[gss036]

I would stay away from the GM motors. They have a real problem with piston slap. I have one in my new truck and they rebuilt the engine at 11000 miles, didn't stop it and at 15000 dropped in an out of the box factory engine. I now have 31000 on the truck and I am startting to get the slap back again. I have hear this story over and over and personally know of 3 friends who have had the same problem. Check the GM forums and read all the misery stories, a lot like the 1st stories on Mercury OPTIMAX's. GM now say's it is normal and will not do anything with the engines even though they slap. Sounds like a stuck hydrolic lifter on a cold start-up.