GM 60-Degree V6 engine
The General Motors 60° V6 family of engines began with the 1980 Chevrolet
Chevrolet , also known as Chevy , is a brand of vehicle produced by General Motors Company . Founded by Louis Chevrolet and ousted GM founder William C. Durant on November 3, 1911, General Motors acquired Chevrolet in 1918...

 2.8 L V6 and continues to be produced today (if one doesn't count a larger block casting with larger bore center and new cylinder heads). Its use in the X-body
GM X platform
There have been two X-body automobile platforms from General Motors. All X-bodies were small entry-level models.-Rear wheel drive:The rear-wheel drive X-body underpinned the Chevrolet Nova and similar cars of the late 1960s and 1970s. It was also the basis for the Cadillac Seville's K platform...

 cars leads some to refer to it as the X engine.

It is a 60° vee block with pushrod heads, except for a single DOHC member, the LQ1.