The engine in question was Pontiac's largest displacement V8, the 455-ci (7.5-liter), which debuted a year earlier in standard and HO (High Output) forms.

The 455 V8 was Pontiac's top-of-the-line large displacement engine in its powerful muscle cars of the '70s. Iconic names like the Pontiac GTO Judge and the Buick Grand Sport also used variations ...

The Buick 455 V8 still holds significant status in the history books of American muscle. Here's what you need to know about the powerful engine.

An SD-455 was tested by Car and Driver in May 1973 and was declared, with a certain amount of sadness, "the last of the fast cars." This 455 couldn't match the Super Duty's performance when stock, as ...

This 455 couldn't match the Super Duty's performance when stock, as its L75 7.4-liter engine was rated at just 250 horsepower when new. Bring a Trailer ...

This 455 couldn't match the Super Duty's performance when stock, as its L75 7.4-liter engine was rated at just 250 horsepower when new.

SlashGear ranks Pontiac's most powerful engines by horsepower, from the iconic GTO to the Firebird leading all the way up to the brand's 2010 shuttering.

The stunningly detailed and tidy state of the engine bay, complete with 455 HO decals, makes for a car worth as much on the open market a modern sports coupe.