Aston Martin AJ37 4.3 4.7 5.0 V8 DOHC engine
From 2005 on

Aston Martin hand-assembles a special version of the AJ-V8 for the 2005 V8 Vantage known as AJ37. This unit displaced 4.3 L (4280 cc/261 in³) and produces 380 hp (283 kW) at 7000 rpm and 302 lb⋅ft (409 N⋅m) at 5000 rpm. This engine is unique to Aston Martin and features race-style dry-sump lubrication, which enables it to be mounted low to lower the centre of gravity. The firing order is the same as the other AJ-V8 engines although the cylinder numbering is different (AJ37 = 1-5-4-2-6-3-7-8 vs. AJ26 = 1-2-7-3-4-5-6-8).

Aston Martin 4.3 L Engine specifications 

The engine is assembled by hand at the AM facility in Cologne, Germany, which also builds the V12 for the DB9 and Vanquish. The cylinder block, cylinder heads, crankshaft, connecting rods, pistons, camshafts, inlet and exhaust manifolds, lubrication system and engine management are all unique to the Aston Martin version.

Aston Martin 4.7 L Engine specifications 

In May 2008, Aston Martin released a new design that used pressed cylinder liners instead of cast-in liners. This allowed for thinner liners, and a higher capacity of 4.7L for the V8 Vantage. Power output increased to 420 bhp (an 11% increase on the previous 4.3L unit) and peak torque to 470 N⋅m (350 lb⋅ft) (a 15% increase).

4.3 bore 89 mm (3.5 in) stroke 86 mm (3.4 in)

4.7 bore 91 mm (3.6 in) stroke 91 mm (3.6 in)

Applications:

2005–present Aston Martin V8 Vantage
AJ-V8 Gen III
An all new direct injection 5.0 L engine family was introduced in 2009 (all new engine block). New featuring: spray-guided direct-injection, continuously variable intake and exhaust camshaft timing. The naturally aspirated engines also feature cam profile switching and variable track length inlet manifold. Supercharged engines make use of a sixth-generation TVS® (Twin Vortices Series®) supercharger. The 2010 model year engine conforms to EU5 and ULEV2 emissions regulations.

The engine is controlled by Denso's Generation 1.6 Engine Management System.