Reboring of engine

When oversized pistons are used, the capacity would be increased and more air can be drawn in which would increase the hp but it is not going to be something to shout about.

To make engine faster, there are a few things that works but not something extraordinary.

Polishing the intake and exhaust ports to make them smoother helps the air flow.

Increased air intake and additional fuel and faster expulsion of the exhaust gases have to be taken into consideration.

Advancing the valve timing slightly helps, so do advancing the ignition timing, but not by too much.

There's a lot more to do and more expensive stuffs to get a faster moving machine like them cars on NASCAR-Yours will do with Mr. KHLow suggestions-anything is possible we can also build you a rocket if you wish we have our own scientist here-called the Medic-lol