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ACCEL 140003 ignition super coils are 45000V and fit GM HEI ignition systems.Direct performance replacement over stock unit. The housing is combination of the classic ACCEL Yellow with an attractive chrome coil cover ACCEL Super Coils feature advanced bobbin technology highly specialized silicone magnetic steel cores along with optimized winding resistance and turns ratios to deliver up to 15% more energy than the OEM coils. Specialized high temperature epoxy resists shock and vibration while increasing thermal conductivity. These are direct plug replacements for OEM coils. They feature bodies and/or secondary towers molded in ACCEL yellow.