I do not have any 16-51 metering rods. I have 1 pair .068 x .052 and another pair at .0695 x .047. Read the article from The Carb Shop on metering rods. The closest I could find new were .067 x .049 for your AVS2. You can also go larger with both the jets and rods or smaller with both the jets and rods, but you have to do the math and calculate the areas of both diameters (Area = Pi x D/2 Squared) and subtract the smaller from the larger.
