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since new belts are being installed at the time of a head gasket (never reuse belts) the cams need to be reset, so marking them, while helping in reassembly, will not preserve timing
to do it really right, you need dial indicators and a special tool - i had my cams timed and it made a significant improvement over stock timing - stock was "close" but not perfect - the workshop manual does not specify how to time them though - it only gives you the procedure that gets you "close" - runs fine that way, but better when really dialed in
again, pete can fill you in more on this - he is one of a very few who actually know how to do it - most shops don't know how or don't even know that you can
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