As far as making a stethescope, I just use a piece of plastic hose to tune the carbs on my 1960 morgan. hold one end to ear and the other to carbs - you can hear them hissing pretty well that way. The owners manual for it actually says to do that.
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2011 Nissan 370z Black Cherry Sport Pkg - Daily Driver, , 1960 Morgan +4 fun car, 1986 BMW 325ES, 1998 M3 and 1996 Spec Miata - Race Cars
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