A stock HEI module limits coil saturation time, which caps how strong a spark it can deliver no matter how good the rest of the ignition system is. This Dyna-Module bolts into the factory location and raises that dwell time, giving TBI and TPI-injected GM V8s a longer, more complete spark.

DUI 000333 7-Pin Dyna-Module Ignition Control Module Features:

• Fits 1981-1990 GM computer-controlled V8 distributors with coil-in-cap.
• 7-pin design replaces the stock ignition module.
• Increased electronic dwell for longer coil saturation time.
• Mounts in the original factory location with no modifications.
• Sold individually.