Inline 6 are more simple than your standard V8. Easier to work on too, IMO. that 250 was preceeded by the "blue flame" inline sixes. Simple OHV, water cooled motor that was a GM staple until the 80s.
Here is a Wiki article.
The stroked 250 version produced 155 hp (116 kW) for Chevrolet and GMC, with a 37/8 in bore and 317/32 in stroke. Between 1975 and 1984, an integrated cylinder head was produced, with one-barrel intakes for passenger cars, and two-barrel intakes for trucks after 1978.
During the mid-1970s, the Buick 231 and Chevrolet V6-90 (basically a variant of the Chevrolet small block V8) were replacing the Chevrolet 250 for use in passenger cars and light duty trucks/vans. Passenger car use of the 250 cu in (4,093 cc) engine was discontinued after the 1979 model year for North America (along with the Chevrolet 292), since the six was restricted to light truck usage (the 4.1 was discontinued after 1984 in North America, where the Vortec 4.3 V6 became the base engine).
This engine was used on the following vehicles:
1966–1984 Chevrolet (passenger cars to 1979, trucks/vans to 1984)
