horsepower is being put to fully flogged out use.
