with a specific transducer an oscilloscope can find just about whatever you want it to. hell it'll even tell you what cyl is misfiring if ya know how to use it.

and by knock, i meant knock the computer is seeing. sometimes it hears things you might not be able to.

and most of the rebuilding you'd do on an LT1 is really just assembly/dissassembly. the machine shop is going to do all the hard stuff pretty much. most people dont have the equipment to rebuild a block