Sierra 18-8821-1 MerCruiser Thunderbolt Wiring Plug Set 84-816761Q3

Sierra 18-8821-1 MerCruiser Thunderbolt V8 Gen+ Spark Plug Wire Set

Sierra replacement engine parts are designed to meet or exceed OEM requirements. This spark wire set is used on MerCruiser engines.

Features:

• Kit includes coil wire.
• Kevlar core for maximum durability and long life.
• Durable stainless steel wound conductor for maximum horsepower and engine performance.
• Premium silicone jacketing and boots for the ultimate in high temperature protection.
• Superior RFI suppression for the most sensitive electronic system.
• Corrosion resistant stainless steel spark plug and distributor terminals for maximum conductivity.

Wire Lengths:

• 2 Spark Plug Wires 29"
• 2 Spark Plug Wires 34"
• 2 Spark Plug Wires 38"
• 2 Spark Plug Wires 44"
• 1 Coil Wire 12"

Interchangeable with:

• MerCruiser Stern Drive
• 84-813720A3
• 84-813720A4
• 84-816761A17
• 84-816761A4
• 84-816761Q17
• 84-816761Q3
• 84-816761Q4

Application:

• 200 2BBL. GM    1987-1995
• 230 4 BBL. GM   1987-1995
• 260 4 BBL. GM   1987-1995
• 260 GM             1987-1995
• 350 MAG ALPHA 4 BBL GM  1996-1997
• 350 MAG ALPHA GM   1987-1995
• 350 MAG SKI GM 1995
• 350 MAG SKI GM 1992-1996
• 350 MAG SKI GM 350 V-8  1997
• 357 ALPHA 4V   2008-2009
• 357 MAG BRAVO 4V  2008-2009
• 383 MAG BRAVO 4V  2008-2009
• 5.0L 2 BBL GM 1987-1998
• 5.0LX 4 BBL GM  1987-1995
• 5.7L 2 BBL GM   1996-1998
• 5.7 COMPETITION SKI GM 1997
• 5.7L GM  1987-1995
• 5.7L MIE GM  1994

Frequently Asked Questions

What is the Sierra 18-8821-1 MerCruiser Thunderbolt V8 Gen+ Spark Plug Wire Set used for?

The Sierra 18-8821-1 is a replacement spark plug wire set for specified MerCruiser engines. It features a Kevlar core, stainless steel wound conductors, premium silicone jacketing and boots, RFI suppression, and corrosion-resistant stainless steel spark plug and distributor terminals.

Which MerCruiser engines does the Sierra 18-8821-1 Spark Plug Wire Set fit?

The Sierra 18-8821-1 fits the specific MerCruiser applications listed in the product description, including various 5.0L, 5.7L, 350 MAG, 357, and 383 engines. Listed model years range from 1987 through 2009, depending on the engine and configuration.

What wires are included in the Sierra 18-8821-1 Spark Plug Wire Set?

The Sierra 18-8821-1 set includes eight spark plug wires and one coil wire. The spark plug wires consist of two 29-inch wires, two 34-inch wires, two 38-inch wires, and two 44-inch wires. The included coil wire is 12 inches long.

Does the Sierra 18-8821-1 include a coil wire?

Yes. The Sierra 18-8821-1 Spark Plug Wire Set includes one 12-inch coil wire in addition to the eight spark plug wires. The product description specifically identifies the coil wire as part of the kit contents.

What features does the Sierra 18-8821-1 Spark Plug Wire Set have?

The Sierra 18-8821-1 features a durable Kevlar core, stainless steel wound conductors, premium silicone jacketing and boots, RFI suppression, and corrosion-resistant stainless steel terminals. Sierra states that its replacement engine parts are designed to meet or exceed OEM requirements.

What MerCruiser part numbers are interchangeable with Sierra 18-8821-1?

The Sierra 18-8821-1 is interchangeable with MerCruiser Stern Drive part numbers 84-813720A3, 84-813720A4, 84-816761A17, 84-816761A4, 84-816761Q17, 84-816761Q3, and 84-816761Q4. Verify your engine application and existing part number before ordering.

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