When you have an engine that has separate cylinders as our Type 1 and Type 4 engines have it makes it a must that the cylinder heads are perfectly parallel. The measurement I am speaking of is the depth of the head where the cylinder and the head seals. If the depth of one head chamber is different from the other it will cause the head to not lay perfectly flat across both cylinders and then they will leak compression and not seal. In this case one cylinder sealing area was .003" lower than the other. This is fixable by anyone with a good machine shop and some know how. If this was the only issue my engine builder would have touched the head off and made it parallel. The valves leaking and looking like they did was a more troubling issue. We think the valves were made of soft material or the valve guides are not perfectly in line with the valve seats causing the valves to hit the valve seat out of square. They should not have had the ridges worn into the valve edge. So being as we returned the heads for inspection and repair once and were told the heads measured to be perfect and were good to go and they came back still not right, I decided it was time to bail on these heads and buy the LE200 heads that appear to be nothing short of amazing. I should have known from past experience. Good heads make the engine and buy the best heads your budget will allow. That said, I was happily surprised that AA Performance has offered to refund my money upon the return of the heads and port matched intakes. I have to say this is at least a sign they want to make this right and do the right thing. At the end of the day the engine is going to end up better because of this ordeal.