340 on dyno video, whats your opinion

Think of a weight lifter lifting weights. He can press, say, 300# maximum. He can press 100# quickly. Just give it a shove and up it goes. Does that mean all he can lift is 100#? Stress him with the 300# and how quickly does the weight go up? The 300# forces him to exert more power. It was there all the time at 100#. He just wasn't using it.

Mechanically load an engine on the dyno. Hear it begin to grunt and exert more power. The dyno is pushing back on the weight lifter and pushing him to his upper stress level. His 300# maximum.