Retro rallycross regulations state that engines are free but it must be a pre 1990 production engine of the same configuration/number of cylinders, and in the same position as the original. The VR6 first came out in 1989, is relatively cheap and far more reliable and powerful than the original Dino engine (which is of course also prohibitively expensive, IF you could find one). It took a bit of engineering, but we have done much harder conversions in the past, This is an old block used purely for the mock up and installation
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