Quote Originally Posted by GasGuzzler View Post
You would be surprised how many different engines these things can have....VIN derivitives and RPO's confirm there is more than one of some of the sizes but I'm not sure of all the differences. My dad's GMT900 (NNBS) 2007 Sierra has Flex-Fuel and 4 cylinder mode but no VVT. I too thought the VVT was 6.2 only.
Okay, I THOUGHT my 5.3 had it. I'm wrong. Normally, Nathan is right. I did have DOD though. I guess I misread, because I can only find 5.3's with VVT in 2010.