I've discussed this with Bill and have actually modified the factory arms. I made the cut closer to the adjuster bolt. Nothing fancy, .070" cutoff wheel and mig welded back together. I think the ratio is in the area of 1.58:1. I never checked each arm individually to see their difference but I immagine they are no different than the variences experienced in the factory arms. I never ran them in a race environment as I hurt the old engine before I could get them on. I did have them ready to go since I put them on the car & lashed & numbered them so I could make a quick change at the track.