We figured out what was wrong with these heads when Dave was here while testing the heads a couple months ago. It's a easy fix, if you have the right tools. To me the issue is the the seeming lack of testing of the parts at the factory and the lack of familiarity of the designer with the components. The recommended fixes and and fixes performed at the distributor also show the same problems. The fact that you have to register to look at a product the company wants to sell to me, has turned me away from the beginning.

Small business should be more aware than anyone that sending defective product will result in their demise. Sure we are in the same boat, but one of use is reaping the benefits and the other has take what we get. If not spending my money avoids aggravation, so be it. I'll stay on shore and watch the boat sink. Having worked in the hobby industry and watched companies make poor decisions, it's really nothing new.

Quite honestly, I ran into the same issue when I made my first Norvel diesel head. I knew I needed a relief on the nose of the thread, but I didn't know exactly how much and was short by a few 0.1mm. Fortunately, proper testing lead me to the issue. If it were my engine design things would be different, but that's not relevant.