After getting my 51 Chevy on the road and after driving it around for several months, I've developed an intermittent clutch grinding noise. I have a 61 235 engine, T5 trans, 10 1/2" clutch. The noise is only when the clutch is depressed and not all the time. I can sometimes get it to start the noise by moving the shifter to the right like I'm going into 5th or R but again not all the time. And When I get the noise, if I let out the clutch and then depress it again, it often goes away. My son used his iPhone to take this clutch noise video. We used a stethoscope and it does not seem to be the throw out bearing or to be coming from the trans but more in the clutch area.