So why does the tunnel ram work so well on the mopar B and RB but not on others? Dork I knew ran one on his BB chevy pro street camaro and said it would lay down till about 4000rpm and then scream. I had an M1 tunnel ram on a Challenger with 2 500cfm ebrocks. 509 cam and a 10 to 1 shortblock. The thing made power all over. Is it because mopar heads are a velocity torque head? As far as I know small block mopars do not benefit from a T ram like the big blocks do.