C2 BB radiator identification help

[Rich P.]

Re: C2 BB radiator identification help

Steve,

I should add that I have seen them on a VERY FEW. If your clamp is stamped with a 2 and it has the flanged pan head slotted screw it was probably put on at St. Louie. I think the workers would get the over flow hose confused with the balance hose that ran between the coolant tank and radiator on aluminum radiaor equipped cars. Let us know the specs on the clamp.

Rich

[Steven S.]

Re: C2 BB radiator identification help

How is that for service! Yes, there is a "2" on the clamp along with the flanged head screw.

[Rich P.]

Re: C2 BB radiator identification help

Steve,

That is sweet!!! I would put it back just as it was a factory screw up and see if and judges bust your chops about it.

Rich

[John D.]

Re: C2 BB radiator identification help

Did the factory units have the "MK" tag or was that only on the service units ?. It looks like there was a "MJ" unit that used the same core but had a trans fluid cooler under p/n 3008566.

BTW the core p/n is 3008620.

[Rich P.]

Re: C2 BB radiator identification help

John,

MK is for all 390-400-435 4 speed cars. MJ was for 390-400 cars with a powerglide. All these tags were on the radiators for the line workers to know what to put in.

Rich

[Dereck S.]

Re: C2 BB radiator identification help

I bought the radiator. Hard to go wrong at that price. Thanks for all the info.
Dereck

[Joe L.]

Re: C2 BB radiator identification help

Did the factory units have the "MK" tag or was that only on the service units ?. It looks like there was a "MJ" unit that used the same core but had a trans fluid cooler under p/n 3008566.

BTW the core p/n is 3008620.

John-----


I have seen some originals that, apparently, didn't have the broadcast code tag, but most of them do. SERVICE units may or may not have the tag. I think it may depend on when they were manufactured. The 3008566 was available for a LONG time------from October, 1965 through January, 1999.

The 3008566 was also used for 1968 Corvettes with small block and THM-400 transmission. Some 1968 small blocks with C-60 and manual transmission may have used the 3008567.

GM "re-used" the "MK" and "MJ" broadcast codes during the 1976-78 period. However, the radiator part numbers were different and the configuration of the radiators was different. They were similar in some respects to the 66-68 radiators but are in no way the same.

It would have been nice if GM had offered that 3008620 core in SERVICE but, from what I can find, they never did. At least, they did not through the GM parts system. It might, possibly, have been available through Delco, though.

[Bill C.]

Re: C2 BB radiator identification help

How is that for service! Yes, there is a "2" on the clamp along with the flanged head screw.

Nice post, my 390 BB # 9514 had the original radiator in it with that same clamp on the overflow hose, AOS car. Always thought that even though not intended, it was factory installed, I plated it and put it back when I restored the car, the MK tag also had at least one other very small slip on tag mounted on it also, I do not remember right now what it was but I did save them also. Any one else seen those? I assume they were just QC or inventory ID's of some sort.
I had my original recored reusing the same end tanks and top and bottom rails by Portell Radiators in Mo., great guy. I have had quite a few done by him, he has a web sit under that name.
Bill Caldwell

[Ronald L.]

Re: C2 BB radiator identification help

Anyone know what the 73H means on this same 3008566 radiator tag?

[Ronald L.]

Re: C2 BB radiator identification help

pic added now

[Joe L.]

Re: C2 BB radiator identification help

pic added now

Ronald-----


Most likely a date code representing August, 1973. These radiators were manufactured for SERVICE long after they were last used in PRODUCTION for the 1968 model year.

In fact, if this radiator was found in a car with manual transmission, then you otherwise KNOW it's a SERVICE radiator. The 3008566 is a radiator equipped with an oil cooler for automatic transmission applications and in PRODUCTION was used for those applications. The radiator used in PRODUCTION for manual transmission applications was GM #3008567 which had no oil cooler provisions. It was once available in SERVICE, too, but was discontinued in December, 1971 and replaced by the 3008566.

[Joe R.]

Re: C2 BB radiator identification help

John,

MK is for all 390-400-435 4 speed cars. MJ was for 390-400 cars with a powerglide. All these tags were on the radiators for the line workers to know what to put in.

Rich

Rich,

What about 425 hp (L72) 4 speed cars? MK?

Joe

[Rich P.]

Re: C2 BB radiator identification help

Rich,

What about 425 hp (L72) 4 speed cars? MK?

Joe

Joe,

66-68 BB 4spd cars used the MK taged radiator.

Rich