OK, so big car engines are great, but what about the latest fad in the "bike engines for cars" department. 3 BRITISH companies are currently developing V8 bike engines. 2 1000cc or 1100cc attached to specially made crankcases. Tuned to approx 330-360 bhp, huge amounts of torque, and all normally aspirated!
By the Rodney Thorne has a hillclimb Westfield with a 5ltr V8 in it, and about 400bhp. Competes in the South, goes off the line using 2nd changes into 3rd and completes a run without changing gear again, and is bloody quick!! That's real power!