69-72 radiator tags

[Thomas D.]

I'll bet someone out there can help me with this research. I'm looking at making the small clip on metal tags for the 69-72 brass/copper radiators and I need a little help. I have saved a couple original ones but I need the gaps filled in.

69-72 small block (auto) rad 3019190 Tag MH9
69-72 small block (man.) rad 3019189 Tag __________?

69-72 big block (auto) rad 3018802 Tag ___________?
69-72 big block (man.) rad 3018803 Tag MK9

The letters are about 5/8" tall and the number is about 3/8".

I also have a tag with 3018574 MJ9 but I don't recognize the part number as Corvette. Can anyone fill in my blanks? td

[Terry F.]

Re: 69-72 radiator tags

I believe I have the tag off of a BB 68 brass radiator if that would help? Terry

[Joe L.]

Re: 69-72 radiator tags

Tom-----

I think that you have the small block and big block radiator part number sets reversed. I can confirm that "MH" is the code for the GM #3019190 but I don't have the codes for the others. Also, I can't find a thing on the GM #3018574.

[Thomas D.]

Re: 69-72 radiator tags

The 66 BB is different. That's carried over from mid year cars and should be 3008667 MK letters only. No number. This tag is already being reproduced.

[Thomas D.]

Re: 69-72 radiator tags

I've double checked the part numbers and I think what I posted is correct. Doesn't anyone have jugding manuals that say something? It is after all the judging manual that people are going to have to match.

[Thomas D.]

Re: 69-72 radiator tags

What I failed to put in my thread is what these tags mean. I have some GM drawings and the large embosed letters are broadcast codes for transmission type. The part number of the radiator is "stamped" in small 1/4" letters and many times rusted away or paint fills it in and you can't read it. I am pretty sure that the missing ones are MJ9, but I don't have any documents to prove this. Does any one have any original tags? Is there any reference to these tags in the current judging manuals?

[Joe L.]

Re: 69-72 radiator tags

Tom-----

I think that you must have some references that have the part numbers reversed. The GM #3019190 is the BIG BLOCK radiator with oil cooler (i.e. auto trans). The core is 27-1/" wide. This radiator has NO provisions for an integral radiator cap, but has a nipple on the right tank for connection to the external supply tank. It was used from 1969 through 1972 for big blocks with auto trans. Later, it became the SERVICE radiator for ALL 1969-72 big block applications, except L-88/ZL-1/ZR-2. It is definitely code "MH"

I don't show any record, at all, of the 3019189 part number. For 1969-72 Corvettes with big block and manual trans (i.e. NO oil cooler), I show part number GM #3018571 as being the PRODUCTION part used. This piece was available in SERVICE until March, 1970 when it was replaced, for SERVICE, by the 3019190 as described above. This radiator is identical to the 3019190 except that it has no oil cooler provisions. Since I can find no record of the 3018574, code "MJ" part number that you mention, could it be that this number is actually 3018571? The "MJ" looks like a broadcast code that could "fit" that unit.

GM #3018802 is the SMALL BLOCK radiator used in PRODUCTION for applications with THM-400. This radiator has an integral filler cap fitting on the right tank and DOES NOT use an external supply tank. It was used for small block applications from 1969 through 1972. The core of this unit is 26" wide.

GM #3018803 is the small block raditor used in PRODUCTION for 1969-72 applications with manual transmission and a/c. It was also used for many 1969-70 L-46 applications without A/C and most all 1970-72 applications with LT-1 (except, possibly, a few 1970 LT-1 and all ZR-1). This radiator is identical to the 3018802 except that it has no provisions for an oil cooler. It was discontinued from SERVICE in June, 1974 and replaced by the GM #3018802 described above.

I am 100% certain of the above-referenced information as far as big block/small block usage goes.

I have looked "high-and-low" for the broadcast codes for the 3018571, 3018802, and 3018803, and I can't find them. They are not shown in the 68-69 NCRS Judging Guide, either. The 68-69 JG also does not reference any of the above part numbers. Are they judged? I don't know. This could be one of the "secret" items that are not in the JG, but are judged.

I would think that the best source for information on the codes for the 3 applications in question would be folks with cars that have these radiators installed. The plates with the codes are not that difficult to see (possibly requiring a light and a mirror) and I would hope and ask that folks with such cars try to obtain the info and post. I'm curious, myself, now.

[Bill W.]

Re: 69-72 radiator tags

my early 70 L46 4 speed with ac #2650 has 3018803 MK9 26" ...Bill

[Richard K.]

Re: 69-72 radiator tags

My late production '69, Nov. 25, 1969, w/ 350/350, M-21 4-sp, no air, has a tag MK9 w/date Oct 9,1969. This tag info is from my written restoration file. I don't have access to the actual radiator right now so I can't say where I saw the date of Oct 9. Also, I didn't see a GM part number stamped anywhere on the radiator.

[Joe L.]

Re: 69-72 radiator tags

Rich-----

Your car should have the 3018803 radiator just like Bill's 1970, especially since they both have the "MK9" code. So, now we've filled in the blank for the GM #3018803 radiator; it's "MK9". Now, we have only TWO blanks to fill in----the GM #3018802 small block with auto trans and the GM #3018571 big block with manual transmission.

[Thomas D.]

Re: 69-72 radiator tags

Joe,

Thanks for straightening me out, I did type the sb/bb chart backwards. I also studied my one MJ9 tag and it is actually a 3018571, not 3018574 as I said. I also recieved an email from Larry B. from this forum and he has the same tag. So now we are down to one left.

69-72 Big block (auto) rad 3019190 Tag MH9
69-72 Big Block (man.) rad 3018571 Tag MJ9

69-72 Small Block (auto) rad 3018802 Tag ___________?
69-72 Small Block (man.) rad 3018803 Tag MK9

So come on you SB auto guys. Get out the mirrors!

[Dick W.]

Re: 69-72 radiator tags

Tom, I have a customer that has an original 12,000 mile '72 auto. I will try to see the tag.

[G B.]

MJ9 tag

Tom -

I've got an MJ9 tag from a '69 427/435hp 4-speed radiator that you can use for a sample. However, it doesn't sound to me like you need it anymore. If you do, tell me and I'll send it.

Jerry

[Richard K.]

Re: 69-72 radiator tags

Tom and Joe,

Glad I could contribute some info that helps in this research. Joe, If I recall correctly, you also have a late production '69 (built after Aug '69 due to extended '69 production caused by strikes). You may have found that parts with GM numbers that were destined for '70 production were used on our cars. As time goes by, the NCRS judging manuals are catching up with this information. For years, my alternator would have failed judging since it shows a '70 application number. My restoration file has a note that concurs with the #3018803 radiator for my '69 L-46, man., no-air. I believe I made this note after reading an article written by Sal Carbone for Vette magazine years ago. Sal, I believe, has a very low mileage unrestored '72, LT-1. Tom, perhaps you should contact Sal for additional or corroborating information; just shout across the vendor isle at Carlise to him, or maybe someone on the board could provide phone or address information.

This has been an excellent thread. You guys are great!

Happy Holidays
Rich Kossum
#12684

[Thomas D.]

3018802 is MI9

I've been trying to post a picture of the tag. Lets see if this one works. Thanks to everyone for helping and Happy Holidays!