Description
ACDelco R43S is a conventional copper-core resistor spark plug commonly used in many older GM applications and marine engines.
Key specs:
Part Number: R43S
Thread Size: 14 mm
Reach: 0.370 in (9.4 mm)
Heat Range: 3
Resistor Plug: Yes
Factory Gap: 0.033 in (0.89 mm)
Seat Type: Gasket/Flat Seat
Copper-core center electrode
Commonly found in classic GM V8 applications, including many Chevrolet engines from the 1950s through 1970s
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