Muscle Mustangs & Fast FordsHow To Chassis Suspension
Installing Hurst's Line-Loc on our 2001 GT street machine.
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When you think of the quintessential drag car, there are products that are "must have" items. One such item is a good tach; others include a quality shifter, front skinnies, slicks at the rear, and of course, some headers and sweet-sounding mufflers. Another obligatory item is a Roll Control, or Line-Loc, as it's commonly called.
Quite simply, a Line-Loc is a device designed to prevent the car from rolling. Having this feature allows the driver to lock the front wheels in order to do a burnout. However, a Line-Loc can also serve a few other functions. For instance, it can be used to assist the driver in staging, or it can hold your car on a hill (momentarily), allowing you to operate the clutch and gas to prevent the car from rolling backwards.
Installation is not too difficult, but it involves working with the brake system, so caution must be taken. Hurst Corporation's Line-Loc kit includes a solenoid, wiring, activation button and indicator light. To properly install the kit in a late-model Mustang, it is necessary to use special fittings. Fortunately, Hurst's parent company, Mr. Gasket, sells a separate fitting and brake line kit, a necessity because additional brake lines must be fabricated.
The Line-Loc kit ties into the front brakes of the vehicle and by depressing the brake, and then activating the solenoid, line pressure is maintained and the front brakes remain locked. Hurst recommends using the Line-Loc for momentary use, and not for more than 60 seconds. This is more than enough time to do a burnout and get your slicks hot.
As we mentioned earlier, a Line-Loc also makes staging a stick car easy, because you can apply just a slight amount of brake pressure to prevent the car from rolling in too deep or even out of the beam, causing a red light. By creating drag on the braking system you can operate the clutch with your left foot and the gas with your right, and you never have to touch the brake during the staging process.
The procedure goes something like this: First, pre-stage the car and come to a stop. Lightly touch the brake pedal and then hold the Line-Loc switch/button. (Most racers use a brake pressure gauge to apply the brakes consistently during staging.) Next, bring the rpm up and drag the car forward by slowly inching out the clutch pedal. When the "stage" bulb comes on, get the clutch back in and get the revs up.
Since it is possible to wire a Two-Step and the Line-Loc into the same switch, you'll never have to let go of the button while staging. Finally, when it's time to go, snap your foot off the clutch and release the button. This will become a natural action and part of your routine.
Most will agree the Line-Loc is an integral part of any drag car. It's a tool that is used during every run. However, it is a wearable part; the Hurst unit is rebuildable with Hurst's rebuild kit (part No. 567-1500). To best explain the installation and operation, we installed a Hurst Line-Loc in our 2001 project GT. The total install time was about three hours--after making the necessary connections we had to test the system. (Important note: Before attempting a burnout you must disable the traction control, if your vehicle is so equipped.) So, we hopped in, locked the front tires, revved the engine and dropped the clutch. As expected, the rear tires spun and began to smoke. This was great fun, especially considering they were the company's tires.