dynamic balancer for brake rotor

what 250-800 HP engine has the best power/weight ratio?

i dont know a whole lot about engines, but i need to know this for a project ive been working on, so it needs to be an engine that can be bought by the general public, and weight is more important to me than power. any ideas?
its going into a very


Jordan, No doubt about this one. How's a 415 lb. 410 cubic inch World of Outlaw Chevrolet Sprint car motor. They only make 950 conservative horsepower on alcohol. All parts can be purchased by the general public.

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