Even if you vaperized the radiator most cars will drive for several miles.
Same if you just crack the block or shoot thru a valve cover and disable a rocker. Its still gonna run until it overheats. It might not run too sporty with a busted rocker but that wont be enough to stop it. It would take a mighty round indeed to bust an engine bad enough to stop it right there. Even if you put a hole in the oil pan you'd be surprised at how long it will run. I took an old Buick 455 once with a rod knocking and held it to the floor to see how long it took to blow. After about five minutes the rod and parts of the piston came out the side of the block and oil pan but it still ran for several minutes until it seized up from lack of oil.