Looking for X Head Picture

[66fs]

Good stuff. Thanks for sharing. Am I seeing only 3 angles there, or is there 4? Clearly there is a bowl cut (probably 75 deg) and a 45 degree seat cut and a chamber (top) cut. Is there another angle?

I'll check when I get it cleaned up.

 

[Woody500]

Flowed it this morning. The only 2.02 3/8 valve I have is a Hughes. It has no back cut. I believe an OE valve would reduce my low and mid lift numbers and increase the numbers around 0.500. The vaporization ridge (if that's what it really is) helps the port 'hold on' a little longer before backing up.

587 head with 1.88 OE valve included as a reference.

View attachment 1716444831

Please explain Vaporization Ridge, as I could find no information on it. Thanks.

 

[PRH]

It’s the “lip” where the seat angle meets the backside of the oe valve.

 

[Earlie A]

Please explain Vaporization Ridge, as I could find no information on it. Thanks.

The arrows in the picture all point to vaporization ridges. The sharp ridges help reatomize/vaporize liquid fuel.

 

[Woody500]

With as much knowledge as there seems to be around here, why hasn't anyone come up with something better?

Once again the aftermarket doesn't deliver products that are wanted/needed, and would sell.
Not very good business when so many would upgrade to what is known to be needed/wanted!

 

[Woody500]

The arrows in the picture all point to vaporization ridges. The sharp ridges help reatomize/vaporize liquid fuel.

View attachment 1716447781

Looks like an edge to make air flow tumble. That means it's not all about linear flow, as many discussions seem to imply.
Don't tulip valves do a similar thing differently?
So back cuts not worth doing at all or ok on some valves?
What other areas need less work than believed by most?
And chamber edge shouldn't be blended smooth either?

 

[Earlie A]

So back cuts not worth doing at all or ok on some valves?

Back cuts are really good on most any intake valve. The ridge left by the angle change helps break up the fuel. The vaporization ridge is not seen much anymore as far as I know. Just on older OE stuff.

Some people will back cut an exhaust valve, but most say no back cut there.

 

[RustyRatRod]

Once again the aftermarket doesn't deliver products that are wanted/needed, and would sell.
Not very good business when so many would upgrade to what is known to be needed/wanted!

Whatever the heck that means.

 

[Woody500]

Whatever the heck that means.

It means nobody is paying attention.

 

[RustyRatRod]

It means nobody is paying attention.

Guilty as charged.