Stress-relieved immediately after molding to ensure dimensional stability, this HEI-style performance replacement distributor cap is an impenetrable barrier to arc-through and crossfire. Engineered specifically for 6-cylinder 4.0L Jeep engines, this cap has highly conductive, corrosion-resistant brass inserts and stainless steel rotor springs for unrestricted spark-energy flow, maximum energy transfer, and more power. Performance replacement Heavy duty for maximum energy transfer Stress relieved immediately after molding to ensure dimensional stability Features brass inserts and stainless steel rotor springs