* Engine condition: Worn components can affect optimal timing.
* Modifications: Aftermarket parts (camshaft, intake, etc.) significantly alter timing needs.
* Vacuum advance: This system adjusts timing based on engine load and speed; malfunctions affect timing.
* Distributor type: Different distributors might have slightly varying specifications.
Instead of searching for a specific number, you need to consult your owner's manual or a Ford service manual for your specific year and model. These manuals provide the *base* timing specification, usually given as degrees BTDC (Before Top Dead Center) at idle. However, the final timing will be adjusted using a timing light while the engine is running to account for vacuum advance.
In short: Don't rely on a single number found online. Find the proper documentation for your Bronco and follow the procedures outlined there. Incorrect timing can cause poor performance, reduced fuel economy, and even engine damage.
