How long in terms of mileage will a Chevy vortec engine last?

I had bought an 87 Blazer when they came out that year and drove the dickens out of it until it was t-boned by a runaway 68 BelAir in 93. I never had a mechanical failure with the Vortec engine. The belt retention frame broke and I drove the Blazer without the fan belt about 3 miles home and the temp gage was trying to register white hot. I fixed the frame and the engine worked flawlessly. When the Blazer died, it had 178,000 miles and I couldn't save the engine because of insurance regs. Too bad.