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Even with a lightweight crank, the counterweights on the Scat crank hit the extra thick main webs (the aluminum has less strength than the iron, so the webbing is needed to be thicker). Urban solved this by having the crank counterweights machined by John Kominski to remove about .120 inch at the very edge of the main web-face. This created a 5-degree angle on the counterweights. Kominski then balanced the rotating assembly. To finish off the clearancing, the webs on the block were slightly reworked with the grinder. When completed, there was .060-inch clearance between the crank throw and main webs of the block.