RPM .....Watch the throttle linkage near the end.. crank the speakers...
Wow! That thing sounds crazy. Is that an Atlas 4.2?
Yes it is. For sure it has some stout camshafts, compression and many hours at the tig and porting bench. Looks like they are running 3 holley 4500 series carbs. Thats a lot of air going through that motor.
I bet the thing hit at least 8000 rpm.