Yea I see everyones concern.  Does anyone know what kind of problems I might 
run into when it comes to the EPA?  I know all 3 engines were available with 
the car and all are 50 state emissions certified, but by the book it is still 
considered tampering with emissions systems.  If it were 10+ years old, I 
wouldn't be the least bit worried.  If I was gonna keep it forever and run it 
to the ground I also wouldn't be worried.
 
I've been doing some reading and I keep getting conflicting stories on what 
exactly needs to be changed over to do a successful 3.2 or 3.5 swap.
 
On top of that, there are timing chain failures that are disasterous. 
 
Now, here's my side of the story that might be found interesting.  I will use 
this 2.7 for example.  The story was that the CHECK ENGINE light came on while 
driving, followed by the oil light and shortly after the engine started making 
all sorts of noise and supposively lost power couldn't hardly go anymore.
 
There are no codes stored in the engine computer.  Wether or not they have 
since been cleared I cannot tell.  It might be safe to assume the CHECK ENGINE 
light never came on.  You know how people are.
 
I have seen a couple 2.7's where the timing chain tensioner O-ring had failed, 
resulting in a loss of oil pressure throughout the engine when its warm.  Boom, 
oil light comes on and the chain rattling around makes noise and of course with 
no oil pressure the bearings aren't getting proper lube and either the loose 
chain gives up first causing disaster and/or a bearing spins which is also 
disasterous.  Either way a new engine is in order.
 
This is just a little theory I've come up with on my own.  There must be a 
cause of the bearing failures.  Usually its caused by lack of lubrication or 
contamination of the oil system in other engines.

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