Editing Vauxhall Slant-4 engine (section)

===Design===
The Slant-4 gets its name from the fact that its [[cylinder (engine)|cylinder]]s are inclined at an angle of approximately 45° from vertical.<ref name="vauxhall"/> This layout came about because Vauxhall had originally planned to develop a whole family of engines all built on the same production line. There were to be slant-4s and V8s in both petrol and diesel versions, designed under the guidance of Vauxhall's then chief engineer, John Alden. Although a V8 petrol prototype and several 4-cylinder diesel prototypes were built only the 4-cylinder petrol engine made it to series production.

The engine has a [[Overhead camshaft#Single overhead camshaft|single overhead camshaft]] driven by a timing belt. The Slant-4 was one of three engines using this method of driving the camshaft released the same year, the others being the [[Fiat Twin Cam engine]] and the [[Pontiac straight-6 engine#Overhead cam|Pontiac straight-6 OHC]]. Prior to 1966, belt-driven camshafts had only appeared in the [[Glas 1004]] series starting in 1962 and in the few [[Devin Enterprises#The Devin Panhard|Devin-Panhard]] cars built starting in 1956. The camshaft operated two [[Poppet valve|valve]]s per cylinder. An ingenious valve train design incorporating an inclined [[screw|socket head cap screw]] allowed valve clearances to be adjusted with a [[feeler gauge]] and an [[Allen key]]. The block and [[crossflow cylinder head|crossflow]] head are both of [[cast iron]]. The layout lowers the overall height of the engine, which allowed for more [[aerodynamic]] vehicle bodies to be achieved by lowering the [[hood (vehicle)|bonnet]] line. It also means most of the engine is very easy to access for maintenance, with the exception of the [[exhaust manifold]] and [[spark plug]]s, which are "underneath" the slanted cylinders.