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Plastigauge your cams if youve not fitted it yet! We bought one of these and had clearance issues. The spec is available on erwin. Also worth checking your cam bridge for wear too, if this is worn it can cause oil pressure issues.
Some years ago I got a cheap Chinese head for my shogun the mk1 2.5 diesel it lasted 3 months and cracked I now do my best yo avoid purchasing from China even though I know they can produce good quality stuff it just a matter of principle as they support Russia
You have not even started to inspect this cylinder head. You should have measured the cam journal bores and compare that with spec. (VW forum would give that to you). Test the valves in the guide and measure the valve regression and guide to valve end play. Measure from the face of the cylinder head to the base where the bolt sits (this will tell you if the cylinder head has been skimmed) get a straight edge and check for true/flatness on of the cylinder heads face. Lastly, just go over the surface area with a magnifying glass and check for porosity.
