Description
The Autolite 685 Copper Spark Plug is built to deliver dependable ignition performance, quick starts, and consistent power for a wide range of classic and older vehicle applications. Featuring a copper core center electrode, it provides excellent heat transfer and helps reduce fouling for smooth engine operation.
Constructed with a corrosion-resistant nickel-plated shell and high nickel alloy electrodes, this spark plug offers durability and long service life. The high alumina ceramic insulator enhances thermal conductivity and strength, making it a reliable choice for standard replacement needs.
Features:
- Copper core center electrode for improved heat dissipation and fouling resistance
- Nickel-plated shell for corrosion resistance and extended durability
- High nickel alloy electrodes for longer service life
- High alumina ceramic insulator for strength and optimal insulation
- Provides quick starts and reliable ignition performance
- Ideal for classic and standard replacement applications
- Backed by a 2-year limited warranty
Specifications:
- Brand: Autolite
- Part Number: 685
- Resistor: Yes (5,000 Ohms)
- Electrode Material: Nickel (center and ground)
- Center Electrode Core: Copper
- Thread Size: M14 x 1.25
- Thread Diameter: 14 mm
- Hex Size: 5/8"
- Seat Type: Tapered
- Pre-Gap: 1.5 mm
- Heat Range: 8
- Ground Electrode Quantity: 1
- Terminal Type: Non-removable nut
- Insulator Material: Ceramic
- Center Electrode Design: Standard (short projection)
Fitment Highlights:
Compatible with a wide range of classic GM and related vehicles, including:
- Chevrolet models such as Bel Air, Camaro, Caprice, Chevelle, Corvette, Impala, Monte Carlo, Nova (mid-1970s)
- Chevrolet/GMC trucks and vans (C/K Series, Suburban, G-Series, P-Series)
- GMC trucks and SUVs including Jimmy and Sprint
- Checker Marathon (1975)
(Primarily fits vehicles with L6 4.8L and V8 5.7L, 6.6L, and 7.4L engines from the mid-to-late 1970s. Always verify exact fitment.)
