have you checked to see if the oil pump passage lines up with the pump mine did not. what head gasket are you going to run. pressure test both oil and water passage. make sure they dont leak. this is the biggest problems. o are yourlifter boars true and straight.every block that i know of that went to a good machine found out the lifters are in the place. kent is good to work with till you need you money back. hope you get this thing running.