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Yes. The original 4.3 is the 5.7 with the front two cylinders removed - it will bolt right up to the transmission, and accept the wiring harness. You will have to swap the Blazer's computer with one from a truck that had the 5.7 though.

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13y ago
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Q: Will a 91 5.7 Chevy motor fit in a 91 s10 blazer?
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