tunnel ram

Put them on a dyno.

It take a bunch of air speed to get them all the way open.

That's really where the 660 center squirters came from (Holley number 4224).

Even with the lightest springs in the can, they may not open all the way until almost max RPM. I've seen them never come all the way open.

The problem with the 4224's on the street was the dead fat idle circuit. Which, is an issue with any TR set up, because you doubled the idle feed restriction area without doubling the air flow.

And really, at WOT, you didn't double the air flow either. So you need to be able to tune MAB's as well, among other things.