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
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
Polly and waz
1987 1994
1998.
current LTC block year as on today 22 April 2009 is-> 2006-2009.