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Engine Performance + Maintenance
If it's under the hood, its in here.
96+ Vortec Performance + Computer Swaps
If you want to do the 0411 PCM swap or have a 1996+ Vortec motor this is your forum!
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1997 5.7 vortec
Thursday at 3:10 PM
L31MaxExpress
LSX + Carb Swaps
This section is for info on LSX or carburetor swaps into the OBS trucks.
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723
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8.9K
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723
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8.9K
5.3 LS coolant in the oil
Tuesday at 4:52 AM
Schurkey
Exhaust
Anything exhaust - from headers cats and pipes to tips.
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15.5K
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Bent exhaust from clamp
Yesterday at 5:11 PM
Schurkey
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GMT400 - Community Scan Tool
studigggs
Jan 9, 2023
38
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40
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392
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57K
Yesterday at 3:14 PM
Rocky1228
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Sticky
88-98 Service Manuals
hatzie
Dec 15, 2018
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38
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391K
Tuesday at 7:10 AM
Doskiie
Sticky
The Stupid Engine Questions Thread
Mike
Dec 3, 2009
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2K
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434K
Monday at 2:47 PM
Real12Monkeys
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OBDI tuning and scanning supplies
Scooterwrench
Dec 28, 2024
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7
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65
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7K
Apr 29, 2025
scott2093
Sticky
How to Replace oil filter adapter gasket & o-ring
Hodges87
Dec 14, 2009
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6
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59
Views
171K
Apr 11, 2025
Schurkey
Sticky
How to Put a Vortec Motor in a TBI Truck
Erik the Awful
Jun 17, 2020
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154
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110K
Mar 11, 2025
Majoraslayer
Sticky
TBI small block intake gasket replacement (PIC HEAVY)
someotherguy
Dec 25, 2022
3
4
5
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47
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25K
Dec 28, 2024
scott2093
S
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ULTIMATE TBI mods stage 1
shelbyt.67
Jun 28, 2012
27
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29
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282
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354K
Dec 8, 2024
PlayingWithTBI
Sticky
Intake Gasket Replacement
Ginger
Dec 4, 2009
11
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125
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133K
Dec 7, 2024
rebelyell
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Putting A Chip In A TBI Truck
Bighead38
Dec 3, 2009
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213
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322K
Oct 4, 2024
PlayingWithTBI
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How to MarkVIII your OBS on a budget..!
monstar_est87
Apr 30, 2012
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186
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155K
Oct 1, 2024
SAATR
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Engine Oil Cooler Upgrade: Add 2 quarts! (SAS guys you'll want to see this)
88GMCtruck
Apr 14, 2010
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79K
Aug 24, 2024
L31MaxExpress
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The Ultimate 88-98 Performance Toolbox
Devs93
Aug 1, 2012
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36
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278K
May 17, 2024
poncho98
Sticky
Water Pump Relacement
Ginger
Dec 4, 2009
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87
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93K
May 13, 2024
Utah York
Sticky
Let's get connected!!!
Scooterwrench
Oct 1, 2023
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59
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10K
Apr 1, 2024
Scooterwrench
Sticky
Maintenance: RPO Code Database & Decoder
Greg
Dec 4, 2009
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33
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55K
Jul 3, 2023
GoToGuy
Sticky
GMT400 History
Greg
Mar 16, 2010
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245
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354K
Feb 27, 2023
Will Fuller
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Tune Up Parts Numbers
supjim12
Dec 22, 2009
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37
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70K
May 15, 2022
Erik the Awful
S
A/C accumulator question
smdk2500
Jul 21, 2018
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26
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12K
10 minutes ago
Carlosthehandyman
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A/C help
what Did I buy this
Jun 12, 2025
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28
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1K
31 minutes ago
Carlosthehandyman
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Engine code help
TruckLover
Today at 8:54 AM
Replies
1
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26
Today at 9:32 AM
someotherguy
1994 k1500 5.7 idle performamce issue
wilkersonj
May 30, 2025
2
3
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22
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608
Today at 8:29 AM
scott2093
Tunerpro log - rough cold start 1995 7.4L
termite
Feb 6, 2024
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48
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5K
Yesterday at 10:53 PM
termite
97 6.5. No fuel to injectors
RyleeBoh
Jun 7, 2025
2
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12
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219
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smdk2500
S
P
Godforsaken Rattling
patkelty2
Yesterday at 10:16 AM
Replies
3
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81
Yesterday at 9:02 PM
Schurkey
Hard Start in cold
paylov
Nov 13, 2023
Replies
4
Views
3K
Yesterday at 9:00 PM
Schurkey
Tbi rough cold starts
JPVortex
Feb 2, 2024
2
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37
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14K
Yesterday at 8:49 PM
Wolvrine82
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Stumble after cold start
Redsled
Jan 16, 2024
2
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12
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3K
Yesterday at 8:01 PM
GMCTruck
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My truck is shuttering/hesitation at semi randon times.
Scaper
Yesterday at 3:42 PM
Replies
1
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43
Yesterday at 5:15 PM
Schurkey
AC rebuild parts list
rob249
Jun 7, 2025
2
3
4
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38
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721
Yesterday at 3:24 PM
rob249
A
Cold start problems with 1992 GMC 5.7 liter
Anchor
Mar 30, 2024
2
Replies
10
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2K
Yesterday at 2:28 PM
daleoshak
D
M
Update 95 z71 5.7 4L60 swap to 7.4 4L80
Moofus02
Jun 4, 2025
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33
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839
Yesterday at 1:36 PM
Moofus02
M
Whipple Supercharged 7.4L Suburban on the Dyno
reversion_raceworks
Apr 9, 2025
2
3
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26
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2K
Yesterday at 10:34 AM
Moofus02
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