[Heavymetl]

The engine itself of an LS swap will last for decades.

The rest of the build quality is where it counts. Fuel system, hoses rubbing, wiring quality, well made grounds, etc. Alternator failures seem common if you don't have the PCM controlling it, which the stock one does. Aftermarket ECUs need the 470 ohm resistor.

Otherwise, the short block would be about the last concern I'd have with the build.