I see your point, but there isn't enough material to machine down the 61 and be safe, thus the added crank pulley boostmonkey used. I am really surprise he was able to push the limits of the supercharger a little further. But I think in the long run, this will hurry up it's life expectancy. I like to drive my cars too much to play with those limits. But he did do a great job with fuel system and all.