If you have a small block Chevy engine, and need to identify any parts you have laying around, or maybe the engine that is in your truck, I think you will find the pages below invaluable.
 
 

Block Casting Numbers:
These numbers are located on the drivers side of the engine, at the back of the head on the transmission mounting flange.  If the engine is still in the truck it will be a little hard to see it.

• Small Block Chevy Block ID

Block Suffix Codes:
The suffix numbers are located on the pad in front of the passenger head, at the mating surface between the head and the block.  If your block has been decked to help raise the compression or just to true up the head mounting surface, the numbers may have been removed during the process.

• Small Block Suffix Codes

Head Casting Numbers:
The number you need is located on top of the head, in the center.  So this means you will have to remove the valve cover if it is not already off.

• Small Block Chevy Head ID

Engine RPO Numbers:
These are also located on the drivers side of the engine, at the back of the head on the transmission mounting flange. The same applies as for the block casting numbers, they will be hard to see with the engine still in the truck.

• Small Block Chevy Engine RPO #'s

Engine Summary 1970 - Current:
A comprehensive list of engine specifications, such as bore & stroke, HP & torque ratings, compression ratio and the induction system they might have came with.

• Small Block Chevy Engine Summary

RPO Menu:
List's all the GM RPO numbers and their descriptions.  The RPO's are on the label on the glove box door.  A very useful page.

• GM RPO Menu

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