Please Help 2006 GMC Envoy

[ItzScott21]

So I just dropped a fairly pretty penny on a 2006 GMC Envoy Denali, it has the LH6 5.3 motor in it, I drove it 3 days and then going down the highway the motor just shut off and then the starter just clicks, long story short the crankshaft is seized, what other motor blocks can I use? The junkyard only has gen 3 motors and no one near me has any LH6 motors, are there any other blocks that I can use?