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YES it will fit right in. But now hears the problem that you will have.

The 91 is a fuel injected computer controlled engine and the 86 is not. Therefore you would need the entire wiring harness and computer plus the fuel pump that's in the 91 fuel tank. You will run into all kinds of problems trying to get the 91 engine to run in that 86 truck. It would be cheaper and easyer to get a carburatored engine and put it back in the 86 truck.

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13y ago
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Q: Will a1991 Chevy 5.7 engine fit in a 1986 Chevy truck?
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