I thought I had fixed a LOUD whistle (Vacuum leak) coming from my rebuilt Rochester in my '46 Merc (Flathead 8). It went away when I replaced and filled the Air Cleaner's Oil bath - for about a week, but now it's back.
It's a vacuum leak of some sort but I couldn't find it with a tube and trying to cover different areas, plus, I sprayed starter fluid around it but no idle changes....
Anyone heard this before or have any ideas on how better to pinpoint the leak? Thx!