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02-08-2025, 09:57 PM
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#1 |
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Active Member
 
Join Date: Jan 2025
Location: Clarkdale, Arizona in a van down by the river
Posts: 140
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Do these codes on the FW mean anything?
My truck has these numbers and codes written on the firewall. Do they mean anything or was this someone trying to mimic or reproduce the factory mfg codes used in mfg.
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'72 C10 / 402 ___________________________________________ Freedom isn't safe, it requires you to take responsibility for your own life, your own safety, and your own success. It carries with it the possibility of failure and the understanding that you're working without out a safety net. If you give the state the responsibility for any of these you also give up the freedom that accompanies the responsibility. |
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02-08-2025, 10:40 PM
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#2 |
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Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,841
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Re: Do these codes on the FW mean anything?
L47 is your engine- 400 CI
M49 is your trans- 400 THM, I'm sure J70 is power brakes, which were an option on 1/2T trucks CE10934, see the chart These were aids for the people on the assembly line for picking the components.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA Last edited by Steeveedee; 02-08-2025 at 10:45 PM. |
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02-09-2025, 01:57 AM
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#3 |
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All about them K’s
 
Join Date: Jun 2014
Location: Land of Entrapment
Posts: 6,553
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Re: Do these codes on the FW mean anything?
Is your truck a St. Louis build? I’d bet it is. They were famous for tatting up the firewall with assembly/option codes.
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Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne: 5” lift, 35’s, front dana 60 blah blah blah… http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB: 4” lift 33”s… in a million pieces http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 35x12.5x20’s |
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02-09-2025, 08:06 AM
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#4 |
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All stock and staying that way
 
Join Date: Jul 2003
Location: Elkland, PA
Posts: 1,990
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Re: Do these codes on the FW mean anything?
My St. Louis built 1970 Blazer had all sorts of tats on it's firewall. I replicated these during the resto.
PT- ? Z84 - CST trim package KE10514 - 4WD V8 Blazer 104" WB LS9 - 350 4 BBL V8 J70 - Power Brakes M20 - 4 speed manual trans
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1970 K/5 Blazer CST 4WD, TOTM winner December 2024! Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD Kelsey Hayes wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion..  1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor...  2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels |
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Yesterday, 11:55 AM
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#5 |
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Registered User
Join Date: May 2009
Location: Motor City
Posts: 9,261
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Re: Do these codes on the FW mean anything?
Grease pencil markings:
http://67-72chevytrucks.com/vboard/s...light=sequence http://67-72chevytrucks.com/vboard/s...light=graffiti http://67-72chevytrucks.com/vboard/s...light=graffiti http://67-72chevytrucks.com/vboard/s...light=graffiti http://67-72chevytrucks.com/vboard/s...light=graffiti http://67-72chevytrucks.com/vboard/s...d.php?t=545345 http://67-72chevytrucks.com/vboard/s....php?p=6543084 K
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Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ Last edited by Keith Seymore; Yesterday at 01:30 PM. |
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