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The first step to installing the S-Drive kit is to install the ATI crank hub, damper, and pulley. The LS engines use a torque-to-yield bolt to hold the hub in place on the snout of the crank. Therefore, the hub-to-crank fit is rather tight and requires the hub to be pressed into service. Since we’re using an aluminum ATI hub, a quick bath in boiling water will allow it to expand slightly, making the fit not so tight. The secret to driving a new hub on an LS crank is to use an LS7 crank bolt, which is slightly longer than the standard LS fare and isn’t a torque-to-yield bolt. The LS7 bolt drives the hub on as far as possible, then with a used torque-to-yield bolt, the hub can then be driven on the remainder of the way with a final torque to 240 ft-lbs. The used bolt is then removed and a new torque-to-yield fastener is installed, torqued to 37 ft-lbs, followed by a second pass to 140 degrees. A tedious process, but this ensures that the hub is properly seated and torqued to spec.