1. Locate the Vacuum Advance Port: On the distributor, you'll find a small fitting, usually on the side, designed for vacuum hose connection. It might be a nipple or a short piece of tubing already attached.
2. Identify the correct vacuum source: The 283 typically uses manifold vacuum for the distributor advance. Crucially, do NOT use ported vacuum. Ported vacuum only provides vacuum when the throttle is open, which will severely limit your timing advance at idle and low speeds. You need consistent, uninterrupted vacuum. Locate the manifold vacuum source; this is a vacuum port on the intake manifold. It should be a noticeable port, likely with a larger diameter than other ports. Your intake manifold might have multiple vacuum ports; the shop manual or a parts diagram for your exact intake will clarify which is the correct manifold vacuum source.
3. Connect the vacuum hose: Use a piece of vacuum hose of appropriate diameter (check the size of the distributor port and the intake manifold port to make sure the hose fits snugly). Securely connect one end to the distributor's vacuum advance port and the other end to the manifold vacuum port on the intake manifold. Make sure the hose is clamped securely at both ends to prevent leaks. Using high-quality vacuum hose is important, as cracks or leaks will cause incorrect timing and potentially engine damage.
Important Considerations:
* Distributor Type: The exact location of the vacuum advance port might vary slightly depending on the specific distributor used on your 283. Consult a parts diagram or a shop manual specific to your engine and distributor for precise placement.
* Vacuum Leaks: Vacuum leaks are common and can significantly affect your engine's performance and fuel economy. Carefully inspect all connections for cracks or looseness.
* Shop Manual: The best resource is always a shop manual specific to your 1963 Chevy 283. It will provide detailed diagrams and instructions for all aspects of your engine's systems.
If you're unsure about any aspect of this procedure, it's always best to consult a qualified mechanic. Improper vacuum advance hookup can lead to poor engine performance, reduced fuel efficiency, and even potential engine damage.
