It's a 4" bore block, so probably a 350. Less likely a 327 or 302. There are more characters stamped on a pad in front of the right head that provide additional information. You can write down that info and go to this website: http://www.nastyz28.com/decode.php
350 and 327 [1966 - 1980]
casting number 3970010 is a 350 block from 1969 - 1979 but in 1969 302 and 327 have the same casting # and im not to sure about the other #
1969
1996
a 350 or 327 that is the question. A 350 or a 327
How can I identify if my engine is a 350 or 327? Engine block casting # 3970010 Vin stamped code 18l611487 thnaks, Julio Zamago 3970010 shows up on both 1968 327's and 1969-79 350's could be either originally. without disassembly no way to really know for sure.
i called the Chevy dealership and they told me the year
The back of the block will have a series of letters and numbers cast into it. That is what determines the date.
1969 to 1979 I've seen those blocks up to the mid-80's.
That engine could be anywhere from a 1969 to 1972 350. Some of them were 4-bolt mains and some were just a 2-bolt main engine.
Look again, could it be 3970010? If so it came out of a 1969-79 car, truck or Vette
Numbers on the motor of trucks and other vehicles are identification numbers for the engine block casting. These numbers identify the batch of production the engine block comes from and can be used in recalls.