Decode engine block 3970010 !


Veteran Member
Lifetime Gold Member
Dec 19, 2009
jabodyincc said:
i have a chevy motor with the casting #3970010 and the prefix # off the front pad behind the altenator is v0616tbc does anyone know what this motor would be?

Code Year CID Vehicle HP RPO Trans Carb Comments
TBC 70 350 Truck 255 LS-9 Manual 4-Brl C 10 & C 20, 4X4
TBC 71 350 Truck 255 LS-9 TH 350 4-Brl All Models
TBC 79 350 Truck 165 LS-9 Manual 4-Brl

You have to check your casting date on the passenger side bell housing flange


New Member
Aug 4, 2014
Clover, SC
I just bought a 65 Impala with what was told to me to be a 350 4bolt. I've checked mortec and other websites, but not able to completely discern the info on the front pad.
The casting number is a 3970010
And the pad numbers are as follows:
Can anyone shed light on this for me?

Gary S

Lifetime Gold Member
Apr 14, 1999
Bismarck, North Dakota
CKH code was used in 1973 and 1974 on 350 in many cars, but those engines would not likely be 4 bolt main blocks. You won't know until you get the pan off some day.

The VIN on your block however doesn't match a 73 or 74 engine. It wants to be a 1977 engine as the second digit is a 7. CKR would be a 1977 engine. Is it possible that the H is really an R?
The D in the VIN says the car was built at Atlanta and I don't have a listing of the cars Atlanta built in 1977. As late as 1975, they were building Chevelle and other A body cars.


New Member
Mar 31, 2019
Just bought a 73 K10 with what I believe to be a 69 Z28 motor. Block is cast with 3970010 and stamped VC918TJD. Anyone able to confirm? I bought truck thinking it was original motor, but was way more excited earn I saw these numbers...

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