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Do not make the holes bigger to make a slight clearance fit. It is made to be pressed.
If you you are at all nervous about the timing chain alignment - don't forget the tensioner - remove the rocker arms and you can fiddle about to your heart's content. If you haven't already checked behind the cam shaft cog - these engines sometimes have an offset key fitted to correct for chain elongation. You don't want that in there with a new chain.
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