The Wilwood 160-8403 is a left-hand GT 72 Curved Vane rotor measuring 14.00 x 1.10 inches, with a 12 x 8.75 inch bolt circle. The manufacturer builds its GT and GTB 72 Curved Vane rotors from a proprietary Spec-37 iron alloy designed to resist distortion, warping, cracking and wear at extreme temperatures. This plain-finish, vented, GT-slotted rotor is the lighter-gauge option for drivers who want a track-proven iron rotor without paying for the black e-coat version. Compared with a generic blank, the 72 curved vanes and Spec-37 casting are the features that justify the price, since they are built for repeated hard stops rather than occasional street use. Enthusiasts searching for a 14 inch left-hand Spec-37 iron rotor, 12x8.75 GT slotted rotor, or 1.10 inch thick curved vane rotor will find this part matches those specs.
Because it is a two-piece design, the rotor bolts to a separate hat rather than mounting directly to the hub. Confirm that your hat and caliper bracket match the 12 x 8.75 bolt pattern and that your wheels clear the caliper before ordering. If you are weighing this against the 1.25 inch version, the wider rotor adds mass and thermal capacity, so check your caliper and wheel clearance first.
No. The manufacturer's install sheets for its GT-style rotors describe bolting the rotor to a separate hat with washers and bolts, so you will need a compatible hat. Confirm the hat's bolt pattern with the manufacturer before purchase.
The 160-8399 is the same 14-inch left-hand GT 72 Curved Vane rotor, but at 1.25 inches thick instead of 1.10 inches. Choose based on the thickness your caliper and wheel clearance require.
Per the manufacturer's install sheets, safety wiring with 0.032-inch stainless wire is an optional extra measure of security on the rotor-to-hat bolts.
Wilwood's install sheets say this kind of work should only be done by someone experienced with disc brake systems. Raise and support the vehicle, remove the wheel, caliper and pads, and slide off the old rotor. Clean the hub face and remove any rust, burrs or casting irregularities, because the hat must seat flush against the hub or excess runout may result. Apply red Loctite 271 to the rotor-to-hat bolt threads and torque them to 155 in-lb in an alternating sequence, using an inch-pound torque wrench. Check the wheel clearance diagram in the install sheet for your specific kit before mounting wheels. Torque values can vary by kit, so follow the sheet that matches your hardware.
