[79 kmino]

I am going to buy an motor hopefully this weekend. If I could get some help on the numbers it would be appreciated. Start Heads 3973487 A41 GM7 other head 3973487 A31 GM22.
Block information (I hope these make sense) 3970010 A211 GM V0123TBC(I origionally thought the suffix was IBC but I did not see that code) 12 242 2 010 H31not sure of the 1.
I was told block and heads from same engine late model truck. I did check and think heads from 71-72 350 LT1. I would like to know if these all were from the same engine and is the block a 350. Let me know if I need to check any other numbers. thanks mike

 

[DaleM]

I am going to buy an motor hopefully this weekend. If I could get some help on the numbers it would be appreciated. Start Heads 3973487 A41 GM7 other head 3973487 A31 GM22.
Block information (I hope these make sense) 3970010 A211 GM V0123TBC(I origionally thought the suffix was IBC but I did not see that code) 12 242 2 010 H31not sure of the 1.
I was told block and heads from same engine late model truck. I did check and think heads from 71-72 350 LT1. I would like to know if these all were from the same engine and is the block a 350. Let me know if I need to check any other numbers. thanks mike

Heads:
3973487 - 71/72 350
A41 - date January 4, 1971
A31 - date January 3, 1971
GM7/GM22 - casting mold numbers
Block:
3970010 - Late 1969 to 1975 350: A211 - date Jan 21, 1971
V0123TBC - Flint, MI. Jan 23 350/255hp (only TBC suffix code I find is 1970 & 1979 though - could just be an incomplete list on nastyZ28.com.)
12 242 2 010 H31not sure of the 1. - ??? where are these numbers located?

Impossible to know if they're from the same Flint built engine since Flint didn't cast their own parts like Tonawanda, but casting dates are close enough to be a possiblity.

 

[79 kmino]

Thanks for the information. The last set of numbers I do not remember where they were located on the block. I was copying the numbers down but not marking their location. Is there anything from the information given that would state if it is from a truck? Thanks for your help.

 

[DaleM]

I could be wrong (and probably am) but I think any suffix ID code beginning with "T" indicates truck. The majority of stuff I have is for 64-72 Chevelles in particular, don't have much truck info except for the occasional hit from nastyz28.com listings. Another TC member, elcamino, usually has good stuff. Maybe he'll get curious about the thread and stop by.

 

[79 kmino]

Well, even if it is from a truck it seems like a good engine to buy. It is all cleaned and rebuilt to the heads with all the parts to complete the job. Talked to the mechanic that rebuilt the motor and he confirmed the same information that the seller was telling me. Anything else I should look for?

 

[Dean]

Here's what I found listed for "TBC".

1970 Chevrolet Truck - 350 - 255 HP – Manual - 4bbl

1971 Chevrolet Truck - 350 - 255 HP - T.H.350 - 4bbl

1973 Chevrolet Truck - 250 - 100 HP - T.H.350 - 1bbl

1974 Chevrolet Truck - 250 - 100 HP - T.H.350 - 1bb

 

[79 kmino]

Well the last two lines would indicate a 6 cylinder right. So I would guess that it would be one of the first two listings. Than it is a 350 correct?

 

[Dean]

correct

 

[79 kmino]

Thanks for all your help!

 

[SS396-67]

Should be a 4 bolt main also

 

[elcamino]

I could be wrong (and probably am) but I think any suffix ID code beginning with "T" indicates truck.

That is true.

Per my GM parts catalog

The first character of the type designation will always be a "C" or "Z" for passenger, and "T" or "A" for truck.

btw-Current thru 1981 models...