@USA-1
Great link ... with a lot of history.
As good as GM V-6s are today, I did get to experience the odd-firing (Buick) variant back in the day ... and it was not pretty. I'm sure the basic engine structure would go for the long haul but the timing chains would not. I wonder how many of those V-6s of 1975-1977 vintage are still on the road today, even if with ridiculously low mileage. I always look at the badging of the vehicle if I see one of these on the road.
The link lauds the Chevrolet in-line 6. Our family had one. I don't know what the moniker (not stovepipe, Fireball, Vortec) was for the 250 c.i., 1 bbl., L6 that was around in the '70s. My dad had this engine in a base LeMans. The sound was different than that of a GM V-8, that's for sure. However, it seemed to be every bit as smooth and dynamically balanced. My dad preferred Olds and Buick; however, this basic Pontiac was the most reliable car he had ever owned.
And, isn't it nirvana to look at an old inline 6 and be able to touch every spark plug ... with nothing in the way?