The ex-works 1974 Chevron B-26 ‘Chocolate Drop’ Hart 420R Chassis # B26 -74 -10 Built April/May 1974 by Derek Bennett’s Chevron Cars Limited, chassis no. 10 was the works car which was debuted at the Interserie race at Silverstone in May 1974 driven by Peter Gethin. Not only was the B26 design the first Chevron to feature a monocoque aluminium tub but this car was fitted with a brand-new, development Hart 420R engine, which produced an additional 15hp over the regular Cosworth BDA. It was ...