I ran across a very interesting little program this week.  It is on the American Historic Racing Motorcycle Association website ( AHRMA.org ).  Go to the LINK section....there are a  L O T  of links....go all the way to the bottom and the very last link is "TOP SPEC"... a downloadable file.  


This program will calculate:

DISPLACEMENT
GEARING
EXHAUST
CAM SPEC'S
POWER

Take a look and play with this, I have had a lot of fun with this one!