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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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19K
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1.2K
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Dual Plane MPFI Manifold
47 minutes ago
L31MaxExpress
LSX + Carb Swaps
This section is for info on LSX or carburetor swaps into the OBS trucks.
Threads
633
Messages
7.9K
Threads
633
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7.9K
Carb swap wiring help.
Yesterday at 2:08 PM
DemonDuallie
Exhaust
Anything exhaust - from headers cats and pipes to tips.
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13.9K
Threads
1.1K
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13.9K
New Y-pipe and cat for the old girl
34 minutes ago
someotherguy
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The Stupid Engine Questions Thread
Mike
Dec 3, 2009
207
208
209
Replies
2K
Views
369K
Sunday at 4:14 PM
FighterOfTheFoo
Sticky
GMT400 - Community Scan Tool
studigggs
Jan 9, 2023
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32
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312
Views
32K
Apr 22, 2024
Blue Max
B
Sticky
88-98 Service Manuals
hatzie
Dec 15, 2018
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15
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144
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243K
Apr 20, 2024
BeautyandtheBeast
Sticky
Let's get connected!!!
Scooterwrench
Oct 1, 2023
4
5
6
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59
Views
6K
Apr 1, 2024
Scooterwrench
Sticky
How to Put a Vortec Motor in a TBI Truck
Erik the Awful
Jun 17, 2020
10
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12
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113
Views
74K
Mar 26, 2024
rebelyell
R
Sticky
TBI small block intake gasket replacement (PIC HEAVY)
someotherguy
Dec 25, 2022
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4
5
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41
Views
13K
Feb 16, 2024
95OBSMan
Sticky
Engine Oil Cooler Upgrade: Add 2 quarts! (SAS guys you'll want to see this)
88GMCtruck
Apr 14, 2010
2
3
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28
Views
73K
Dec 27, 2023
pgutier1
Sticky
How to MarkVIII your OBS on a budget..!
monstar_est87
Apr 30, 2012
16
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18
Replies
171
Views
145K
Sep 23, 2023
Casey916
Sticky
Putting A Chip In A TBI Truck
Bighead38
Dec 3, 2009
19
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21
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202
Views
295K
Jul 10, 2023
mwilliams55555
Sticky
Maintenance: RPO Code Database & Decoder
Greg
Dec 4, 2009
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4
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33
Views
49K
Jul 3, 2023
GoToGuy
Sticky
How to Replace oil filter adapter gasket & o-ring
Hodges87
Dec 14, 2009
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6
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55
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159K
Jun 20, 2023
Illbedipped
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Sticky
The Ultimate 88-98 Performance Toolbox
Devs93
Aug 1, 2012
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35
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249K
Mar 12, 2023
jpcedotal
Sticky
GMT400 History
Greg
Mar 16, 2010
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25
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245
Views
327K
Feb 27, 2023
Will Fuller
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Sticky
Intake Gasket Replacement
Ginger
Dec 4, 2009
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124
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120K
Dec 9, 2022
mary7654
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Sticky
Tune Up Parts Numbers
supjim12
Dec 22, 2009
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37
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65K
May 15, 2022
Erik the Awful
S
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ULTIMATE TBI mods stage 1
shelbyt.67
Jun 28, 2012
26
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273
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328K
May 5, 2022
PlayingWithTBI
Sticky
Water Pump Relacement
Ginger
Dec 4, 2009
7
8
9
Replies
86
Views
85K
Jun 7, 2021
HotWheelsBurban
'93 K3500, 454 TBI, poor drivability
Idaho83815
Saturday at 3:09 PM
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3
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21
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458
2 minutes ago
Idaho83815
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Bad running after manual swap
JPVortex
Apr 17, 2024
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109
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3K
2 minutes ago
1998_K1500_Sub
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Where to buy 94 5.7 TBI Intake Manifold studs or studded bolts?
indexcow
Yesterday at 12:12 PM
Replies
5
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105
28 minutes ago
someotherguy
PSA: 1988-1995 stumble after EGR valve replacement
Tucano396
Feb 25, 2023
Replies
3
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2K
28 minutes ago
someotherguy
H
TBI flooding when on a full tank
highrpmsbc
Yesterday at 11:00 PM
Replies
1
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58
42 minutes ago
someotherguy
383 Build
BigIron002
Sunday at 7:07 PM
2
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18
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461
Yesterday at 11:27 PM
BigIron002
Knock sensor issues
Parking lot mechanic
Yesterday at 9:03 PM
Replies
4
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95
Yesterday at 11:07 PM
Parking lot mechanic
4.3 v6 knock sensor issues after swap
Parking lot mechanic
Apr 24, 2024
Replies
6
Views
184
Yesterday at 10:52 PM
Parking lot mechanic
B
Best Plugs to Run with Shorty Headers?
BMiller85
Apr 11, 2024
2
Replies
15
Views
568
Yesterday at 10:27 PM
Suburbarn
S
I need mental help!!! What should I do?
Maddmatt
Apr 23, 2024
2
3
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20
Views
833
Yesterday at 10:15 PM
Maddmatt
H
Diagnosing lean fuel air mixture/mysterious PCV line, '97 5.7 Suburban
hickoryballz
Yesterday at 3:11 PM
Replies
4
Views
97
Yesterday at 8:15 PM
east302
K
Oil Priming on L31 Vortec
katwood16
Monday at 10:37 PM
2
Replies
16
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310
Yesterday at 7:50 PM
Frank Enstein
Fuel Quality!
Scooterwrench
Apr 16, 2024
4
5
6
Replies
58
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2K
Yesterday at 7:28 PM
Scooterwrench
Fuel pressure issues
thatguyHoBo
Monday at 8:35 PM
Replies
8
Views
215
Yesterday at 6:45 PM
thatguyHoBo
5.7 TBI to 5.3 LM7
D-Day
Feb 26, 2024
Replies
9
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596
Yesterday at 6:36 PM
Schurkey
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'93 K3500, 454 TBI, poor drivability
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