Blueprinting is building an engine by following a set of factory specs. If the engine is to be "as factory", it will be done with all tolerances tight or lose, nut and bolt torque specification, as per the "factory blueprints".   When blueprinting and engine, some people call it a giant waste of money and time, how ever if that's the Factory Hi, Low limits that you want, we will build it!!
There is a specific sheet we follow and guidelines we stay with in.