Originally Posted by mcook14
it is a 3.1L V6 if that clears it up so yes it has two heads. and every website i have read said that this is a common problem with this engine
Read web-sites and forums with care.
Assuming nothing went wrong with the intake gaskets installed, and you don't have a leaking front engine cover: Your heads likely Warped. It is not UN-Common after a intake manifold leak repair to have the one or both heads go. Nor is it UN-Common to have the bottom end go.
Yet as common as head failures are, they are normally caused by Over-Heating the engine. Also the number one cause of intake gasket failures. Less common: miss-torqued intake manifold, or even a Gasket Failure. This is all assuming everything was properly installed.
I have a 3.1L V6 with 131K that needs an engine because the bottom end has knock (rod knock). Still has the GM plastic intake gaskets, never has been opened up.
If your going to change the heads, find a set off a piston slap motor. Have them pressure tested and valve serviced before install. A machine shop will not charge much at all to change stem seals, especially compared to the pain in the sack it is to change them your self. Not changing them is asking for threads about oil fouled plugs, poisoned converter, sluggish engine, poor mileage and grey smoke.