1964 Impala 340 HP 409, I’m having trouble with my 4GC carburetor.

[Don Jacks]

Steel is preferred for faster heat transfer to the chokes coils.I think that I used 5/16 brake line for the last one that I did.

 

[grumpy]

I had the same problem with mine. Never figured it out. Went to a 3x2 setup.