The development of the high performance single-shaft engine began in 1948.

High performance engines, for example, place higher stress on the lubricating system.

High performance engines often have more main bearings than their lower performance cousins for this reason.

The 400 series was equipped with the latest electronic systems and high performance engines.

Over time, it has evolved, but still kept the general shape and architecture since the beginning with a rear mounted high performance engine.

In high performance engines sometimes sodium-cooled valve stems are used.

It had a higher performance engine, based on the GL1500, in a cruiser-style frame.

It is also becoming a high performance engine.

It was released in 1968 and remained a high performance engine through 1971.

With total sales and production off by 2/3 from 1970, the performance engine 1971 Challengers are the most rare.