Tutor Auto Distributor Cap & Rotor Kit for MerCruiser 5.0/5.7/350 V8 — Delco HEI Fit, Brass Contacts

Tutor Auto's Distributor Cap and Ignition Rotor Kit replaces GM Delco HEI distributor parts on marinized 5.0L, 5.7L and 350 V-8 MerCruiser engines to restore reliable spark delivery and engine performance.

This kit is built for boat owners and marine technicians who need a direct-fit replacement for MerCruiser engines that started life as GM Delco HEI systems. It combines durable thermoplastics and solid brass contacts to resist corrosion and wear in the marine environment, and it is manufactured to match the original equipment fit and firing pattern so installation is straightforward.

Will this kit fit my MerCruiser 5.0L, 5.7L or 350 V-8 engine?

Yes — the kit is intended as a replacement for the Delco HEI-style distributor cap and rotor used on many marinized General Motors V8 engines. It replaces OEM part number 808483Q1 and aftermarket reference 18-5281, ensuring compatibility with common MerCruiser conversions.

• Cross-references OEM 808483Q1 and aftermarket 18-5281 for easy verification.
• Designed for marinized GM-derived 5.0L, 5.7L and 350 cubic-inch V8s.
• Delco HEI pattern and terminal layout to match original firing order.

How is the kit constructed to withstand a marine environment?

The cap and rotor are molded from high-grade PBT and PET plastics chosen for heat resistance and dimensional stability under humidity and vibration. Brass conductor elements reduce electrical resistance and resist wear where the ignition coil and spark plug wires connect.

• PBT and PET materials for thermal and chemical resistance.
• Solid brass contacts for consistent conductivity and lower wear.
• Corrosion-resistant finishes suitable for salt- and freshwater use.

What performance or maintenance benefits can I expect after installing this kit?

Replacing an aged cap and rotor restores proper spark distribution and timing consistency, which helps the engine start and idle more predictably. While not a performance upgrade, it reduces misfires and ignition-related drivability issues caused by cracked insulators or worn contacts.

• Improves ignition stability and reduces misfiring risk.
• Restores OEM fit for correct rotor-to-coil alignment and firing order.
• Extends service intervals compared with degraded original parts.

What comes in the package and do you offer warranty support?

The package includes a replacement distributor cap and matching ignition rotor sized for Delco HEI-style marine distributors. Tutor Auto backs the kit with a 12-month warranty and provides replacement or refund options if the product is defective or not compatible.

• Distributor cap and rotor matched to HEI-style MerCruiser applications.
• Packaging labeled with cross-reference 808483Q1 for easy identification.
• 12-month Tutor Auto warranty with replacement or refund service.

Who is this for? This replacement kit is aimed at boat owners, marine mechanics, and restoration projects that use marinized GM V8 engines (5.0L, 5.7L, 350). If you need a direct-fit Delco HEI cap and rotor to correct ignition faults, prevent corrosion-related failures, or maintain original engine behavior, this Tutor Auto kit provides an economical, OEM-compatible option with corrosion-resistant materials and a year-long warranty.