70 ls6 correct radiator ???

[graperat]

What is the correct radiator for a 70 ls6 chevelle with an auto trans and 3.31 gear ratio?? what letters should be stamped on the tanks?? where is the radiator date coded also?? thanks

[Mr70]

Dennis
It should normally be an 3 core with that combination.
Do you have a Buildsheet with callout?
When the LS6 Came with either an M-22,or a TH400 trans.& a 4:10 Rearend it automatically got a 4 core Radiator.
The 4:10 was the distinguishing component for them.
1970 LS6 Radiator Codes:
3 Core
BQ-Man. Trans
BR-Auto Trans.

4 Core
PA-Man Trans
PD-Auto Trans
These suffix codes were stamped onto a tag on the Passengers side tank.It was a seperate tag from the Radiator tank.

[graperat]

Thanks for the quick reply and helpfull info.The build sheet is not on hand.Car was a basketcase 15 years ago when i bought it.If the tag is not on the tank,will the tanks themselves have any letters on them?? Since my car was a 3.31 i guess i can go with the 3 core since it would be easier to find,anybody have that puppy?? thanks

[graperat]

what other car would have this same correct radiator,i just bought a 70 ss 454 monte carlo for parts and it is an auto 3 core rad,i didnt even think about a ls6 being nothing but a 4 core.i assume they all are harrison radiators??

[Mr70]

I deleted my sentence in earlier post,a 4 core wasn't possible with a 3:31/LS6.Sorry for the mis-information.
The Harrison Tanks are correct,and the Monte Carlo tanks will work,as long as they are an Auto car as yours is.
You might want to get the Rad re-cored though.
Suffix on 3 core rad tanks should be:
I A-on Drivers tank.
X I-on Passengers tank.

I have a 3 core Rad here now.You will also need the Correct 3 core radiator shroud for it.
This shroud is unique in that it is different from the 4 core shroud,and is not correctly repoped today.
I have one of those too.

[graperat]

my other 70 ls6 that has the 3.31 man trans has a 4 core with all the correct stamps and tank tag(got info from the ls6 benchmark website)The dealer sheet showing the options and price markup on the car shows a heavy duty raditor up grade for a pretty cheap price. I guess that explains that 4 core story on that car.I only have a copy of this sheet obviously for the dealers eyes only,the guy i got the car from gave me the copy that he recieved 22 years ago from the guy he bought it from.Someone somewhere has some important paperwork that i need,that is why in another post i sure would like to know how to crack that oregon DMV. I do know the original dealership,do they keep that type of info if there still in business??

[Mr70]

Dennis
PM your VIN#,I may be able to help with the DMV..stress MAY.
Do you have a copy of the buildsheet for that other LS6 with the 3:31 4 core?

[graperat]

All i have is a copy of the dealer markup sheet showing how much each option cost the dealer and how much they were marking it up,i have never seen aything like it.my car is an arlington car and has never been tore completely down to find a build sheet.there may not be one there.

[graperat]

Hi,did you recieve my emails mr 70?? thanks