not really....The lower gear takes more power to turn. I have'nt dynoed it with the 3.90's, that 413 dyno was with 4.11's. It could dyno a little higher now. I already stated the clutch did'nt do much on the dyno, but it does rev alot quicker.

 

Any pics of your HD 2500 with those hummer wheels on her?

 

Here's a few

 

lol at this thread.. i dyno'd low at 349 on a dyno jet, its just a #

OP. sounds bad ***... IMO Corsa's sound like *** with out headers in front of them

 

Thank you, you dyno'd 349 w/ tune or w/o?

 

the f body drivetrain and electric water pump will free up some power over the same set up in cts-v or gto.

GM high tech performance tested a stock ls1 on engine dyno with stock cam, ls6 intake, 241 heads, electric water pump, and long tubes and it made over 415. of course electric water pump and no accessories helped a lot.