Crankshaft Pulley For GM LS, Short Spacing, Corvette

Pulley System Requires - use of Speedway Motors SFI-rated LS balancer Part Number 910-21811. Machined from 6061-T6511 aluminum for strength while being as light as possible. Available in all three standard LS pulley depths (short, mid, and long styles) Lightening holes to minimize overall weight while improving throttle response. Allows easy pulley changes if different LS front accessory drive depth needed. 2 Piece kit available - Includes Crankshaft Pulley and Harmonic Balancer under Part Number 910-21815. Easily Convert from One LS Accessory Drive Depth to Another The LS family of engines has no doubt become the mainstay of engine swaps in just about anything with wheels. The allure of cheap horsepower in a compact and easy to install package certainly helps us understand why, but as popular as the LS swap is, there are some things to look out for when performing said swap. One such thing is GM’s decision to use different accessory drive depths across the various platforms the LS engine family has been installed in. While the LS has a lot of commonalities to it (some of which are even shared by its older small block Chevy sibling), these differences in LS front accessory drive depth can become a headache for LS swap projects. There are three different LS front accessory drive depths for the various Gen 3 and Gen 4 small blocks found in the LS engine family. There is the short (Corvette), the mid (Camaro), and the long (truck) depth. Each version is used in a specific chassis application to allow the engine to clear the frame, suspension, cooling fan/radiator, and other components packed into the engine bay. If you’re not sure what accessory drive depth you are dealing with you can determine the original pulley depth via the application list below or see our how to measure your factory crankshaft pulley depth in our installation details section. Our new CNC machined aluminum pulleys work in conjunction with our SFI rated LS engine balancer to allow simple conversion from one depth to another as needed for your engine swaps. Bolt-On Design Means Not Having to Remove Your Engine’s Balancer to Make Changes The factory LS engine balancer features a machined pulley mounted to the balancer hub. This requires complete removal of the balancer and a new balancer bolt every time the balancer is removed to change accessory drive depth. Our LS accessory drive crankshaft pulleys work in conjunction with Speedway Motors’ SFI rated LS engine balancer by simply bolting on over the face of the balancer. This allows quick and easy changes to your LS accessory drive depth if anything should change in your engine compartment. Perhaps you’re using the long (truck) accessory drive depth since your LS came from a Silverado, but now you need to go to the short (Corvette accessory drive) depth for additional cooling fan clearance or for routing of your turbo’s hot side crossover plumbing. Whatever the reason, simply swap pulleys, update your water pump and any LS accessory brackets to keep everything lined up and you’re good to go. Machined from High Quality 6061-T6511 Aluminum for Utmost Strength Our LS crankshaft pulley offerings are CNC machined from solid 6061-T6511 aluminum stock and then hard coat anodized for corrosion resistance and a long life with minimal wear from your serpentine belt over time. While 6061 is already a lightweight material, we have strategically placed lightening holes in the pulley faces to further reduce weight of our LS crankshaft pulleys to provide quick throttle response. These pulleys are designed to work with stock accessories and pulleys or can be incorporated into aftermarket pulley systems of the same accessory depth. As noted above, installation requires the use of our SFI rated LS engine balancer and these LS crankshaft pulleys directly mount over this balancer using the bolts included with the balancer.