hp the (145 kW) with triple twin-choke Weber carburettors in the "DBB"-spec DB Mark III after a Tadek Marek substantial redesign, but the engine by then was showing its age. It was replaced for the DB4 and later cars by a 3.7 L straight-6 designed by Tadek Marek. Applications 2.6 L (2580 cc/157 in3) 1948–1953 Lagonda 2.6-Litre 1950–1953 Aston Martin DB2 1950–1952 Aston Martin DB3 in 1952 – Mille Miglia, Silverstone, Prix de Bern, Empire Trophy (Isle of Man), Le Mans 14/15.6.52, Jersey 10.07.52, Boreham 02.08.52, Goodwood 9 hrs (2 cars) 1953–1954 Aston Martin DB2/4 2.9 L (2922 cc/178 in3) 1952–1953 Aston Martin DB3 used 1st time Monaco 02.06.52 (3 cars) & then Goodwood 9 hrs 16.08.52 (1 car) 1953–1956 Aston Martin DB3S 1953–1958 Lagonda 3-Litre 1954–1955 Aston Martin DB2/4 1955–1957 Aston Martin DB2/4 Mark II 1957–1959 Aston Martin DB Mark III after Marek redesign References William "Willie" Watson http://www.automotivemasterpieces.com/william-willie-watson.html Tadek Marek engine redesign DB3 History: Racing With The David Brown Aston Martin's by John Wyer Straight-six engines Aston Martin Gasoline engines by model Automobile engines