Highest HP /6 ?

Badvert65 said

I was just curious how far people might have gotten with normal aspiration on these engines. I am just shooting for 225 (1 HP per cubic inch).
-Matt

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It can and has been done, but be prepared for a finiky, race type engine at that power level. That's why turbos are popular on slants. Simular power, but more drivability.