If you are referring to the port area around the valve seats, my engnbldr RV, os valves, etc head was very badly machined and the valve seats were not concentric. None of the exhaust valve were closing. The valve springs were crooked and not sitting square on the table. The valve seats were so bad that John said the machine work to fix it and install new seats would be WAY more than buying a new bare head and him putting in the valves. He could not confirm who manufactured my head.
There are a number of advertised sources for 22 heads, knowing what I know now, I would only buy from 22RE Performance, LCE, or my local head shop.
Gnarls.
I now only buy a head that I can inspect BEFORE any work is done. I don't care what shop I'm dealing with. I have a head on the shelf that I bought sight unseen that I actually lucked out on and the seats are really close to the ports. The 20R head I have was the best out of a stack of heads I looked at. I'm a bit fussy. I can tell you to definately go with a reputable shop, but even then you can't tell.
