4x ACDelco R43TS6 Copper Spark Plugs Fits GM 2.5L Iron Duke & 4.3 TBI Engines For Sale - New and Used

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

• Direct factory data-spread="false">

• 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

Chevrolet

• 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

• Fiero (1984-1988)

• Sunbird (1982-1994 2.5L)

• Grand Am (1985-1991 2.5L)

• Phoenix (1980-1984)

Oldsmobile

• 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:

• 4.3L V6

• 5.0L V8

• 5.7L V8

(Always confirm plug type — GM used multiple plug designs in same years)

Cross Reference

• ACDelco: R43TS6, R43TS, R43T

• NGK: UR5 / TR5

• Denso: Q16PR-U

• Autolite: 605

• Champion: RC12YC

Important Fitment Note

Many GM vehicles changed plug design mid-year.
Always verify using engine size, VIN, or the plug removed from your engine.

What You Receive

• (4) New Genuine ACDelco R43TS6 Spark Plugs

FREE Shipping • Fast Handling • Trusted Seller

---