Cylinder Head Exhaust Flow

[Mike Taylor 3601]

Loosen lash on exhaust .005 rockers see if that helps, that will remove some duration to show you if that is what it is wanting,also can restrict exhaust and see if helps.
Also if have flow #'s if you haven't done so, take intake flow #'s from all lifts and average them, if new heads have same or lower average# may not make better power.
Mike Taylor 3601

[R. Thorne]

Like Mike said, it's total flow that counts. Also, velocity is a real consideration. If they flow the same cfm on intake but there is turbulence on one head and not the other, then power will be down. Ron.

[SSDiv6]

Airflow is not linear.

Velocity and behavior of the port is more important than flow numbers.
When flowing heads, a quiet port will make more power than a loud port.
There will always be some turbulence in the port, and many times, necessary.

In addition to the flow numbers, the performance and power is dictated by the camshaft events. If possible, flow the intake and cylinder head as a system.

Like Alan and I recommended earlier, contact a reputable cam manufacturer and share all the numbers including the depression that it was tested at. they should be able to grind a camshaft to maximize the flow curve.