* Camshaft: Different camshafts will require different timing settings. A mild street cam will have a different optimal timing than a high-performance race cam.
* Compression Ratio: Higher compression ratios generally require less initial timing advance.
* Fuel Type: The octane rating of the fuel significantly impacts the timing. Lower octane fuel necessitates less advance to prevent detonation.
* Ignition System: The type of ignition system (points, electronic ignition, etc.) can influence the optimal timing.
* Altitude: Higher altitudes require less timing.
Instead of a specific number, you need to consult:
* Your engine's specifications: If you have original documentation for your specific 352, it might list a recommended starting point.
* Your camshaft's specifications: The camshaft manufacturer's instructions will almost certainly provide timing recommendations.
* A workshop manual for your year and model: These manuals offer detailed information and procedures for setting the timing correctly.
General Approach:
Typically, you'll start with a base timing advance (often around 8-12 degrees BTDC - Before Top Dead Center) and then use a timing light to adjust the distributor while the engine is running to find the best setting. This involves gradually advancing the timing until you find the point where the engine runs smoothly and produces the most power without knocking or pinging. This process often requires iterative adjustments and listening carefully to the engine's sound. Incorrect timing can lead to poor performance and engine damage.
In short, there's no magic number. Finding the correct timing requires research, a timing light, and careful attention to your engine's behaviour. Consult a reliable manual or professional mechanic if you are unsure how to proceed.
