h_friesen

iTrader: (42)

Took my truck to the shop and dynoed 400 hp and 368 tq at the wheels with this setup:
6.0 with stock pistons, P&P L92 heads, 229/236 .624/615 TSP LS3 cam, Longtube headers, 3" y-pipe, Cold Air Intake, Vigilante 3200 triple disc stall. Something doesnt seem right here, or am i just expecting to much from this setup? I realize that with a 22-24% loss through the tranny i'd be making between 488-496 hp at the crank. or is this right where it needs to be?

69LT1Bird

iTrader: (1)

more like 15-18% loss

What intake are you using?
Which 6.0? LQ4 or LQ9?
Are the heads milled?
Stock head gaskets?

Sales4@Texas-Speed

iTrader: (4)

Is there anyway to get a graph posted? I would also like to know the compression on the motor.

h_friesen

iTrader: (42)

I will try to get one posted asap.
I think it is an LQ4 (2004 6.0) dont know when LQ9 came out
Stock MLS gaskets .051 compressed
70cc chambers stock, didnt asked for milling whenever i ordered the heads so i think there still at 70 right John?

Jon@Texas-Speed

iTrader: (18)

It doesn't have much compression w/ that setup. You have a dished piston and a big chamber head. That would be the first place I would start looking. However, w/ the big valve on the intake, you aren't going to have a ton of room to mill w/out flycutting.

Jon

Sales2@Texas-speed

iTrader: (5)

I think 20% or even a bit more loss through that stall and drivetrain and VERY feasible!

h_friesen

iTrader: (42)

Jon, i believe your right 20 or a bit more according to Jason, and yeah i dont have very much compression to begin with, is this what is hurting my low end? I will try to post a dyno sheet tonight

WKMCD

iTrader: (2)

The L92 heads like as much compression as you can run AND still run 28-30 degrees of timing before KR.

As people said, probably low compression. How much spark lead are you running?

h_friesen

iTrader: (42)

yeah i think your right on that stock lq4 its 9.4:1 i would like it to be 10.1:1 and i dont know how much spark lead, i got it dynoed at Texas Speed, they have done all my tuning

ws6killer

iTrader: (4)

Did they ever lock the convertor up for a pull? With that stall I'm guessing 24% easy on drivetrain loss!

h_friesen

iTrader: (42)

yeah i think it did lock for the pull, it is a triple disc is ought have

ws6killer

iTrader: (4)

Don't get to discouraged man. Those numbers are about right for the low compression! Get those heads milled and it will jump up alot!!

laytoncamaroz28

iTrader: (10)

Told ya buddy lets yank those heads off and mill em!!

h_friesen

iTrader: (42)

how much would you recommend to mill? .030 or more? and what would that leave me with 10:1 or at least close??

h_friesen

iTrader: (42)

or just leave em and consider it setup for a lotta boost?! would prefer to be all motor...

69LT1Bird

iTrader: (1)

I took .030 off mine they came out to 62cc's

Piston above deck .010, like most LQ4's
Stock pistons are 6.7cc dish
Stock L92 head gasket .052 thickness, 4.065 bore
Stock 4.00 bore
Stock stroke
Every calculator shows 10.6:1

Here is a good calculator
CR calculator

h_friesen

iTrader: (42)

well according to that c/r calculator and your info i have a ratio of 10.172:1

BLK02WS6

iTrader: (2)

Leave the heads alone and replace that intake with a Maggie

h_friesen

iTrader: (42)

That's a good thought! I'm going to try different rear end gears before i start pulling my engine apart

Clean94Z

iTrader: (5)

here is a thread i did when i flycut the pistons on my 6.0. Get hold of spinmonster on the corvette forums. He has the tool/head setup already and rents it for $150.00 It was very easy and didnt take alot of time. Hope this helps.

http://forums.corvetteforum.com/c6-t...ght-tools.html