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I had the same thought this weekend after timing my cams:
As Wayne's book suggested, I clamped the tensioner arms "quite" tight and timed the cams to 1.26mm (49.6 thou). My actual measured values were 52 and 51 thou. After replacing my non hydraulic tensioners I measured again, now they were 47 and 46 thou. I removed the tensioners, re-clamped the arm and measured 52 and 51 thou.
I’m guessing that this is why there’s a tolerance on the timing?
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