Marshall wrote
What doesn't make sense in this argument, to me at least, is how you can get
more HP from air alone and not air and fuel.
If there was not the accompanying fuel to accommodate the additional better
breathing from the big valve engine, - the van would be running lean, right?

So, if Boston Bob's van moves more air, it does seem to me that the AFM
would report this, and the ecu would increase the pulse length of the
injectors, to supply more fuel

Marshall
the big valve engine use's much less throttle to do the same job as Adam
reported in a prevois post
I hardly touch the pedal to go down the highway at 65 70
the engine is not lean because it was set up using an exhaust gas sniffer
it has an easier time doing the same work
Bob