I think the Alfa alfetta 159 grand prix engine was two 4 cylinder blocks bolted nose to nose, with everything gear driven from the meeting point of the two engines. Both engines drove the car as a single straight eight while the front engine drove a two stage supercharger.
Good for 390 HP at a fuel consumption of 2 MPG under racing conditions. 1500 CC displacement.
No fan belts to break.
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