Every Chevrolet V-6 engine block has a metal plate attached to the engine block, listing the specifics of the engine. The casting numbers should be on the engine block plate.
Go here: http://www.cehighperformance.com/c_truck_block_codes.htm
chevy 350
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.
casting numbers are on the back of the block. there are numbers on the pad by the head on passenger side front that will reveal information too
Casting numbers on top of the bellhousing flange and the suffix number on the block deck in front of the passenger side head. The casting numbers will tell you which block casting you have. The suffix will tell you what HP rating it had, what it was likely installed in, and what transmission was mated to it.
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.
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.
A 350 with four bolt main caps is known as the "double-oh ten block." The last four numbers on the casting are 0010.
on the back of the block where the belt housing bolts on and also on the front in front of the passenger side head there is a ledge that has a number there unless the block has been decked
this page will give year and model type and application for all chev blocks: -MorTec, Inc. Chevy Smallblock V-8 Casting Numbers List- copy and drop this on your browser, then choose - -CHEVY V-8 BLOCK AND HEAD casting numbers-
Find a book on casting numbers for chevys it will give you the year of the block the heads & the manifolds.