Flow Data from Intake Valve Relocation

Newbomb Turk said

That’s why following one man’s opinions as gospel is bad policy.

Larry Meaux says he flows his heads backwards. How do you know what the port will be like for reversion if you don’t flow the port backwards?

I’ve seen heads that flowed big numbers and they didn’t make power. I flowed them backwards and guess what? It flowed about 85% in reverse. That’s pretty high.

Once you see that you can fix it. And of course we aren’t working with the same heads he is. There is only so much you can do with the ports you are working on.

Just about anything that stops reverse flow even if it hurts forward flow will make more power.

If you don’t flow the port backwards how do you know?

Same with the exhaust. Some Chevy ports will flow in both directions at the same time. That hurts power.

Curtiss Boggs just did an interview and most of what he said aligns with my testing and not the orthodoxy I’ve heard for 40 plus years.

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Point taken, but not necessarily agreed with. I do appreciate having my thinking challenged. It's how we learn new things.

Now here's why I say I don't necessarily agree. I am thinking street head which means less overlap. A 50 degree seat will help prevent reversion. A 40 degree top cut will really help prevent reversion, especially if we compare it to a OOTB Edelbrock with their crazy 0 degree top cut. With the intake and exhaust valves sunk in their individual 'cones' there will be almost no line of site between the two. So in my way of thinking even if they do flow well in reverse (which I do not expect) I would not do anything to try to hurt forward flow just to prevent reverse flow. But I will admit, that just may be my current level of understanding. It changes all the time. I'm open to learning new things, but I usually need proof.

I really do appreciate the input. I'm here to learn and share, not argue. I hope that comes across in my 'tone'.