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most of them are behind the passenger head on the block near the bell housing.
It is stamped into the top of the heads where the valve springs are.
A small or big block Chevy have a casting number on the top of the block behind the driver side head. MorTec has Chevy casting numbers listed online.
Drivers side, right in front of the cylinder head, there is a pad on the block, with a series of numbers, starting with 2 letters, usually.
read casting numbers and research on the web. Just Google small block Chevy heads castine numbers. These numbers are under the valve covers so you will have to take one off.
Under the valve cover where the valve springs are.
Can't find that casting number - but it could be either a 307 or a 350. A list of small block casting numbers can be found here: http://www.nastyz28.com/sbchevy/sblock.php 39700XX is almost at the bottom of the list.
That casting number belongs to a 1971 Impala. It is a 400 small block chevy. These can be pretty good motors.
motor #3978010
The best way to identify your motor is to use the casting numbers on the drivers side rear of the block, behind the cylender head. The cylender head casting numbers may help too, they are located under the valve cover.
look on the bellhousing on the driver's side and write the numbers down and look the numbers up. Google 350 Chevy casting numbers online or go to your local library. the year and the casting number will give you all the specs on that engine.
Answer the block casting #are on the back of the block and on the frount there is aleo a # on the sied of the block it is the last 3 #`s of the block coad. the frount # is usuly altered when engine builders like (jasper) rebuild them. so your best # to go by is on the rear fo the block.The casting numbers on any small block Chevy are behind the distubar on the drivers side if the block and the numbers can be identified at any dealership AnswerNo,that answer isn't correct.The casting number is on the passenger side of the engine just below the head right in front.You'll see where the block sticks out past the head (like a shelf)that's where it's at. AnswerThe number cast into the back of the block can tell you what size motor your looking at. The number on the front can tell you the year and type of vehicle it came from as well.