TIL General Motors built a 61 Chev Impala with a flat / boxer type 10 cylinder engine and front wheel drive
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Engine Prototype: The Stillborn Corvair Gen2 Modular Engine – From Two to Twelve Cylinders
https://www.curbsideclassic.com/automotive-histories/engine-prototype-the-stillborn-corvair-gen2-modular-engine-from-two-to-twelve-cylinders/
(first posted 6/14/2017) A ten cylinder Corvair engine installed in a FWD ’62 Impala? How’s that to get the juices of a hard-core Corvair air-head going? One of the highlights for…
This was built as a test/ prototype, and was an ancestor of the FWD 1966 Oldsmobile Toronado and 1967 Cadillac Eldorado. The engine was a prototype of a modular engine family that was intended to range from 2 to 12 cylinders, based on the Corvair flat 6. Only 2, 4, 6 and 10 cylinder engines were built before the project was abandoned