That is the number of the block. It was used to build 302, 327, and 350 engines in 2 or 4 bolt main from 1969-1980.
There is a machined pad on the passenger side of the block just in front of the cylinder head that should have a combination of letters and numbers that can provide information about the horsepower and application.
Write down the numbers and look it up at this website: http://www.nastyz28.com/chevy-engine-code-stampings.php
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 #
a 350 or 327 that is the question. A 350 or a 327
i called the Chevy dealership and they told me the year
1969
1996
That should be a 4 bolt main 350
it is a 1969-1979 motor it was used in cars, trucks, and vettes
The back of the block will have a series of letters and numbers cast into it. That is what determines the date.
you need the date code on the side of the block it will be a series of numbers and letters first its the month, then day, then year
What Chevy engine has the casting number 3970011?
1969 to 1979 I've seen those blocks up to the mid-80's.
1968------327 & 1969-79 ----350