I have seen where they can line bore the cam bearings and put actual bearing in to fix that issue, but it ain't cheap, and with the price of new heads, not worth it. If you want to see some fine work on the 2.6 heads, go to www.b2600.com - they guys are mazda b2600 truck owners that took the mitzu motors that came with them and came up with all kinds of mods. They even critique the various aftermarket heads and tell you how to make them better - check them out.