Guide to carbs

Mike's Carburator is a good source for the kit; as above, their application guide with the list numbers is the most complete around. Sorensen is another source; Otteezone and maybe others see Sorensen. Get the 4 digit list number off the carb first thing; that is the key to the right kit. It will be a stamped number. (Not a cast number which is the individual casting PN).

The needle and seat in my 1920 kit from Mike's were supposedly OK for ethanol.

Another variable is the accelerator pump rod, both style and length. There are 2 variations on this; Sorensen kits come in a few versions for this difference. My Mike's kit came with the wrong one , but I modified/rebuilt the new diaphragm with the old rod and went on my way. Mike's sell both types.

Throttle shaft bushings can be checked before ordering. Mine were like new.

If you have a grain scale for measuring light things like bullet powder loads, then wipe the old float dry as soon as you pull it out of the carb and weigh it right then to see if it has absorbed any gas and is heavy. There are 2 weights: 7.4 oz and 12.7 oz. The floats are not in production anymore. Mike's carries the 12.4 oz float; I would get one as they are not produced. I have put the lighter float in place of the heavier one and it was fine; I assume the heavier will work in place of the lighter too.

Look at Mike's video on rebuilding the Holley 1920 as posted above; they are super videos.

My bowl leaked when the gasket was new but I re-tightened several times and it is fine now.