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There is no honest way to determine the HP of an engine without knowing the specifics. The camshaft specs, the cylinder head specs (ported? Valve sizes? Valve springs? ) , the piston type (flat top, dome, dish, etc) etc. They can range from 150 HP to as much as 400, though the 400 would take an incredible amount of money. I know this is an old question, but the SA answer that was previously here was insulting.

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2015-03-15 03:11:43
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Q: What is the specific horsepower of a 1963 283 bored 060 over?
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