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do you have to remove engine with subframe to replace head gaskets
You can do the job with the engine in the vehicle. It's involved, though.
If you want to find a GM specialist, here's a directory link for you:
Q&A > Pontiac > 2002 Pontiac Aztek
Q&A > Pontiac > 2004 Pontiac Aztek
Q&A > Pontiac > 2003 Pontiac Aztek