check this out (ls1 guys)
 

http://www.edelbrock.com/automotive_...lvetrain.shtml

foud this link from mustang forum no tune needed thats gotta be B/S

Its the friggen LSXs, they be touched by god.

lol i would say thats measured at the flywheel. still a pretty decent gain i guess.

not to come off bragging, but my untuned bolt on 6spd put down 342hp/362tq to the wheels. given a 15% parasitic drivetrain loss its roughly 402hp/425tq @ the flywheel.

Yea it's flywheel horsepower. Most bolt-on cars wouldn't even notice a difference. Here's a thread on tech about it: http://ls1tech.com/forums/showthread.php?t=918597

Def flywheel HP...know how I know?

Duration @ 0.050"
207° I / 220°

LSA = 118

Why even waste the time? :-?