You guys kill me with your horsepower "estimations". Absolutely fantasy. That engine you are describing came from the factory producing just about .50 hp per cubic inch. A hot nascar enginne will produce about 2.25 hp per cubic inch..and that's near
10, 000 rpms. A formula one engine is probably the highest tuned engine in the world and it makes about 3.5 hp per cubic inch at near 20, 000 rpms. That engine of yours...IF you could spin it 7, 500 rpms (and you can't), MAY make 19 or 20 hp. Or about .75 hp per cubic inch. Thems the facts.