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If the only thing wrong with the engine is the cylinder heads, yes you should replace just them, Getting a rebuilt motor is expensive and not needed unless the motor has been damaged beyond repair.
get a haynes repair manual for your model or a grand am of the same gen. look up the engine being either the 3400 or the four cylinder and on the cover page it should be right there.
5w30
It might be posted some where under the hood. Go to www.autozone.com where they have a great repair section that is pretty much the Haynes auto repair book online and best of all it's free. They should be able to tell you how to do any repair.
4 cylinder should be at the front of engine behind radiator 6 cylinder should be at the rear passenger side at the bottom of engine
a strong engine should read between 150 and 180 pounds of pressure in each cylinder.
about 1500 dollars
Have it towed to a garage for repair.
What engine???????? You should refer to repair manual if not familiar with auto repair and understand the terminology before attempting Remove nuts holding exhaust manifold to cylinder head & remove nuts/bolts holding exhaust manifold to exhaust pipes Use new exhaust manifold gaskets and install the new manifold securing the manifold to cylinder head (may need to but new nuts and or bolts) by "snugly" tightening manifold to cylinder head if not refering to repair manual
There should not be any problem as long as the single cylinder engine has the same horsepower for handling the load, and the mounting bolt holes match up.
Should be 110 PSI
NO. That is to low. If it is a good tight engine it should have at least 150 PSI per cylinder. You can not have any more of difference then 15 LBS per cylinder are the engine will idle rough.