Horsepower limit for out of the box Edelbrock RPM heads

gzig5 said
Do these heads that flow 300+ work worth a crap in the lower rpm ranges, say in a street or road course car? For my use cases, a nice flat torque curve from 2500 rpm on up is more desirable than a few more HP all on the top end. Obviously cam selection plays here but does a 370 cfm Victor or Indy 360-1 have good port velocity for responsiveness?

A lot of how much the head is ported and how well it works is a combination equal to the entire engine package.

In an example, a prepped stock port Edelbrock head is (IMO) just great for a mildly hopped up 340 or 360. It is the port volume that lends itself well for this CID area. On a 318, it is close to a nice high performance head. Not exactly the head with grandma in mind.

This basic overview also applies to the performance scale going upwards. In order to have a well rounded package on a fully ported set of heads, the rest of it has to be there to support it. While it is possible to use less than the head can handle and have a nice package, you have to ether maintain the balance of the target area of port volume to the CID for the goal or you can over head the engine.

To much head drops low end torque a bit. How much it drops is combo dependent.
CID dependent, cam size, etc... Everything comes into play to some degree.

It’s realy impossible to predict.

For your example above, we would need to see the whole combination and not just the engine spec’s.

pittsburghracer said
Did you ever see the post I did on port molding. Looking at a port in 3D is so nice to be able to do

Yes sir, sure did!