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Set of 4 – Genuine ACDelco R43TS6 Professional Copper Spark Plugs
Genuine ACDelco R43TS6 spark plugs are OE-style copper core plugs designed for many 1980s-early 1990s GM engines including the famous Iron Duke 2.5L and early throttle-body injected engines. They provide proper heat range, reliable ignition, smooth idle and dependable starting — exactly what these engines were engineered to use.
Perfect for restorations, stock maintenance, and drivability repair.
Key Features
ACDelco Professional Conventional Series
Copper core center electrode
Nickel alloy firing tip
Internal resistor suppresses electrical interference
Correct OE heat range
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Part Number: R43TS6
Thread Size: 14mm
Reach: 0.708\" (18mm)
Seat Type: Tapered
Hex Size: 5/8\"
Heat Range: 43
Electrode Material: Nickel Alloy
Core: Copper
Resistor: Yes
Gap: Verify by engine (typically .035–.060\")
Quantity: Set of 4
Verified Vehicle Compatibility2.5L Iron Duke 4-Cylinder
S10 Pickup (1985-1993)
S10 Blazer (1985-1993)
Celebrity (1982-1989)
Citation (1980-1985)
Camaro (1982-1986 2.5L)
Lumina (1990-1994 2.5L)
Pontiac
Cutlass Ciera (1982-1993 2.5L)
Calais (1985-1991 2.5L)
Omega (1980-1984)
Buick
Century (1982-1993 2.5L)
Skylark (1982-1992 2.5L)
Some Early GM TBI Engines (Verify Before Purchase)
Used in select applications of:
(Always confirm plug type — GM used multiple plug designs in same years)
Cross Reference
Important Fitment Note
Many GM vehicles changed plug design mid-year.
Always verify using engine size, VIN, or the plug removed from your engine.
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