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Correct, cam timing changes by 3 Deg advanced with a 2mm spacer. (calculated via CAD not physical measurement). So to move it back to Std requires a 1.5mm movement at the cam gear bolt Pcd. However a 3 Deg advance gives stronger/hotter Exh pulse with less wash back and an earlier intake open/close (better boost cramming). At 3 Deg is an acceptable timing change imo, over 4 and you've probably got the wrong cam. Hmmmm I may just leave it and see how it goes, with a 2mm spacer I have no piston contact issues from the timing change either. If I do change it I'll drill the cam gear holes to 10mm and make a series of offset hole reducers, Its dead simple and solid.
Some more cam research before I make a decision
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