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I have small block in my truck and want to ID it. The motor is bolted in and I'm not sure if the casting number is visible. All that I know is that its a V8 and two bolt main. This is not the factory motor. Any casting numbers to look for?
 

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Look on the block, rearward side, either on the passenger or driver's side shelf where the top of the transmission bell housing bolts to the engine block. It should be a GMXXXXXXXXXXXXX number.

If you get that number you can Google it or post it up and I can tell you what it is...
 

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