I am somewhat surprised at the number of negative comments concerning the Uni-syn on this thread.

Possibly this stems from a misunderstanding (or a previous misunderstanding) of the use of the tool.

The Uni-syn is a tool that will aid in the synchronization of LINKAGE on a multiple carburetor setup running solid linkage.

It will NOT Help:

(A) progressive linkage setups
(B) mismatched carburetors
(C) carburetors of the wrong size
(D) carburetors which are improperly rebuilt
(E) mixture calibration

I started working on multiple carb setups in about 1960. At that time, the Uni-syn was a tool of the wealthy. I learned to synchronize carburetors using a piece of vacuum hose. When I could finally afford a Uni-syn, I was in "hog heaven" grin

I still have the first Uni-syn I purchased, about 1966, and yes it still works well. And it has been used on everything from 2 to 6 carburetor setups...............successfully.

Jon.

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop