Question about 1993 Chevrolet Lumina
As best I can tell, it is a flat area machined into the cams of a dual overhead cam GM V6 engine. These flat areas are used to align the (4) camshafts during timing belt installation. I found a link on the web which details timing procedures, with photos. There also appears to be special tools required for this procedure.
Posted on Nov 04, 2008
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Posted on Jan 02, 2017
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