Mismatched Cam and Heads?

The heads can have a port to small, or not flow enuff for a given engine size and made worse with a big cam. To small a port and the engine will not make power up top.

To large a port, no power down low and power only up top and often, to high in the RPM range.
The RPM head is good for a street strip 340/360 and up to approx. 372 cubes. Of course, this is build dependent. You could use the Edel. heads on a 400+ cube engine. But I would not expect it to spin and make noteable and worthwhile power past 6000 rpm. Porting the head is the answer or a move to a different head.


I might have created a bit more fog in this answer, but I hope it did get a little brighter out.