Chrysler 331ci V8 Marine Engine

First-Generation “FirePower” Hemi Marine Powerplant

Product Overview

The Chrysler 331ci Hemi Marine Engine, commonly known as the M-45 FirePower Marine, is one of the most legendary marine V8 engines of the 1950s.

Based on Chrysler’s first-generation Hemi architecture, the 331 Marine Hemi became famous for powering:

• Luxury mahogany speedboats
• Classic offshore cruisers
• High-end performance boats of the postwar era

It is especially associated with iconic boat manufacturers such as:

• Chris-Craft
• Riva

Today, authentic Chrysler Marine Hemis are highly sought after by:

• Vintage boat restorers
• Marine collectors
• Classic Hemi enthusiasts
• Nautical concours builders

Engine Specifications

Key Features

First-Generation Hemi Architecture

The Chrysler 331 introduced:

• Hemispherical combustion chambers
• Improved airflow efficiency
• High-performance V8 engineering for its era

Benefits included:

• Strong torque output
• Smooth power delivery
• Exceptional durability

Marine-Specific Engineering

The marine version featured:

• Corrosion-resistant marine components
• Specialized cooling systems
• Marine exhaust and ignition adaptations

Designed specifically for:

• Continuous marine operation
• High-load boating environments

FirePower Heritage

The “FirePower” branding became synonymous with:

• Premium American V8 performance
• Chrysler engineering innovation
• Luxury marine power in the 1950s

Historical Significance

The Chrysler 331 Marine Hemi helped define the golden age of luxury wooden speedboats.

It became a favorite in:

• Chris-Craft performance cruisers
• Italian Riva runabouts
• High-end postwar marine applications

The engine is widely admired for:

• Its unmistakable appearance
• Distinctive Hemi valve covers
• Deep vintage V8 sound
• Historical importance in marine performance culture

Collector & Restoration Value

Original Chrysler Marine Hemis are prized for:

• Concours restorations
• Period-correct boat projects
• Vintage marine racing history
• Rare early-Hemi collector appeal

Collectors often seek:

• Correct marine intake systems
• Original marine exhaust manifolds
• Matching Chrysler Marine identification tags
• Factory cooling and ignition components

Condition & Restoration Notes

Potential buyers and restorers typically verify:

• Casting numbers and date codes
• Marine-specific components
• Internal engine condition
• Cooling-system integrity
• Carburetor and ignition originality

Professional inspection is recommended for vintage marine engines before operation or restoration.