Part Number Structure Guide
Format: [Resistor][Thread][Heat Range][Firing End][Gap]
Resistor Codes:
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R = 3k-10k ohm resistor
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K = 1k-2k ohm resistor
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T = 7k-15k ohm resistor
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Q = Low resistance inductive
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X = Combined resistive/inductive
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U = Internal auxiliary air gap
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(blank) = Non-resistor
Thread Codes:
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A = 12mm x 1.25mm gasket
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C = 14mm x 1.25mm gasket
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CJ = 14mm x 1.25mm short gasket
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DJ = 14mm x 1.25mm taper
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E = 14mm x 1.25mm long taper
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F = 18mm x 1.5mm taper
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G = 10mm x 1.0mm gasket
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J = 14mm x 1.25mm gasket
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L = 14mm x 1.25mm medium gasket
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N = 14mm x 1.25mm gasket
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P = 12mm x 1.25mm gasket
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S = 14mm x 1.25mm taper
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V = 14mm x 1.25mm taper
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Y = 10mm x 1.0mm gasket
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Z = 10mm x 1.0mm gasket
Heat Ranges:
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1-20: Automotive/Small Engine
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20-49: Historical Aviation
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50-65: Racing
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65-100: Industrial
Firing End Codes:
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YC = Standard copper
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YCX = Extended copper
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PYC = Platinum tip
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WYC = Iridium tip
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GYC = Gold palladium
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LM = Lawn mower special
Gap Designations:
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2 = .020"
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3 = .030"
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4 = .040"
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5 = .050"
Note: This list represents commonly available Champion spark plug part numbers. Availability may vary by region and application