Abbreviations H

HC -       Hydrocarbons HD -       Heavy Duty HEGO -  Heated Exhaust Gas Oxygen Sensor HEI -       High Energy Ignition Hg -        Mercury HGT. -    Height HLDT -   Headlight HO -       High Output HO2S -   Heated Oxygen Sensor HP -       High Performance hp -        Horsepower HSC -     High Swirl Combustion HT -        High Tension HTR -     Heater Hz -        Hertz (Cycles Per Second)