Description
SPARK PLUG
Specifications
Thread Diameter: 14 mm (0.551 in)
Reach: 0.433 in (11 mm)
Seat Type: Tapered
Heat Range: 5
Pre‑Gap: 0.044 in (1.12 mm)
Resistor: Yes (suppresses RFI/EMI)
Center Electrode Core: Copper
Center/ground electrode tip: Nickel alloy
Insulator Height: 2.468 in (62.7 mm)
Overall Length: 4.75 in; Hex Size: ∼16 mm (5/8‑14)
Features & Construction
Copper core with nickel alloy sheathing enhances heat transfer and durability.
Nickel-chrome ground electrode resists erosion.
Ribbed suppressor seal and Black Onyx coating help prevent flashover and corrosion
Cross‑Reference Equivalents
Common suitable alternatives include:
NGK: BPR4FS, UR4 (Nickel-copper core) [sparkplug-…erence.com], [automototips.com]
Bosch: 0242219516, HR10BC, WS8E, WS9EC
Champ/RV series: Champion 25, 25CC, RV12YC, RV15YC4, RV17YC, RV17YCT04
Denso: 5025, 5330, ITF16, T16PR‑U
Autolite/Accel: 255, 258, Accel 0576S
Typical Applications
Fits GM and other older models (especially V8 engines from the late ’60s to early ’70s):
Buicks: GS 350/455, Electra, LeSabre, Skylark (1968–1979)
Other GM vehicles with similar thread and heat range requirements [newparts.com]
Also used in marine and generic engines: Black Onyx version is corrosion-resista
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