The car switched back to Weber carburetors for the Series 3 in 1973, ostensibly to help the car pass new stricter emissions standards in California but most likely because Aston Martin was unable to make the Bosch fuel injection system work correctly. These cars are distinguished by a taller hood scoop to accommodate four twin-choke (two-barrel) Weber carbs. The car produced and could reach in 6.1 seconds with an automatic transmission or 5.7 with a manual. Performance suffered with emissions regulations, falling to in 1976. The next year, a more powerful "Stage 1" engine with new camshafts and exhaust brought it up to .