The Lotus 40 was an attempt to sort out some of the problems with the Lotus 30. It had a Ford 5295cc and then a Ford 5754cc V8 engine producing between 400 and 450bhp, with a Hewland LG500 transmission. The chassis was stiffened (from the 30) and a front and rear spoiler. However the car was still as difficult to drive as the Type 30, it was known as the "Lotus 30, with 10 more mistakes.". It best result was in the West Coast series in America. Jim Clark took the Type 40 to second place at Riverside in 1966, behind Hap Sharp's Chaparral.