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Yes this is possible since they are both LT1 style engines. Everything will plug in the same but you will need a PCM for the 5.7L or get the original reprogrammed by someone like PCMforless.com to correct the extra fuel needed by the larger engine.

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Q: Can you change your engine from 4.3L V8 to a 5.7L V8 in a 95 Chevy caprice?
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