Setting proper ignition timing on your 5.0-liter Mustang improves the performance of your car in most cases by .15 to .25 second. Almost all 5.0-liter Mustangs come from the factory with the timing set between 5 and 9 degrees, while the proper setting is 10 degrees before top-dead-center (BTDC). For optimum performance, timing should be set between 13 and 15 degrees. After advancing the timing, your engine will rev more quickly because the spark will fire sooner during the compression stroke. This change gives you more midrange power and better all-around driveability. Almost all the Mustangs I've driven have responded well to 14 degrees, but this doesn't mean it will work best in your car.

To set base timing, you'll need a timing light and a 1/2-inch wrench. If you need to buy a timing light, buy an inexpensive one. Begin by marking the timing indicator on the crankshaft balancer. Use typing correction fluid or white model paint to mark the 14-degree spot with a thin line. Then remove the spout connector found hanging from the single wire attached to the distributor-wire harness (top). Next, start the engine and check base timing. Now shut the engine off and loosen the 1/2-inch bolt at the base of the distributor. Once the distributor is loose, fire the engine and set the timing to 14 degrees by turning the distributor slowly. While the engine is running, be careful not to get loose clothing or jewelry caught in the fan, for it will surely ruin your weekend. After the timing is set, tighten the distributor and check to make sure it hasn't moved. Finally, put back the spout connector and test. If the connector is left out, the computer won't allow maximum timing and fuel curve, and the performance will show it. If your car pings under hard acceleration, consider a 92-plus-octane super unleaded gasoline. If it still pings, double-check the timing. If you set it at 14 degrees, back off until detonation is no longer present.

Investment: $40 for an inexpensive timing light