Aaron, there has been a few problems with head gaskets, the bigger problem was with the intake manifold gaskets.
Check the attached links,
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Intake Manifold Gaskets May Leak Coolant or Engine Oil Buick Century...
Coolant Leaking From Intake Gaskets GM 3 1L 3 4L
Thread how do tell if my headgasket or intake gasket is bad
1997 Buick Century Blown Head Gasket
SOURCE: Need to know roughly how long it would take to
Depends on your level of experience, quality of your tools and whether or not you have any frozen head bolts. The valve assembly and head come off as one unit on those. To clear the wires, emmision controls ect off of the top of the valve cover 30 minutes. remove valve cover 5 minutes (too scrape off excess gasket material. to remove exhaust manifold from side of head, (assuming no broken/stuck/stripped bolts 15 minutes with good hydraulic tools. To remove head (assuming all goes well and hydraulic tools, 15 minutes. To reassemble, double all times as surfaces need to be prepped and gaskets applied and proper torque on all bolts. It's an afternoon job if you ahve everything you need and nothing goes wrong. Typically add at least two or three hours of drilling and cursing to a head gasket replacement. and a trip for new drill bits and a tap (not beer) for the new hole you drilled.
SOURCE: I need an engine diagram of 2003 Buick Century
The best thing to do is go to the library.They have service manuals there you can just check one out.They are not the factory ones but they have all the information you need to do the job.Good luck.
SOURCE: are the 3.7 liter jeep liberty known for head
any vehicle can have any component fail at anytime. The only way to know is to have it inspected for the correct diagnosis if your experiencing problems. If you want a second opinion because you don't trust the first one then your only going to get that at a repair shop.
SOURCE: HOW TO FIX A BLOWN HEAD GASKET ON A 1997 PONTIAC
This is a very lengtht process so my suggestion to yoy is to go to an auto parts store and ask for a "chilton book" for your vehicle.this book will walk you through the process
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