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Originally Posted by Ralph69220d
The fact you have circ-clips means that chain has been replaced. The 2mm protocol is the most accurate, but you can line up the cam mark with the cam tower and then look at the crank pulley to see if you need a new chain. Make sure the chain tensioner is functioning properly as insufficien tension is going to retard the cam a bit. No need to replace the chain if cam agrees with crank. But, if chain shows obvious wear marks then replace it.
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I concur except for the chain tensioner bit. Insufficient tension due to chain tensioner wear or malfunction would not retard the cam. (Unless the slack becomes so great that it can jump a tooth, then all bets are off.) If you analyze the chain path, you can see that the chain tensioner is located on the "loose chain" side of the camshaft sprocket. The camshaft sprocket is being pulled by the "tight" side of the chain as it comes from the IP and the crank sprocket.
Chain wear (or stretch as many prople call it) will cause the IP to be retarded and the camshaft to be somewhat more retarded.