What engine designed to power medium duty trucks and heavy cars was also used in Chevy's intermediate and pony car?
The Chevrolet "Big Block"
Title: Chevrolet L72
Passage: The L72 was a Big-Block engine produced by Chevrolet between 1966 and 1969.  Initially rated at 450 horsepower, the rating dropped to 425 horsepower shortly after its release (although there was no change in power).  In 1966 it was the most powerful engine available in the Corvette, and between 1966 and 1969 was the most powerful engine available in full-sized models.  In 1969 the L72 was available via a Central Office Production Order (COPO) in Chevrolet's intermediate (Chevelle) and pony car (Camaro).  Today these vehicles - referred to as COPOs - are among the most collectible 1960s performance cars.
Title: Chevrolet Big-Block engine
Passage: The Chevrolet "Big Block" is a term for a series of large displacement V8 engines that have been developed and produced in the United States from the 1950s to the current day.  As American automobiles grew in size and weight following the Second World War, the engines powering them had to keep pace.  Chevrolet had introduced its popular small block V8 in 1955, but needed something larger to power its medium duty trucks and the heavier cars that were on the drawing board.
Title: Pontiac West Assembly
Passage: Pontiac West Assembly was one of several General Motors assembly plants in Pontiac, Michigan located along South Boulevard West and Franklin Road.  It was originally called the Rapid Motor Vehicle Company until 1909 when GM acquired the company, renaming it GMC.  It served as the original location of GM trucks, including military equipment for World War II.  In 1972, it was joined by a new facility, called Pontiac East Assembly that built GMC and Chevrolet medium duty trucks and buses.
Chevrolet Big-Block engine Chevrolet L72