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Print in friendly format Send this term to a friend  Regular Production Order
Commonly known as RPO. These are the codes that GM uses to identify options.

For example, LT1 is the RPO for the engine used from 1992-1996.

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C4: 1984-1996  > C4 Technical
(1) 2 3 4 ... 105 »
   Topics Replies Views Last Post
The topic has been Stickyed. C4 Technical FAQ and Summary
 by bogus
24 57904 2015/2/5 17:16
by CentralCoaster
The topic has been Stickyed. How to check diagnostic trouble codes (DTCs) or diagnose service engine soon (SES) light.
 by Matatk
5 17386 2014/10/13 19:23
by BrianCunningham
The topic has been Stickyed. Pete's Transmission Threads
 by bogus
20 16469 2014/8/5 15:13
by bogus
The topic has been Stickyed. [Announcement] Guru Tech Library
 by bogus
9 10625 2013/12/21 17:39
by Matatk
The topic has been Stickyed. Trouble codes. Topic has Attachments
 by captmike13
12 16014 2013/6/10 22:03
by bogus
The topic has been Stickyed. C4 Common Part Numbers Topic has Attachments
 by Matatk
17 24123 2012/9/2 18:42
by Matatk
The topic has been Stickyed. C4 Tech - Corvette Publications
 by bastet44
8 10725 2010/9/3 21:35
by biggrizzly
The topic has been Stickyed. LT1 Scan/Tune FAQ Topic has Attachments
 by vis_croceus
23 49917 2010/8/11 17:40
by bogus
Kent-Moore J35890 Instruction Manual?
 by hcbph
4 62 11/16 13:27
by Matatk
Cooling question
 by CorvetteBob
2 34 11/16 7:58
by CorvetteBob
Window switch done
 by hcbph
2 157 11/1 1:08
by hcbph
89 vette misfires when at operating temperature
 by damien89
1 67 10/27 14:32
by Matatk
Seat Foam replacement tip
 by hcbph
1 68 10/25 14:11
by TommyT-Bone
Checked your radiator lately?
 by hcbph
8 972 9/22 22:24
by bogus
FSM confusion
 by joeld
19 2186 8/8 6:23
by Matatk
Seat Belt Locked up on 87
 by lunytnz
8 825 7/7 22:24
by bogus
Wednesday Chat 06.19.19
 by Matatk
14 390 6/20 0:27
by j3studio
Fiberglass repair Topic has Attachments
 by istter1
6 405 6/19 6:03
by Matatk
Dies at throttle off
 by lunytnz
3 216 6/18 13:40
by bogus
Want to paint my c4 under $2000. /any ideas Topic has Attachments
 by istter1
11 1071 6/5 13:43
by bogus
how do you fix a seat belt retractor that gets tighter and tighter
 by iCorvette
15 6055 5/15 2:25
by bogus
RADIO
 by GRIS
4 400 1/9 0:50
by GRIS
Group 75 AGM
 by vis_croceus
2 2383 12/24 3:11
by bogus
86-89 Digital Instrument Cluster "OD" light Topic has Attachments
 by Woodstock
24 6408 11/30 5:17
by Matatk
Who likes engine porn?   [1][2]
 by 383tpimachine
95 41157 2018/11/1 19:29
by 383tpimachine
Changing gauges in an L98 C4
 by bearcat
5 932 2018/10/8 2:21
by -=Jeff=-
[Wack j3studio Question #65] Cigarette Lighter Has Power, But Doesn't Hold-in/Pop
 by j3studio
13 1465 2018/9/6 14:54
by j3studio
Brake Presssure light
 by BrianCunningham
3 455 2018/8/26 23:14
by BrianCunningham
August 11th, how to spend your saturday night. Topic has Attachments
 by hcbph
12 1171 2018/8/22 0:32
by hcbph
Anybody need a, um, planter? Topic has Attachments
 by vis_croceus
7 673 2018/8/2 23:24
by Eagle223usa
THINKING AHEAD
 by GRIS
5 718 2018/7/11 13:44
by Ultraman
Stick shift Problem with 1990 zr-1
 by ConcreteMan
5 624 2018/6/25 14:09
by -=Jeff=-
Had to do an alternator
 by hcbph
10 1009 2018/6/24 10:17
by hcbph
Need new rotors: slotted?
 by lunytnz
4 486 2018/6/18 14:51
by lunytnz
NOTHING IMPORTANT
 by GRIS
3 447 2018/6/17 0:35
by bogus
OP switch behind intake manifold
 by CorvetteBob
13 1313 2018/4/21 2:07
by CorvetteBob
1995 rough idle at a stop
 by Fletcher
14 1786 2018/3/30 6:32
by bogus
Fuel Pressure Regulator -L98
 by joeld
2 470 2018/3/16 15:22
by Matatk
1989 L98 Engine rebuild - Part 2: prep and install Topic has Attachments   [1][2]
 by Matatk
77 44287 2018/3/13 2:57
by Joes1stC4
Rear hub teflon washers. Topic has Attachments
 by hcbph
8 897 2018/3/10 20:40
by hcbph
Looking at new rims
 by CorvetteBob
10 1133 2018/1/31 14:37
by bogus
c4 stuff
 by pappyfreebird
5 717 2018/1/28 1:47
by pappyfreebird
Buying a C4
 by garyla
7 879 2018/1/27 23:02
by bogus
Heater Core Removal and Replacement - 1989
 by Matatk
12 13003 2018/1/23 6:44
by Matatk
Torque Thrust Wheels for 1987 Coupe
 by Kckckc
2 526 2018/1/7 21:23
by bogus
Replaced straight pipe exhaust to magnaflow c4 1988 now running rough
 by Barney
3 835 2017/11/13 19:53
by Barney
Early C4 ABS Parts Topic has Attachments
 by hcbph
15 3837 2017/11/7 11:15
by hcbph
AFR heads and headers?
 by CorvetteBob
12 3005 2017/10/23 2:44
by Matatk
Now that I have a radiator...
 by CorvetteBob
5 1235 2017/10/22 14:45
by CorvetteBob
auxiliary fuse box c4 1991 Topic has Attachments
 by corvettec4eosg
5 759 2017/10/12 19:46
by bogus
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Topic has a Poll = Topic has a Poll
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