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.
The Chevy casting number 460777 corresponds to a cylinder head that was produced in 1972. These heads were typically used on various Chevy small block engines during that time. To confirm specifics about the application, it's recommended to check additional identifying marks or numbers on the head.
The GMC motor with block casting number 8970010 is typically associated with the 5.7L (350 cubic inch) small-block V8 engine. This engine was commonly used in various GMC and Chevrolet vehicles during the 1980s and early 1990s. It is part of the Gen I small-block family, known for its versatility and performance in trucks and cars alike.
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.