Just FYI for you board members. Here is what I have.

Dyno results yesterday:
379.42 RWHP
395.3 RWTQ



Stock 2003 LQ4 6.0l
milled heads .030 and reassmbled with new stock GM gaskets and head bolts
C5 manifolds into 2.5 Y-pipe and 3" single ehaust with a huge (quite) Magniflow RV series muffler.
Stock intake, TB, and MAF (descreened)
'01 LS6 cam/springs
LS1 electric fans
ASP underdrive pully
little bitty K&N filter (3" compared to the 4" MAF inlet)
custom wiring harness to fit my truck (1968 C10)
F-body PCM
NO EGR crap
Aeromotive fuel pump and regulator
stock injectors and rails


T56 tranny
12 Bolt with posi and 3.42 gears
Running 295.50R15's

 

Sounds a bit high. You say this was transplanted into a different vehicle? Also what cam is in there?

 

That's threw a T56 also which will show higher dyno numbers. Still seems a bit high, I think in the trucks the 6.0Ls dyno in the 290rwhp range.

 

Wow.

Stock LQ4 = 325 HP x ~17% drivetrain loss (auto) = ~270 RWHP
Stock LQ4 = 325 HP x ~12% drivetrain loss (man) = ~286 RWHP
You report ~380 RWHP

So you got ~100+ RWHP from those mods, that's amazing.

EDIT: Corrected numbers for LQ4

 

oops sorry 2001 LS6 cam/springs and LS1 fans.

The numbers are great. Hence the title "underated?".

Motor is in a 68 chevy pu.

Might seem high but it's still a fact

 

I've hear my numbers are low, but, stock I saw 222rwhp. with the whipple and a bad, bad tune I only saw 290.

 

Stock LQ4 = 320hp
Stock LQ9 = 345hp

 

Cam and Manual tranz really help out though. Not unbelievable though.

 

Actually, I think we're both wrong....the LQ4 has 325 HP at the flywheel. Doh! But you are correct, it's the LQ9 that has 345.