Edelbrock 2.055 (30 degree back-cut) testing

Mean416 said

Guys talk about the back cut causing reversion and it actually costing power. I'm not saying they're wrong but I would be interested in seeing a back to back test with no other changes to see what the difference is. I bet most guys that make the claim haven't actually tested this. If anyone can reference something it would be great if you can share.

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I have tested it. One thing you can see when you have an issue is the intake ports, the intake runners and even in some cases the underside of the air cleaner lid will be sooty.

That is a sure sign of reversion. And it’s a power killer.

The other thing I constantly harp on is flowing both ports in reverse.

If you do something that increases reverse flow you can bet it will be a power loser.

You want the port to flow better forward than it does in reverse. And the further the two are apart, the more power you make.

I flowed all my ports in both directions. Certain back cuts on certain valves made more power. But it is valve specific.