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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.
A flathead engine (a.k.a. sidevalve engine (SV), flathead, or flatty) is an internal combustion engine with valves placed in the engine block beside the piston, instead of in the cylinder head, as in an overhead valve engine. As the cylinder cross-section has the shape of an inverted L, other names such as L-block or L-head are also common. The sidevalve's poppet valves are usually sited on one side of the cylinder. A recess in the cylinder head creates a corridor connecting the valves and the c