Hi: I have a 1994 Cadillac DeVille: 4.9 Liter V-8 - not NorthStar: Head Gasket blew 11 months ago. At that time I sucessfully applied Dura-Seal which cured my problem. I drove 26,000 miles and now my head gasket blew again. I re-applied head gasket patch. No more leaks however engine...
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