How much HP would you guess my 340 produces?

furrystump said
There must be a track near you. Weigh it, run it and plug the mph into the calculator. Get you close enough. Dyno’s can be stingy or very happy. Track is brutally honest. My car chassis dyno’ed at 343 RWHP and weighs 3445 with me in it. The calculators put me at 430 RWHP at 3445 lbs and 117 mph. I dyno’ed it for the shape of the curve and where. Not the number.
Click to expand...

People get lost in dyno numbers and lose sight that it's just a tool, just like a timing light or a tire pressure gauge. If your engine doesn't the power it should for the sum of the parts do some investigating to find out why. It's easier on a dyno than in a car.