dwb91lx

Where's the easiest flow numbers come from on GT40 3bar iron heads...got up to 215/168 currently.

dawson1112

I don't understand the question!

What do you mean where does the easiest flow numbers come from?

tinman

What lift and what pressure are you measuring at?
Sounds awfully good to me......

dwb91lx

215/168 @ 400-450 lift... .28" flowing from .1 through .6 lift but mostly interested in low/mid ranges (above .2)

tinman

I'd make sure that everything is calibrated real good, those numbers sound awful good to me........

dwb91lx

What do you mean, calibrated...his test equipment?

tinman

Exactly.......

barnett468

What is your question?

dwb91lx

Question was for those that have actually ported GT40 (non-p) heads. I understand that the idea is to achieve the most increased flow by removing the least amount of material...the question is...where is that location @ that gives the best flow results...is it the intake port/throat/bowl or exhaust port/throat/bowl?

barnett468

That is a bizarre question imo, because the intake and ex are separate.

The intake obviously, naturally flows more than the ex, so even if you port the exhaust, the intake will still flow more.

This means that porting the intake will provide greater flow than porting the ex.

If one were to port one area or another of either the in or ex, the biggest increase in flow is typically achieved by properly porting the bowl, blending the valve guide and doing a 3 angle valve job.