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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.
On the left you have a flat V configuration like the Berlinetta Boxer's mill, while on the right you have a proper boxer design with separate journals for opposed piston pairs. Don't get us wrong, a flat engine is a mechanical masterpiece that makes proper gearheads go gaga.