most of them are behind the passenger head on the block near the bell housing.
Under the valve cover 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.
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
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.
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.
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.
1970-71 Chevrolet Small Block 400cid heads.
THE BLOCK CASTING NUMBER IS BEHIND THE CYL. HEAD. SORRY CAN'T REMEMBER WHICH HEAD. IT USUALLY IS A RAISED SEVEN DIGIT NUMBER. THE CYL. HEAD CASTING NUMBER REQUIRES REMOVING THE VALVE COVER AND CHECKING THE RAISED CASTING NUMBER ON TOP OF THE HEAD. YOU CAN CALL A DEALER OR A ENGINE REBUILDING SHOP AND GIVE THEM THE NUMBERS. THEY SHOULD BE ABLE TO GIVE YOU THE YEARS THAT CORRESPON TO THE CASTING NUMBERS.
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
The numbers stamped in front of the head are the engine id numbers.