We have a two-part Tech Tip that covers this thread and well as the How to straighten your Rochester B or BC thread. They are in a nice, neat PDF format, very suitable for printing out.

The Tech Tips cover:
Part 1 - Common Issues covers a lot of ground (12 pages - give it time to download wink ) with a helpful schematic on the last page.
Part 2 - Casting Fixes (five pages) looks specifically at repairing warped Air Horn and Fuel Bowl castings, with helpful details and images.

Both parts can be found HERE in the Engines Tech Tip forum. There is also a follow-up thread HERE for Q&As, comments and the like.

We are locking down this thread so the discussions can be held in the Engine Shop.

~ Peggy M
1949 Chevrolet 3804
"Charlie" - The Stovebolt Flagship
In the Gallery
"Success comes in 'cans' ..."