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2003 GMC Duramax 6.6L LB7

TheBac’s Diesel Place : Chevrolet and GMC Diesel Truck Forums Garage
2003 GMC Duramax 6.6L LB7
-- the original LB7 is now an "LB7-Z"
-- Cut LB7 pistons
-- LBZ rods
-- fresh LB7 heads
-- rebuilt it myself in my garage with my son's help, Jan-June 2010, after bending the stock rods in 2009

-- Stock IHI -- seriously, it hasnt been touched
-- Profab custom inlet
-- Stock wastegate with PPE boost valve
-- Profab manifolds and uppipes

Fuel & Tuning:

-- EFI Live - started with the "12.40" tune that Nick @ DuramaxTuner wrote for me and I've modified it to suit the truck as I've gone along.
-- FASS 150 lift pump

-- Superdiesel modded LB7 regulator and gearpump
-- 30% injectors by Precision Diesel Injection

Exhaust and other underhood mods:
-- S&B intake
-- Silverline T304 single exhaust
-- NAPA batteries
-- Merchant/Kennedy high idle mod

-- Merchant Stage 3 trans
-- Precision "MikeL" converter
-- Merchant T-case
-- Suncoast T-case brace

Suspension, wheels & tires:
-- 265/70/17 Hankook DynaPro ATM RT10 on stock 2008 GMC 17" wheels
-- 275/70/16 Toyo Proxes on PY0s for racing
-- QA1 adjustable front shocks for racing
-- Bilstein shocks for DD
-- Cognito Idler/Pittman braces
-- Tie Rod Sleeves
-- Caltracs

-- My Cabin Filter Kit
-- Footwell lighting
-- LUX amp/Touchscreen Nav/CDX
-- Denali dash and switch panels
-- Denali console
-- Autometer Digital Sport-Comp Boost and EGT gauges
-- Katzkin Smoke-colored seat covers
-- Dark grey carpet from StockInteriors.com

-- Ventshades
-- All-headlight-on mod
-- GM chrome step bars
-- Truxedo tonneau
-- Chrome handles in stock black buckets
-- VR Straps
-- 2003 Silverado taillights

Power Progressions:
Dyno'd 498hp/931tq at Merchant's Spring Fling, 2007, Dave Dunbar's dyno

Dyno'd 511hp/999tq at Merchant's Spring Fling, 2008, Dunbar's
Dyno'd 578hp/1152tq at Danville Performance 6/23/09
-- yes I have the slips to prove it.

ET/MPH Progressions:
13.19 @ 103.01 -- Stanton 08/01/07
12.95 @ 105.67 -- Stanton 09/26/07

12.93 @ 104.88
-- Stanton 10/22/07
12.77 @ 105.61 -- Milan 9/19/08
12.70 @ 107.06 -- Stanton 10/5/08
12.63 @ 106.79 -- Stanton 10/12/08
12.40 @ 108.00 -- Stanton 10/19/08
12.28 @ 108.52 -- Stanton 10/11/09
12.22 @ 110.59 -- Stanton 9/19/10
12.14 @ 111.15 -- Stanton 10/3/10

Decided to retire BBT from racing duty.

New plan is to build a 1/2 ton RC/SB with my current LB7/Allison combo.
"The Flying Brick" build began in April, 2013 but will proceed slowly as time and money permit.

Click Thumbnail to Enlarge.
Sleeper?  You decide. Pic taken the day after I got her home, July 2005 Looks stock, doesnt run that way.....LOL Getting ready for vacation Our 25' Jayco. The prototype of my Cabin Filter Kit, installed in my truck My Denali/Escalade Nav unit New chrome handles Pulling a broken Ford back to Cincinnati after Smokin' 2007 Eric Merchant's tire during his 760HP run at Smokin' 2007.  I love this pic. Pic taken day after I got her home, July 2005 Race ready.  Stanton 10/22/07 -- 12.93 @ 104.88!    EDIT:  was that really that long ago? Pulling at Merchant's Spring Fling 2007 New shoes!!! 285/70/17 Hankook RT10s on 2008 GMC wheels BBT in race trim ready to go, Sept 2010 Bringing the donor truck home (for the 1/2 ton project) More racing.
Gallery Statistics
Member: TheBac
Created: 05-26-2007 08:08 AM
Last Modified: 08-18-2014 01:25 AM
Views: 10576
Images: 18
Comments: 31

Author Comment Date
Robby Avery What do you use to clean under the hood? 05-09-2011
Brad92 Sweet truck. Glad its back up and running. 07-23-2010
carter_44 nice clean lb7. very solid hp numbers as well. 02-28-2010
TheBac Like it just fine! 09-23-2009
DAVe3283 Nice truck, love the color! How do you like the lux amp? 09-20-2009
rodder55 just curiuos what exactly is going in picture three whats with the mouth peice and six six thing also i love that color and very nice truck man 07-19-2009
TheBac Bought on Ebay. Plugs right in. Will need to be reprogrammed at dealer, though. 01-26-2009
nineball12 did you buy that denali/escilade nav unit from the dealer and does it just plug in 01-25-2009
WilsonFarms If you still have the cabin air filter kits, how do I go about getting one? 12-15-2008
YOLO nice rig! 10-30-2008
Jason Duramax Nice, nice rig. And your posts make sense too. 10-22-2008
TheBac With a high-hp tune? Usually averages 19-20 highway, 16-17mpg overall..sometimes dips to 15. I have a very heavy right foot. 10-21-2008
BIGR Nice looking powerhouse you have there. Just curious what your fuel mileage is when you drive it as a daily driver? 10-19-2008
TheBac No you didnt, but thanks for the compliment! 07-08-2008
DURAtotheMAX Tom did I tell you at spring fling that I want your tire/wheel combo?? 07-05-2008
TheBac I like the trans. I have not had any issues with it. 06-18-2008
TheBac yes, I have cabin filter kits. I'm not a vendor any more, though. Been thinking of taking them to Ebay. 06-18-2008
06dmaxdriver how do you like the trans 06-18-2008
WilsonFarms I have an '06 lly, do you have a retrofit cabin air filter? How difficult is it to install? 06-06-2008
TheBac Thanks for the comments! Its been a great truck so far. 03-26-2008
serge nice truck! looks like it got a beast under that hood 03-26-2008
TIM Z Wow, great E T's , Man that truck hauls! 03-19-2008
07BlackSilveradoHD GOT TORQUE?? I'd say, look at that tire. 01-16-2008
TheBac The tire shot is of Merchant's truck at Smokin' 2007. His truck put out 760hp at that event. 01-03-2008
Duratys Love the tire shot Tom That blue looks sweet!! 01-03-2008
ripmf666 Nice pics Tom 12-26-2007
jbbuher so, 12.95 with just ppe hot 2 and a stage 3? thats it...if great! 10-06-2007
Yaz Nice job Tom on your times! Slick truck as well. Thanks for all you help on this site. 09-27-2007
TIM Z Sweet truck bud, The MA STG III is awesome!!!!! 07-17-2007
Unit453 Great numbers there Tom...Your truck looked great on that dyno...! It was also great to meet you finally... 07-07-2007
paul1987 Nicre shot of Eric's tire. didn't know he had wrinklewalls. 06-19-2007
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