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Flat Plane Vs Cross Plane V8 engines. A flat plane V8 (animated on the left) is very much like two inline-4 engines mated together in a V configuration. Therefore end-to-end balance is inherent, as the first and last piston of a bank is always exactly in the same position, as are the center two pistons on each bank.
Of course you can see the small crank throws and the 180-degree configuration that gives this engine the flat-plane designation. Ford reps say the same engine will be used in both the GT350 and the GT350R, although the GT350R will have a different exhaust. First Look! Inside the Ford GT350âs Flat Plane Crank 5.2L V8.