yeah so despite my attempt to save the motor it appears it's on the way out. took the rig to AOP few weekends ago and the knock is still there around 2500-3000 RPM so it's only a matter of time. That said, looking for options on where to go now. As I see it I have at least 3 options: Rebuild current motor: +/-$1500 3.4 Swap - about the same $, bigger pain in ass Preferred - source an extended cab parts rig with running motor and transfer everything over - would go Extended cab for the wheel base this go around. Remember, everything I have currently is 23 spine (R150F tranny etc...) or, are there other economical options I'm missing???? And don't say LS or anything V8 please, toy axles wont hold the power and I'm already pushing the boundaries. How bout a 4.3 Vortec for instance. I need educated!!