I run a cat housing on my challenger and have no problems. I am going to try swaping the 180 stat first to a 160. I really hate to change the housing.

Its deffiently something with the setup becuase i followed my dad with my roadrunner (383 iron heads,pump/housing,no shroud) and i ran 170 the whole way down at 3,100 rpm.


waiting on my new timing light to come so i can see where were at. also going to pull the plugs. I'll keep updating.