There is nothing to tell. Most that bought them didn't know how to set them and always used the internal vacuum leak as a reason to return them. There is no such thing in an 1850. But also most really did not know how to properly set up and adjust them either. The 1850 was and still is a universal carburetor. In the hands of the right people that know how to set them up and adjust them it is a fantastic carburetor. I sold them all day long 79.95 LOL Ya look what they are now. Then you need to invest another addition amount in jets ,springs, pump cams etc. to set them up on your engine . The nice thing I was an hired by Holley as an Rep for warranty acceptance right threw my own store. I was also known for this and on Test and Tune nights at the local Drag Strip I would make 100 buck telling a guy I could make his car run quicker ET's in less then 2 minutes. LOL if you worked on 1850 or any holly you should know what I did. LOL
