Is there a head gasket issue with the Northstar V8's in the GXP's? A former car dealer said he quit buying the Caddis in the late 90's becuase of Northstar V8's having head gasket problems.

Yes,at somepoint in the early service of a new northstar engine,a cadillac master mechanic told me that after 5000 miles retorquing of the head bolts,was necessary to prolong the lift of the headgaskets.I have heard of many complaints from northstar owners,and of one 1994 sts northstar that I owned myself back in 1999.