I have a 65 6 cylinder that has developed a high whistle in the engine bay when the motor is running. When you listen it is very hard to figure where it is coming from. Wondering if any one else might have had this problem.
And what did you find out. Checked all the hoses they seem good. Any ideas?

 

most likely a vacuum leak .. take a short piece of any kind of hose ( garden hose ) 3 feet or so and stick one end to your ear and move around the engine with the other end sort of like a stethiscope .. when you hear it loudest you are close .. then spray a little carb cleaner in that area and the engine should speed up a bit ..

 

It was the hose going to the modulator on the tranny.