Here's 177 years' worth of old Rovers. Reliable? Many force landing type incidents over the years suggest not in aircraft terms. Only one (the red one) has the original engine though they are all contemporary units. None of them has ever had a catastrophic engine failure as such, but ignition, fuel pump and lubrication failures have made the owner personally familiar with most of the lay bys on the A1. I'd rather not be flying in a Land Rover!
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Interestingly, the red one (the fire engine variant) has beefed up radiator, governor, oil cooling, tropical fan and so on and can maintain full throttle (48HP) for a few minutes at a time. It's also the only one with an unrebuilt engine. Try that with the ordinary 2Ltr overhead inlet / side exhaust and small end knocking is a likely outcome.