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Found the problem, there are two types of head bolts which have different length of heads, one longer than the other. We were given the bolts with the longer heads so they fouled the cams. We changed these for the shorter ones, all genuine Audi and the problems is fixed. NOTE AUDI BOLTS AREVERY...

following the breakage of a cam sprocket I have to replace the heads. Heads have been refurb, skimmed etc and turn over perfectly on the bench. the bottom also turns freely. When the heads are refitted with thickest gasket, they appear to foul the piston and cannot be turned. At this point the...