It is a common misconception that the Lotus 900 series engines were modified Vauxhall engines. The 900 series was designed by Lotus as their first self developed engine, and due to similarities in dimensions and layout, Vauxhall 4-cylinder iron blocks were used as testbeds for the Lotus DOHC 16 valve cylinder head.
The 900 series engine was introduced in production form as the Lotus 907 in the 1972 Jensen-Healey, and went on to power Lotus into the late 1990s. It is regarded as the first modern DOHC, 16-valve production engine made. The Jensen-Healey was released for sale to the general public with the first 907 engine shortly before the Cosworth Vega which also had a DOHC, 16-valve engine. Pre-war DOHC 4 valve per cylinder production engines included the Duesenberg and the Stutz DV-32 straight-8 engines.
Read more about Lotus 900 Series: 904, 907, 911, 912, 910, 920
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