To establish the correct advance curve, the vacuum advance and mechanical advance in the distributor must work properly with no binding. When a small-block Chevy is started, the spark is retarded to 4 degrees BTDC. As soon as the engine starts and a vacuum is produced, the vacuum advance mechanism advances the spark ... It’s accurate to ± ½-degree so you get dead-on timing, even as you spin that small block up past 7,000 RPM. Signal to the distributor must be fed via crank trigger to ensure all-around precision. The housing is billet aluminum and home to a ground stainless steel shaft, precision bearings, and a high-quality rotor.

JEGS 40500K2 - Mopar Ignition Kit Fits Small Block Mopar "LA" Engine 273/318/340/360 $212.49 Some parts are not legal for use in California or other states with similar laws / regulations Small Block Mopar Engine Kit - fits 273, 318, 340 & 360 Contains 112 fasteners for the following: Distributor Hold Down, Thermostat Cover, Fuel Pump, Valve Covers (steel or aluminum), Oil Pan, Intake Manifold & Water Pump / Timing Cover