How to test a 90k-mile used chevy 3.1L V6 engine?

Thank wetry for quick response! everythingelse are okay with this car, but the engine. No warranty for the stated 90k-mile engine! May be I should get a rebuilt engine with 3-year warranty from Orielly? 2.5 times more expensive, but warrantied! is it a good idea? thanks

Check around the salvage yards first, here in VA. some offer a darn good warranty on used engines!

The VA salvage yards must be able to fix engines, or they must have a number of same engines, in order to provide warranty, am I wrong? I need to check around here for such ones!

A lot of the cars have low miles when they are salvaged, so the engine price is higher but warranty better! A bunch of 3.1 GM engines out there that will interchange. Usually they run these engines before removal to check them out then adjust the price. That is how it works at most of these places! A lot of engines/years will interchange, within the same make. Old Dominion Auto Parts of Roanoke Va. and others, offers a lifetime warranty to the orginal purchaser on certain engines ect. when professionally installed. So SHOP around.

The used engine is at a dealer. I believe I have to do a testing there. Is there a stress test that I could do, or have the dealer do it? thanks

It is out of the car at a dealer's place. He wants to sell it to me, but no proof for 90k-mile usage though.