By using just the right combination of parts, exceeding that magic 1HP to cubic inch ratio is indeed possible while still doing it with a pair of unported iron Ford Y-Block heads. The key here is in using a modern piston ring design and maximizing the compression ratio while still being able to have an engine that will run on available pump gasoline. Not to be left out are the intake, carburetor, camshaft, and cylinder head choices which are also just as important.
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