Me as well but looking at the pictures of them they are pretty sad. We will never know until someone does one.

You may gain nothing for example. Although there are head flow testing machines that may indicate there is good or really bad flow issues or not. In relation to the engines needs used.

They may be adequate as is. When I was looking at a ninety degree turn in the head. That was also seriously restrictive in area and very rough as well. Plus the massive amount of metal that guy took out on the 617 turbo head. I even wondered if it might also weaken the head structurally.

Perhaps this issue might be better in the increasing the power portion of the site. Chances are they may already have dealt with it. I will go have a look in the next few days.

Again what triggered this is adding a turbo to the 616 I remember people mentioning did not do that much. Or at least not what I would have thought. Although it could have been not enough fuel.