Schumacher headers 440 in 71 Duster

Back to you don't know squat. I never said I ran the stock manifolds, just that the Schumachers are better than the stock manifolds.

I will repeat, it is always not about horsepower with a street car, which most of us have.
If its not about horsepower than why do you have a big block? Are you just compensating for something? That would make sense now.