Ummmm not quite....
Some History.
Let us start by dispelling the belief still held by a few people that Jaguar just adapted a Ford designed V8 to create their new power unit. The truth is actually the reverse. Jaguar designed the engine in its entirety, it is manufactured in the UK, and a simplified variant is shipped over to the US where Lincoln install it in their LS model!
Jaguar's design team started with a clean sheet of paper for this new V8 engine. Nothing carried over from previous engines and the aim clearly was to produce a class leading power unit with few compromises. In most respects they achieved success and were able to devise remedies for the inevitable weaknesses that emerged with time.
More reading -
http://en.wikipedia.org/wiki/Jaguar_AJ-V8_engine
http://www.jagweb.com/aj6eng/v8_performance.html
http://autospeed.drive.com.au/cms/article.html?&A=0274
And the Aston Martin V8 is based loosely on Jaguar's AJ-V8 engine, this engine is unique to Aston Martin and features race-style dry-sump lubrication, which enables it to be mounted low in the chassis for an improved center of gravity. The cylinder block and heads, crankshaft, connecting rods, pistons, camshafts, inlet and exhaust manifolds, lubrication system, and engine management are all unique to Aston Martin. The V8 engine is assembled by hand at the AM facility in Cologne, Germany, which also builds the V12 engine for the DB9 and Vanquish.
Its currently my favourite motor so i know a little about it

