Bob and Ken
These would be conservative manufacture numbers with smog pumps, cat converters stock cast iron manifolds on reg pump gas with a little bitty throttle body. They talked about 400HP race motors and my guess is that they would still be in a pretty mild state of tune compared to a circle track motor.
How many races can you run in 40 hours of track time before you ring and bearing it?? They didn't say anything about valves and springs the week link in to-days Midget Motors. How much over 400 Horse Power would one of these motors need to be competitive against a Modern 50 year old Midget motor built today??
Honest Dad himself