Head flow data wanted

[sctrailrider]

Hi everyone, I have this question posted on several other forums and I am finding out there isn't any posted real data.

I would like to know if anyone has real before & after data from head flow numbers from head porting...

I already know Diesel Depot stated a % a long time ago in a magazine, that isn't real data.

Does anyone know of any testing done in this area in the past with real numbers??

Thanks

[a5150nut]

Might try a search here. I remember years ago it was brought up but IIRC there was not much gain due to the fact that with a turbo it was already under pressure and you don't get the gains as you would on a gas motor.

[trbankii]

I seem to recall that Ron Schoolcraft did some looking into such things once upon a time.