Like this ???

Make yourself some detcans and use these as insurance - they're a bit like a stethoscope for an engine. All you need is a pair of ear defenders, some hose and a bit of copper tube. Hammer the end of the tube flat, drill a hole in it and bolt this to the block. Stick the hose in the other end of the copper and route this to the cabin. Drill hose-sized holes in the ear defenders and stuff the hose into these.

Believe it or not, they do work!