They will flow 340 on the intake. The STD. Spec head will flow 260-ish. They are the spec Mopar head for Wissota dirt late models. The Ford and Chevy all flow about the same... The 362 spec motors are pigs... might as well race crate motors.
The MC heads are pretty good. My buddy has a set on a dirt open motor. 725 HP and their is more to be had he sez.
