The Buick Straight 6 was an engine manufactured by

Buick Buick () is a division of the American automobile manufacturer General Motors (GM). Started by automotive pioneer David Dunbar Buick in 1899, it was among the first American marques of automobiles, and was the company that established General M ...

from 1914–1930 and was exclusively used in the

Buick Six The Buick Six was a top level automobile produced by GM's Buick Division which was first introduced in 1914, and was the senior vehicle to the Buick Series B Four. It was an all new platform which was shared with the Oldsmobile Six and was the f ...

platform, then later in the

Buick Master Six The Buick Master Six Series 40 and Series 50, based on the wheelbase used, was an automobile built by Buick from 1925 to 1928 and shared the GM B platform with the Oldsmobile Model 30. Previously, the company manufactured the Buick Six that us ...

and

Buick Standard Six The Buick Standard Six Series 20 was manufactured by Buick at the Flint Wagon Works factory of Flint, Michigan, and was the junior model to the Buick Master Six between 1925 through 1929, and shared the GM A platform with Oldsmobile, Oakland an ...

. They were OHV, like their previous engines, as Buick had been almost exclusively using

overhead valve engine An overhead valve (OHV) engine, sometimes called a ''pushrod engine'', is a piston engine whose valves are located in the cylinder head above the combustion chamber. This contrasts with earlier flathead engines, where the valves were located b ...

s since the Model B in 1904. The engine also had the starter and generator in a single unit. The first six cylinders engine was cast in pairs (3x2 cylinders). The 224 and 242 CID did not have a removable

cylinder head In an internal combustion engine, the cylinder head (often abbreviated to simply "head") sits above the cylinders and forms the roof of the combustion chamber. In sidevalve engines, the head is a simple sheet of metal; whereas in more modern ov ...

, meaning the cylinders and valves came off as a unit, (although with the valves in cages, the cages were removable individually), and pistons had to come out of the bottom of the unit as it was removed. This was colloquially called a "jughead" engine, since the jugs (cylinders) came off with the head. Since 1924, all engines had a removable head. They had a displacement ranging from depending on year and model. In 1925 the series was divided into the lower priced

and the high-end

series. The

Buick Straight-8 engine The Buick Straight-8 engine (Fireball 8) was produced from 1931 to 1953 and sold in Buick automobiles, replacing the Buick Straight-6 engine across the board in all models in 1931. Like many American automobile makers, Buick adopted the straight-e ...

replaced the straight 6 across the board in all models, in 1931, and was the basis of the

Holden straight-six motor The Holden straight-six motor is a series of straight-six engine that were produced by General Motors Holden at their Port Melbourne plant between 1948 and 1986. The initial ''Grey'' motor was so dubbed because of the colour of the cylinder block, ...

References

* Slauson, H. W.; Howard Greene (1926). "Leading American Motor Cars”. ''Everyman’s Guide to Motor Efficiency''. New York: Leslie-Judge Company. Buick engines Automobile engines {{Automotive-part-stub