Testing carb jet flow rates

[700rpm]

I spent the better part of today testing all the new and used carb jets in my carburetor drawer and in my cars. The results were eye-opening to say the least. Measurements were wildly divergent, especially for the main jets, and most were not even close to specs. I selected main, cap, comp and idle jet sets that were the closest to being what they should be, and put those in each of my cars.

Of the new jets only the cap jets came close to being within tolerance. Most jets, even originals, were larger than they should be.

I'll be watching mileage and smoothness over the summer to see if there is significant improvement and will report my experience. The lesson learned is, check the flow if you can, and be wary of new jets.