all new

a couple things about break in , if you have to loosen the glow plug the engines not warm enough , if you have to turn the flywheel with a prying device the engines not warm enough

preheating your new engine and keeping it in a certain temperature range during break in is very important when done properly there is no need to replace rod after a gallon of running as you have aleviated most of the stress on the internal componenets with the heat

i myself have incorporated the comp heat engine block heater into my break in program and am loving the results