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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 ... 9 10 11 (12) 13 14 15 ... 105 »
   Topics Replies Views Last Post
Stronger clutch
 by istter1
23 6758 2013/9/15 21:16
by istter1
Building a boost friendly 400 Topic has Attachments
 by 383tpimachine
23 10223 2014/9/12 13:05
by 383tpimachine
Fron spring question
 by CorvetteBob
23 6712 2014/3/27 16:37
by CorvetteBob
Continuation of ECM diagnosis in regard to No communication with ECM through datalink with chip inst
 by Danspeed1
23 9912 2016/9/16 17:33
by Danspeed1
2 quiestions
 by NC Kid
22 8402 2007/12/26 2:28
by CasetheCorvetteman
Porting pics for you guys..
 by cuisinartvette
22 5828 2008/1/10 16:16
by JrRifleCoach
UPDATE: Steering Column tilt pin repair
 by Steve40th
22 9951 2008/2/23 6:04
by Ramrod
which diff ratio to buy please ??
 by c4-zo7-91
22 4948 2008/2/16 3:17
by c4-zo7-91
95 PCM in a 96
 by MK 82
22 6795 2008/2/13 6:26
by CasetheCorvetteman
4+3 transmission (edit)
 by brian
22 6518 2008/3/24 22:57
by pappyfreebird
How to get the crank hub back on.
 by Travis93
22 8630 2008/3/16 1:06
by Travis93
84 auto corvette wont start.
 by scooter18155
22 20421 2008/5/6 3:35
by scooter18155
L98 running cold with 195 stat
 by Gearheadotaku
22 11225 2008/8/4 20:28
by Gearheadotaku
SAMCO Coolant hoses? Worth the money
 by biggrizzly
22 6631 2008/7/10 22:26
by Jeffvette
$90 new OEM Opti on eBay?
 by tobijohn
22 7800 2008/10/25 11:39
by biggrizzly
How much HP will I get by porting intake?
 by WW7
22 7195 2008/11/22 18:26
by BrianCunningham
1985 C4 driveline RWHP question - LS1 Swap Topic has Attachments
 by grind4it
22 6286 2009/2/12 0:45
by CentralCoaster
How do you tell if a wheel bearing is bad?
 by skirlin
22 9596 2009/3/20 20:12
by CentralCoaster
Need Help Quick Stuck Lifters!
 by rickreeves1
22 6619 2009/3/1 4:03
by Jeffvette
lt1 exhaust
 by tjpreul
22 10761 2009/4/1 21:48
by rklessdriver
Rocker help
 by Travis93
22 6500 2009/6/18 19:33
by dan0617
hood release Topic has Attachments
 by flyboy
22 10640 2009/5/16 2:29
by TommyT-Bone
Pulling LTx engine, need the definitive word
 by pianoguy
22 4905 2009/6/17 20:14
by Josh
Bad optispark always give a code?
 by Travis93
22 13429 2009/6/12 22:24
by Travis93
Progress on temperature Topic has Attachments
 by DaleD
22 6522 2009/6/12 19:41
by Matatk
cooling fans not working Topic has Attachments
 by patgizz
22 13933 2009/8/15 1:39
by patgizz
Worried after my oil change. [help!]
 by Matatk
22 9099 2009/8/6 17:57
by Matatk
Best Battery period end ? Topic has Attachments
 by BeachBum
22 8492 2009/9/6 18:32
by bogus
383/DMF considerations
 by 89Vette
22 11327 2009/11/20 22:54
by rklessdriver
Oh shite - here is another danm long tube thread
 by corvetteronw
22 11325 2009/11/20 5:18
by bogus
Banski MotorSports now has the Hardbar pintop shock mounts in a C4 specific kit
 by astock165
22 10396 2010/3/22 21:41
by Aboatguy
Hatch vent
 by corvetteronw
22 10608 2010/4/4 13:02
by flyboy
LT1 Oil Pans Suck Topic has Attachments
 by BillH
22 6004 2010/3/16 19:50
by BillH
Failed my smog inspection...
 by CentralCoaster
22 11883 2010/4/5 23:30
by flyboy
Big cams vs vacuum
 by sliding
22 14789 2010/7/19 3:06
by tpi421vett
Weatherstrip install for Roof and doors
 by Steve40th
22 12448 2010/8/22 16:52
by Steve40th
Anyone have powdercoated suspension parts?
 by Raidmagic
22 8526 2011/1/13 2:22
by CentralCoaster
[Announcement] 1992-1993 LT1 Owners - MUST READ
 by bogus
22 13381 2011/3/24 21:43
by bogus
90 C4 performance degrades the longer it runs
 by jwardg
22 8081 2011/11/10 12:30
by Matatk
Dead A/C Programmer Topic has Attachments
 by suecamaro
22 21451 2012/10/14 14:19
by Matatk
Rough start/Sometimes rough idle Topic has Attachments
 by Fredbird
22 10901 2011/7/8 19:14
by Fredbird
C4 Motor carnage (renamed) Topic has Attachments
 by SpectatorRacing
22 9011 2011/7/22 13:51
by SpectatorRacing
87 Vett Dash Pannel Kit Topic has Attachments
 by istter1
22 7686 2011/7/26 6:36
by istter1
1986 Crank but no start enigma
 by SpectatorRacing
22 11030 2011/8/5 18:41
by tequilaboy
autocross alignment done Topic has Attachments
 by BrianCunningham
22 9960 2011/11/27 19:54
by BrianCunningham
LT1 Bolt Ons
 by bogus
22 6725 2011/12/5 20:40
by bogus
87 MASTER CYLINDER OR SLAVE CYLINDER?? (new member) Help! Topic has Attachments
 by NorCalVette87
22 6557 2012/5/15 12:08
by istter1
Dead alternator
 by captmike13
22 5166 2012/3/12 18:39
by Matatk
Engine bracket photos for C4Williams Topic has Attachments
 by Matatk
22 10601 2012/7/13 17:50
by rayquayle
Post engine swap update #2
 by bogus
22 3737 2013/4/28 4:48
by bogus
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