pack of six Champion RBL16Y Resistor spark plugs (Stock No. 73). These are "New Old Stock" (NOS) copper core plugs, commonly used in vintage American vehicles.
Product Specifications
Part Number: RBL16Y.
Stock Number: 73.
Thread Diameter: 14mm.
Reach: 10.9mm (0.42").
Hex Spanner Size: 16mm (5/8").
Seat Type: Tapered.
Key Features: Resistor type to reduce radio frequency interference (RFI) and a projected single electrode for better ignitability.
Common Vehicle Applications
These plugs are primarily designed for classic gasoline engines from the late 1970s and early 1980s, including:
Chrysler/Dodge/Plymouth: Specifically 225 cu in (3.7L) 6-cylinder engines from 1978–1983.
Ford/Lincoln/Mercury: Various models including the Ford LTD, Thunderbird, F-350, and Lincoln Continental.
Other Brands: Frequently listed for vintage Buick, Chevrolet, GMC, and Pontiac applications.
Cross-Reference Guide
If you cannot find this exact Champion plug, the following are common equivalents:
Autolite: 16 or 26.
ACDelco: 46TS.
NGK: 1127 or BP4FS.
Motorcraft: ARF62 or ASF52CF4
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