Highest flowing sbm heads?

You’d be surprised. “Street manners” is very subjective and as I always say…95% of the time not having ”street manners“ is tuning.

And I don’t care so you are, making 2 HP/CID is a *****. Thats why you don’t see it very often.
Exactly, my Dart has a 266/271°, .711/.719 solid roller and gets street driven a lot.