In the last video above, the hood rises in the middle because of 4000 cfm air from the supercharger being released by the blowoff valves. Blow off valves release pressurized air when throttles are closed to prevent harm to supercharger impeller. These devices were not invented when we first ran centrifugal blowers [1989].
Later this week when Bvillercr comes out, we'll attempt to video the FAST. computer data showing the throttle position -shift points-rpm and time during our 280 21/4 and 294 1st timed mile run.
JL222