GM HEI Advance Curve Kit

The ALLSTAR PERFORMANCE GM HEI Advance Curve Kit is a complete mechanical advance component assembly designed for GM HEI V8 distributors. This kit provides the bushings, weights, and three sets of interchangeable springs needed to dial in precise ignition timing curves for street, strip, or modified engine applications. The modular design allows tuners to match the advance characteristics to their specific engine combination and fuel octane requirements.

Mechanical advance systems control how quickly ignition timing advances with engine RPM. The three spring sets included in this kit offer different advance rates—stiffer springs retard advance and promote stable low-RPM idle quality, while lighter springs allow faster advance for peak power at higher RPMs. The precision bushings and weights maintain tight tolerances essential for repeatable timing control. Users can test each spring configuration on a dyno or chassis dynamometer to optimize timing curve response for their specific fuel octane, compression ratio, and intended power band.

This advance curve kit is built for engine builders, performance tuners, and enthusiasts who demand control over ignition timing rather than relying on fixed or electronic management. The GM HEI distributor platform remains a cost-effective foundation for high-horsepower carbureted and fuel-injected V8 builds across hot rod, muscle car, and racing applications. By swapping springs, builders can optimize the advance curve without replacing the entire distributor.

ALLSTAR PERFORMANCE specializes in mechanical ignition and fuel system components trusted by circle-track racers and street performance builders. This advance kit is engineered to OEM HEI specifications and maintains the factory bearing and shaft compatibility, making installation straightforward for users familiar with distributor service.