Current testing requirements for high temperature alloys are defined in general industry specifications (ASTM, AMS), as well as in user specifications. Many of these requirements were established in the 1960's when production practices were yet to be refined.
cowling - protective covering consisting of a metal part that covers the engine; there are powerful engines under the hoods of new cars; the mechanic removed the cowling in order to repair the plane's engine.
Engine displacement is usually declared in cubic centimeters or cc, hence the label attached to car engines. A car engine generates power from the combustion of fuel. While engine displacement can affect the power generation of a car engine, there are other factors that may come into play.