You mean like desktop dyno 2000? (motion software)
A guy on the Monte Carlo list I am on put his specs from his 12.5 car into that program, and estimating the HP/Torque from his track runs, he determined that it was VERY close to what his engine was making. The software is missing a few inputs, such as roller rockers, and is overly favorable towards roller cams, stretching their gains into the "thats nowhere near accurate" level.
Dorian
My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://yeagerd.home.mindspring.com/index2.html>http://yeagerd.home.mindspring.com/index2.html</A>