Lampredi Twin Cam 4 cylinder ( Fiat, Alfa, Lancia ). Best designed 4 cylinder in the universe, heck, everybody copied it. Bombproof, rally winner, simple, easy to get parts for, not that expensive, spins in the right direction. Put some compression into it and keep the cam timing near stock, should mpg well.
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Volvo WIA42 VED-12 / 335 hp / 1300 ft/lbs / 9 mpg
Big n' Boxy, Never met a Hill it Didn't Like
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