I agree. Compression readings are just one indicator of engine health,
along with history, oil analysis, long-term trends, etc. And some engines
are notorious for low compressions now and then - if you did a top overhaul
every time a cylinder dipped below 60, you'd never get a year without
pulling a cylinder. There is no such thing as a magic number that it a
go/no-go for doing a top.

- Mark