The matter between pitch and thrust has been subject to myth. There has been an article by leading characters that stated pitch has no influence on thrust, because the pitch did not enter prop efficiency formulae.</p>

Let me tell you this:</p>

Thrust is directly related to power (more or less) So high pitched props, because they can absorb more power, will produce more thrust if turned at the same rpm as their low pitch brother.</p>

Another myth is stalled props. That will not happen as long as the pitch is not larger than the prop diameter. Reason: The prop creates it's own vortex with prop air entry speed. This speed keeps the blade angle of attack within the angles at which blade foils will stall.

As to engine porting, this can fill books. See http://prme.nl/forum/viewtopic.php?t=443</p>