Back cut on +1 stainless?

[rosie]

Is there any gains to be had to put a back cut on the stainless +1 valves from TU?

THANKS
Rosie

[A.J.]

I don't know about TU's stainless steel valves but I've heard that a back cut is good. But I've also heard that grooves cut on the back is good because it helps the air roll off the valve easier. Kind of like what MPG Mike does to the ports on his cylinder heads. The third picture down I've read about doing that to the back of a valve http://www.allpar.com/fix/holler/per...d-economy.html. I believe it was a BMW thread but it's been a long time since I've seen it.

A.J.

[zin]

If they don't have one, adding it should help flow a bit, not a whole lot, but it does make a difference.

Mike

PS Sorry I missed you at the last meet, there's a long story to that, maybe sometime over a beer or two I'll tell it (next time I'm in CO)...

[rosie]

If they don't have one, adding it should help flow a bit, not a whole lot, but it does make a difference.

Mike

PS Sorry I missed you at the last meet, there's a long story to that, maybe sometime over a beer or two I'll tell it (next time I'm in CO)...

All good mike. I asked about you

Thanks for the bump

I'm hoping someone who's used these valves will chime in

[Directconnection]

It's worth a few cfm on a mildly ported 782 or g head.

[turbovanman²]

Yes, do a back cut.