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Dimensions of this wooden "stethescope"???
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I happened to have a scrap that was roughly 1 inch by 3/4 inch and about 2 or 3 feet long. But anything will work. The noise vibration will travel along whatever you use. Long screwdriver, scrap of wood, scrap piece of conduit. Whatever you got handy.
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Thanks for all the replies!
Yesterday I just started tearing the thing apart looking for a leak in the intake where I could hear hissing. The intake manifold gasket was completely gone around cylinder 4! I don't know why, maybe got eaten away by coolant from my leaky heater core valve? Anyway, I have a new gasket and will install tomorrow. Then I guess I'll check the valves for a bunch of shrapnel once I've got everything else back together.