Longacre Racing - Engine Leak Down Tester (LON-73010)Quickly tell, from the outside, when your engine internals are in need of attention, or an overhaul! This easy to use tester can be used to draw attention to ring seals, valves, even head gaskets. Don't wait too long to rebuild your engine, but don't do it too soon either Allows the ability to extend the time between costly teardowns and give you much more insight into what could be happening inside your engine, before the long road of teardown and