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how to ID sbc displacement

gravdigr

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I'm looking at a blazer to buy and the seller doesn't know the engine displacement just that it's a V8. Is there any way to tell externally from the engine? It's in an 86 blazer.
 

big83chevy4x4

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if its stock then is most likely a 305.

under the alternator is the stamping codes. the last 2 or 3 letters tells you what it is and what year. take those letters and match them up here
 
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