Dist. Adv Lockdown Plate GM HEI w/Mech. Advance

The Distributor Advance Lockdown Plate for GM HEI with Mechanical Advance is a precision locking device designed for engine builders, street rod enthusiasts, and performance mechanics who need to eliminate centrifugal advance curve variations in their ignition systems. This lockout plate is essential for vehicles running custom ignition timing tables, fixed advance setups, or those requiring repeatable, consistent timing across all RPM ranges. By securing the mechanical advance mechanism, it ensures your tuned ignition curve remains stable under all operating conditions.

The Distributor Advance Lockdown Plate works by mechanically restraining the centrifugal weights and springs inside the HEI distributor, preventing them from advancing timing as engine RPM increases. This compact component—measuring just 3 x 0.35 x 3.2 inches and weighing a mere 0.02 lbs—interfaces directly with the stock GM HEI advance mechanism without requiring internal distributor modifications. The design maintains full compatibility with existing mechanical advance components while offering the flexibility to lock advance at a fixed value, making it ideal for engine combinations where electronic or carbureted fuel delivery demands a predictable ignition curve rather than automatic centrifugal progression.

Performance-minded mechanics and classic car restorers benefit most from this lockout plate when building engines with carburetor tuning, nitrous oxide applications, or supercharged powerplants where advance control must be manual or software-managed rather than mechanical. Installation is straightforward for anyone with distributor experience—no special tools or internal machine work required. It's particularly valuable for dyno tuning scenarios where locked timing allows precise evaluation of fuel and ignition requirements before committing to a final advance curve. The Champ Pans CP726 lockdown plate delivers the repeatability and control serious engine builders demand.