Unfortunately, most of the last batch of heads that were cast had some minor porosity issues. The problem is that these flaws do not appear until the final surfacing hone, right when we expect to ship them!
While I suppose many wouldn't sweat it, it's a big deal to us, so we returned thirteen heads to the foundry for replacement. I've met with the foundry twice, as well as a third party casting expert to try to identify the problem. We determined that since it occurred at the point of greatest density, the location of the vents on the pattern was the culprit.
The pattern has now been modified to place the vents over the areas of highest density, which will allow access to draw to more molten aluminum as the head cools and shrinks. We are confident that this will fully address the issue.
What does this mean to you? Well, it means that if you haven't received your pre-ordered 23 or 25" head yet, you will have to patiently wait until mid-November. If you cannot wait that long, please feel free to email me at firstname.lastname@example.org and I will kindly refund your payment. I have also removed the ability to pre-order until we receive the new heads and are 100 percent confident that the problem has been solved.
Our apologies for the inconvenience, but providing the highest-quality, 100% USA designed, cast, and machined pure-ingot A356, small-batch cast parts isn't always a walk in the park.
If it were easy...