Sierra 18-8826-1 Spark Plug and Distributor Wire Set for Chrysler M273, LM318, M340, M360 V8 Inboard Engines

The Sierra 18-8826-1 is a complete spark plug and distributor wire set built for Chrysler 8-cylinder inboard marine engines. The set is engineered for both conventional and electronic distributor systems, giving it broad coverage across compatible Chrysler powerheads. Each wire uses a mag/wire wound core that delivers maximum voltage to the plugs while suppressing radio frequency interference (RFI) and electromagnetic interference (EMI), protecting sensitive onboard electronics from ignition noise.

Corrosion resistant stainless steel terminals are used at both the spark plug and distributor connections for reliable, long-term conductivity in the marine environment. A kevlar-reinforced conductor core adds durability and resistance to heat and vibration, while premium silicone jacketing and silicone boots shield the wires from high underhood temperatures. The distributor end uses moisture-proof, molded insulators to keep out water intrusion, and a high-quality conductive center carrier reinforcement maintains conductor integrity over the life of the set.

The set includes one coil wire and eight spark plug wires cut to factory-matched lengths for a proper fit across the compatible engines.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-8826-1
• Category: Chrysler Inboard Spark Plug Wires
• Cylinders: 8
• Ignition Type: Conventional and Electronic
• Engine Fitment: M273, LM318, M340, M360
• Wire Lengths: 1 Coil Wire 14 inches, 1 Spark Plug Wire 28 inches, 1 Spark Plug Wire 32 inches, 3 Spark Plug Wires 24 inches, 3 Spark Plug Wires 31 inches
• Material: Kevlar core conductor with silicone jacketing and stainless steel terminals
• Weight: 1.84 pounds
• Product Dimensions: 0.39 x 0.39 x 0.39 inches
• UPC: 808282194536
• Distributor Insulators: Moisture-proof, molded

Fitment

• Chrysler M273, 8-cylinder, Conventional and Electronic distributor, 1968-1974
• Chrysler LM318, 8-cylinder, Conventional and Electronic distributor, 1968-1985
• Chrysler M340, 8-cylinder, Conventional and Electronic distributor, 1968-1985
• Chrysler M360, 8-cylinder, Conventional and Electronic distributor, 1975-1985

Frequently Asked Questions

Which Chrysler marine engines does the Sierra 18-8826-1 wire set fit? The Sierra 18-8826-1 spark plug and distributor wire set fits Chrysler M273 (1968-1974), LM318 (1968-1985), M340 (1968-1985), and M360 (1975-1985) 8-cylinder inboard engines.

Will this wire set work with both conventional and electronic distributors? Yes, the 18-8826-1 set is designed to work with both conventional and electronic distributor systems on the compatible Chrysler M273, LM318, M340, and M360 engines.

How many wires come in the 18-8826-1 set? The set includes 9 wires total: 1 coil wire (14 inches), 1 spark plug wire (28 inches), 1 spark plug wire (32 inches), 3 spark plug wires (24 inches), and 3 spark plug wires (31 inches), covering all 8 cylinders plus the coil.

What material are the wire conductors made from? The 18-8826-1 set uses a kevlar-reinforced conductor core with a mag/wire wound design for durability and consistent voltage delivery.

How much does the Sierra 18-8826-1 wire set weigh? The Sierra 18-8826-1 spark plug and distributor wire set weighs 1.84 pounds.

Does the 18-8826-1 set fit Chrysler 361, 383, 400, or 440 engines? No. Those Chrysler engines use Sierra part number 18-8827-1, a separate SKU with its own wire set, so buyers with a 361, 383, 400, or 440 should order that part instead.

Does this wire set help reduce electronic interference? Yes, the mag/wire wound core in the 18-8826-1 set is engineered to deliver maximum voltage while suppressing radio frequency interference (RFI) and electromagnetic interference (EMI).

Are the terminals resistant to corrosion? Yes, the 18-8826-1 set uses corrosion resistant stainless steel terminals at both the spark plug and distributor connections.

What protects the wires from engine heat? Premium silicone jacketing and silicone boots on the 18-8826-1 wires provide high-temperature protection in the engine bay.

Is the Sierra 18-8826-1 backed by a warranty? Yes, Sierra warrants the 18-8826-1 wire set to be free of defects in workmanship and materials for the useful life of the product, subject to Sierra's standard warranty terms.

Does the distributor end have any moisture protection? Yes, the 18-8826-1 set includes moisture-proof, molded distributor insulators to help keep water out of the distributor connections.

What is the UPC for this product? The Sierra 18-8826-1 spark plug and distributor wire set has UPC 808282194536.