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Engineered Marine Products 300-03085 Tune Up Kit with Cap for MerCruiser V8 Thunderbolt HEI Ignition

Manufacturer

Engineered Marine Products

<h3>About Engineered Marine Products (EMP)</h3><p><strong>Engineered Marine Products</strong>, widely known in the boating world as <strong>EMP</strong>, has been a trusted name in marine parts manufacturing for over 40 years. The company supplies OEMs, distributors, dealers, and rebuilders worldwide with high-quality aftermarket components engineered to meet or exceed original equipment manufacturer (OEM) specifications. Whether you maintain a weekend fishing boat or a performance inboard, EMP&apos;s extensive catalog is built to keep marine engines running reliably season after season.</p><h3>A Marine Parts Specialist Built on Engineering Precision</h3><p>EMP&apos;s foundation is precision manufacturing. Their design and production processes leverage modern engineering technology, with a focus on dimensional accuracy, material quality, and long-term durability in the demanding marine environment. Salt spray, constant vibration, wide temperature swings, and moisture ingress are realities every marine component must survive — and EMP engineers its parts with exactly those conditions in mind.</p><p>The brand&apos;s catalog spans a remarkably wide range of marine engine subsystems. From cooling and fuel delivery to gearcases, propellers, transom components, and steering systems, EMP offers solutions for outboard engines from manufacturers including Mercury/Mariner, Yamaha, BRP (Johnson/Evinrude), and Force, as well as inboard/sterndrive platforms such as MerCruiser, OMC, and Volvo Penta.</p><h3>Ignition and Electrical Components</h3><p>One of EMP&apos;s most comprehensive product areas is marine ignition and electrical systems. Their <a href="/13199-engineered-marine-products-ignition-control-module-10488">Ignition Control Modules</a> and related ignition components cover a broad spectrum of inboard and outboard applications — from distributor caps and rotors for Volvo Penta V8 engines to ignition coil assemblies compatible with MerCruiser 3.0L through 8.4L GM-based powerplants and OMC configurations. Reliable spark delivery is critical to engine performance and starting consistency on the water, and EMP&apos;s ignition lineup is designed to deliver dependable output across the entire RPM range.</p><h3>Gaskets, Seals, and Engine Integrity</h3><p>Keeping a marine engine leak-free is just as important as keeping it firing correctly. EMP&apos;s <a href="/13199-engineered-marine-products-gaskets-seals-201268">Gaskets &amp; Seals</a> lineup addresses the full range of engine and gearcase sealing needs — including gearcase seal kits, Teflon lip seals, fuel injector crush ring kits, and comprehensive engine gasket sets. Proper sealing prevents water intrusion, oil loss, and exhaust leaks that can quickly sideline a boat and lead to expensive engine damage.</p><h3>Why Boaters and Technicians Choose EMP</h3><ul style="list-style:disc"><li><strong>OEM-Grade Quality:</strong> Parts are engineered to meet or exceed original manufacturer specifications, ensuring proper fit and reliable function.</li><li><strong>Broad Application Coverage:</strong> EMP covers major outboard and inboard/sterndrive platforms from leading marine engine brands.</li><li><strong>Trusted Supply Chain:</strong> EMP products are sold through OEMs, distributors, and dealers globally, reflecting deep industry confidence in the brand.</li><li><strong>40+ Years of Manufacturing Heritage:</strong> Decades of marine-specific engineering experience inform every product in the EMP lineup.</li></ul><p>For boat owners, marine technicians, and engine rebuilders who demand components they can count on, Engineered Marine Products delivers the quality and application coverage to get the job done right.</p>

Part Number

300-03085
09/12/2036 5:41 AM
Sale Price

$29.97

2 left at this price

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Usually delivered within 2 days

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Product Details

The Engineered Marine Products 300-03085 is a complete tune-up kit with distributor cap designed for MerCruiser V8 engines ranging from 180 to 800 horsepower with Thunderbolt HEI ignition systems. This kit is specifically engineered for 1981-2001 GM and MIE V8 marine engines equipped with Thunderbolt HEI ignition.

Key Features:

  • Includes distributor cap, rotor, and cap gasket for complete ignition system service
  • Meets all OEM requirements for reliable performance
  • High-performance construction with marine-grade materials designed to withstand harsh marine environments
  • Direct replacement for Mercury 805759Q3 and Sierra 18-5273

Replaces OEM Part Numbers:

  • Mercury: 805759Q3, 805759T6, 805759T4
  • Sierra: 18-5273
  • CDI: E66-0012
  • GLM: 71780
  • Mallory: 9-29350

This tune-up kit delivers the essential ignition components your MerCruiser V8 needs to maintain peak performance and reliability, ensuring consistent spark delivery and smooth operation on the water. Regular maintenance with quality replacement parts helps prevent engine misfires, power loss, and starting problems while promoting improved fuel efficiency.

Hope I get the parts I expect some of the description is hard to interpret.

so far so good cheap price 50.00 cheaper it worked out got here fast the right part good job thanks

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A service

This company had the VERY best price on the product that I was seeking. The check out process was so simple and the order shipped the next day! We will be checking them out for all our product needs!

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The information about the item I was looking for was good enough for me to confidently order.

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