Watch in action

Precision Timing Control

Unlock the full potential of your GM HEI ignition system with the ACCEL Adjustable Vacuum Advance Unit. Factory vacuum advance canisters often lack the flexibility needed for modified engines, leading to pinging or sluggish performance. This adjustable unit allows you to precisely dial in your ignition timing curve, ensuring optimal combustion efficiency and throttle response under varying load conditions.

Why Choose ACCEL Adjustable Advance?

• Custom Tuning: Easily adjust the rate and amount of vacuum advance to suit your specific engine build.
• GM HEI Compatibility: Designed specifically for GM HEI distributors for a perfect, hassle-free installation.
• Improved Driveability: Eliminates engine knock and hesitation during part-throttle acceleration.
• High-Quality Diaphragm: Built for longevity and consistent performance under vacuum pressure.
• Easy Adjustment: Simple hex-key adjustment allows for quick tuning at the track or in your garage.

By tailoring the vacuum advance to your engine's unique vacuum signal, you can achieve a smoother idle and better fuel economy while maintaining peak power output. This is an essential upgrade for anyone running a performance camshaft or modified intake setup. Stop settling for generic timing curves and take control of your ignition performance. For all your precision tuning needs, look no further than GGCRACING.