Start with what the Aston Martin V12 Vantage GT3 is: a car with gasoline engine, from Aston Martin. What it meant takes a little longer.
The engineering
The engine is gasoline engine. These are manufacturer figures carried by Wikipedia and Wikidata, not road-test measurements.
Where it sits
Its Aston Martin stablemates include the Aston Martin Mark II and the Aston Martin Valen.
The record
The open record for the Aston Martin V12 Vantage GT3 carries no verified engine, output, weight or price yet. MotorJury does not fill gaps with guesses; this entry gives the model a home in the catalogue and grows as sourced specifications and photographs arrive. Corrections: corrections@motorjury.com.
Aston Martin V12 Vantage