The number 3970014 corresponds to the year 2023 and is part of Block 397.
1970-1973
That # was used from 70-76.
3970014 350 69-77 Pass,Chevelle,Camaro, Nova,Monte Carlo 2 or 4 bolt main 3970014 350 69-79 Truck 2 or 4 bolt main 3970014 350 72 Corvette late '72,200 HP,255 HP 4 bolt main
The GM engine with the casting number 3970014 is a 350 cubic inch small-block V8. The stamped numbers T0125CKD indicate that the engine was assembled on January 25th, and the "CKD" suffix suggests it is a high-performance version, likely from the late 1960s or early 1970s. The additional number 12R534212 is a unique serial number for that specific engine. This engine was commonly used in various GM vehicles during that era.
Actually that casting number covers the years from 1968 to 1979. 2 and 4 bolt mains. A very generic 350 number
Current LTC block year is 2010-2013
397000
1981 was the last year the 400 small block was made.
MorTec.com has casting numbers and information
1987 1994
1998.
Polly and waz