My truck has 44k I'm doing a cam Swap with a chapacabra, cam and comp. Lifters not original g m because their s*** sucks, but all in all with me working at a shop But having somebody else do the work because I don't have the time nor the space at my house. It's going to cost me around $5000. I would not recommend putting GM's original equipment back in the vehicle. Because you're going to run into the same problem again.