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When installing a timing chain on a new engine, the engine must be at TDC on th eintake stroke and the timing marks should point at each other.  Meaning, the crank sprocket should have the mark at the 12 o'clock position and the cam sprocket should have the timing mark at the 6 o'clock position.  That's for a NEW engine, or one getting rebuilt and the initial install of the timing set.  For a running engine, you really only have to put the new chain on the same way the old one was, though if there is a lot of stretch, possibility of jumped teeth, etc, it is best to set it at TDC and go from that baseline. Keep in mind that the crank rotates twice for every single rotation of the cam.  So it is possible to get the timing gears with both marks at the 12 o'clock position, but that is not TDC on the intake stroke, but on the exhaust stroke.  You definitely do not want your cam to be 180° out.
 

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Discussion Starter · #3 ·
PLenty of slop in this old chain. Tried uploading a video but the site doesn't like my video. At tdc the timing marks lined up as you stated at 12&6. Until the next question! Thanks!!!
 

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even if you line them 12 and 12 ,  the cam is still correct , just the dissy is off 180 ....  don't think so ? crank the crank ounce around .... wow now they're 12 and 6 ! AND piston is back at tdc ...
 
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