340 on dyno video, whats your opinion

Sounds like a slow revving engine. Of course, the dyno was holding it back.
I'm not telling you anything you don't already know.....but for others...........

Good 'ol 'Nick' says he is running the dyno @ 300 rpm/sec acceleration rate. That makes the engine work harder.

I've been in dyno contests where some participants wanted to run at 600 rpm/sec so they wouldn't stress their engines too much. It lets the engine wind up quicker.

You what? Go to a dyno contest and don't want to "stress" your engine?

I guess you could run to 7,000 rpm @ 7,000 rpm/sec (basically no load) and stress your engine even less. You wouldn't make any horsepower though.

Ran a pump gas 451 on the dyno at 300 rpm/sec and it made 770 HP. At 600 rpm/sec it made 740 HP. That engine loved to be worked hard. Was 300 rpm/sec a 30 HP cheat? Not if the engine can pull it!

And you can load an engine so hard it won't accelerate on the dyno, it just stalls.