That's like all these new cars and their hp ratings, people don't always realize that they are advertising flywheel hp, not at the wheels. The new v6 Camaro sounds impressive at 303hp but when you are only putting 250 at most to the rear wheels, not bad for a v6 but certainly not a true 303hp.

The local Corvette club just had a big car show here in DeLand, FL. Any Vette to show up received 3 chassis dyno pulls for free. Let me tell you, there were some VERY upset Vette owners. To the point where a couple of them left the show and were ticked off at the guys running it claiming their Dyno was "off", broken etc.

They ran a ZR1 (supposed "625HP") and it pulled 470 at the rear wheels and the torque didn't even hit 500. So yes Dyno pulls can vary and most often leave the owners scratching their heads.

My 461 stroker as explained to me by my engine builder and Butler Performance is "guranteed" to put 425hp to the rear wheels and around 600lbs of torque on a chassis dyno. Hopefully I will be able to see this for myself unless of course I have to sell it off before firing it...