"conventional" gm bolt pattern was 115 mm bolt circle diameter (like my 1993 Pontiac Transport). FOr the Equinox, starting in 2010 and at least some Buick, the new bolt pattern has a 120 mm diameter bolt circle....
Referring to numerous forum readings about this engine , the mileage you show and the condition in which it occured, I would suspect the timing chain has slipped one or more cogs. What you described has also happened to me and several others with the Ford V8 302 or long gone years and the...
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