Radiator date codes? What does the tag stand for? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**tll74** · 03-12-2016, 12:35 AM

Ok guys what does this tag represent? I have these two rad's to have restored with a new core. I'm restoring a 71 Cheyenne Super with a 350 and would like to have a "correct" tag. Both of these rad's are 3 core A/T and are identical. Any info would be great!
Thanks, Tom

**tll74** · 03-12-2016, 01:33 PM

Somebody must know!

Livrat · 03-12-2016, 02:35 PM

Tom,
From my research I have found that the large font on the tag represents the "broadcast code" which was used on the assembly line to identify the radiator as a whole, I do believe this number should be on your build sheet.

The smaller fonts on the left identify the end tanks used in each particular application. the numbers below those identify the radiator core assembly,

Also if you wire brush the bottom lip you should be able to see the actual GM part number.

Here is a link that although it does not pertain to our trucks it will help explain the coding.
http://www.camaros.org/coolingsystems.shtml

swamp rat · 03-12-2016, 08:30 PM

Great information!

**geunther** · 03-13-2016, 10:12 AM

As stated, the IA and OK are tank codes. I believe the IA is the driver's side and the OK is passenger side. The tanks themselves should also have the same numbers stamped into them. Between the O and K should be a smaller letter date month code. Attached is mine as an example. I have not been able to locate the IA on the driver's side, which is a much smaller tank.

**tll74** · 03-16-2016, 10:31 PM

Livrat and geunther, Thanks! That's some good info. I'll look at my tanks. Unfortunately I don't have the build sheet on this truck. The seat was changed at sometime so the sheet is long gone.
Thanks, Tom

Keith Seymore · 03-17-2016, 07:01 AM

Quote:

Originally Posted by Livrat

Tom,
From my research I have found that the large font on the tag represents the "broadcast code" which was used on the assembly line to identify the radiator as a whole, I do believe this number should be on your build sheet.

The smaller fonts on the left identify the end tanks used in each particular application. the numbers below those identify the radiator core assembly,

You are absolutely correct.

K

03-12-2016, 12:35 AM	#1
tll74 "Junkyard Dog" Join Date: Jan 2008 Location: Springfield Oregon Posts: 2,527	Radiator date codes? What does the tag stand for? Ok guys what does this tag represent? I have these two rad's to have restored with a new core. I'm restoring a 71 Cheyenne Super with a 350 and would like to have a "correct" tag. Both of these rad's are 3 core A/T and are identical. Any info would be great! Thanks, Tom Attached Images __________________ 72 C-10 Cheyenne Super LWB, Vortec 427,TH700, 3.73 posi, tach, tilt, AM-FM,Frame off in process. http://s289.photobucket.com/albums/l...t=7eae161e.pbw 88 Monte Carlo SS bought new only 10k miles. 73 Chevelle SS 454 had since high school. 74 Camaro Z28 350 AT numbers matching, Black on Black. 73 El Camino SS 350 4sp. 70 Chevelle SS 396 4sp, number matching with LS6 454 69 Chevy C30 Car Hauler 86 K20 383 4sp 4" lift frame off restoration. http://s289.photobucket.com/albums/l...t=1b1082d3.pbw

03-12-2016, 01:33 PM	#2
tll74 "Junkyard Dog" Join Date: Jan 2008 Location: Springfield Oregon Posts: 2,527	Re: Radiator date codes? What does the tag stand for? Somebody must know! __________________ 72 C-10 Cheyenne Super LWB, Vortec 427,TH700, 3.73 posi, tach, tilt, AM-FM,Frame off in process. http://s289.photobucket.com/albums/l...t=7eae161e.pbw 88 Monte Carlo SS bought new only 10k miles. 73 Chevelle SS 454 had since high school. 74 Camaro Z28 350 AT numbers matching, Black on Black. 73 El Camino SS 350 4sp. 70 Chevelle SS 396 4sp, number matching with LS6 454 69 Chevy C30 Car Hauler 86 K20 383 4sp 4" lift frame off restoration. http://s289.photobucket.com/albums/l...t=1b1082d3.pbw

03-12-2016, 02:35 PM	#3
Livrat Member #1049 Join Date: Jun 2000 Location: Troy Montana Posts: 3,940	Re: Radiator date codes? What does the tag stand for? Tom, From my research I have found that the large font on the tag represents the "broadcast code" which was used on the assembly line to identify the radiator as a whole, I do believe this number should be on your build sheet. The smaller fonts on the left identify the end tanks used in each particular application. the numbers below those identify the radiator core assembly, Also if you wire brush the bottom lip you should be able to see the actual GM part number. Here is a link that although it does not pertain to our trucks it will help explain the coding. http://www.camaros.org/coolingsystems.shtml

03-12-2016, 08:30 PM	#4
swamp rat Registered User Join Date: Oct 2007 Location: Spanaway Posts: 8,451	Re: Radiator date codes? What does the tag stand for? Great information! __________________ Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's

03-13-2016, 10:12 AM	#5
geunther Senior Member Join Date: Apr 2005 Location: Cheyenne, WY Posts: 740	Re: Radiator date codes? What does the tag stand for? As stated, the IA and OK are tank codes. I believe the IA is the driver's side and the OK is passenger side. The tanks themselves should also have the same numbers stamped into them. Between the O and K should be a smaller letter date month code. Attached is mine as an example. I have not been able to locate the IA on the driver's side, which is a much smaller tank. Attached Images

03-16-2016, 10:31 PM	#6
tll74 "Junkyard Dog" Join Date: Jan 2008 Location: Springfield Oregon Posts: 2,527	Re: Radiator date codes? What does the tag stand for? Livrat and geunther, Thanks! That's some good info. I'll look at my tanks. Unfortunately I don't have the build sheet on this truck. The seat was changed at sometime so the sheet is long gone. Thanks, Tom __________________ 72 C-10 Cheyenne Super LWB, Vortec 427,TH700, 3.73 posi, tach, tilt, AM-FM,Frame off in process. http://s289.photobucket.com/albums/l...t=7eae161e.pbw 88 Monte Carlo SS bought new only 10k miles. 73 Chevelle SS 454 had since high school. 74 Camaro Z28 350 AT numbers matching, Black on Black. 73 El Camino SS 350 4sp. 70 Chevelle SS 396 4sp, number matching with LS6 454 69 Chevy C30 Car Hauler 86 K20 383 4sp 4" lift frame off restoration. http://s289.photobucket.com/albums/l...t=1b1082d3.pbw



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