Champion 512 Spark Plug

Description

The Champion 512 Spark Plug (H12) is a Copper Plus small engine spark plug designed to deliver dependable ignition performance in small engines, vintage automotive applications, and utility equipment. It features a copper core center electrode that improves conductivity and heat control, helping extend spark plug life and maintain consistent ignition.

Engineered as an OE-style replacement, the Champion 512 spark plug is built to ISO and SAE standards and provides excellent resistance to fouling and corrosion. Its durable construction makes it suitable for older engines and equipment operating under demanding conditions.

With a 14 mm thread diameter, 0.438 in reach, and flat seat configuration, this plug is commonly used in vintage vehicles, marine engines, small equipment, and utility motors.

Features

• Copper Plus design for dependable performance

• OE type replacement spark plug

• Copper core center electrode improves heat control and conductivity

• Resists fouling for reliable ignition

• Superior corrosion resistance

• Built to ISO and SAE standards for proven durability

Specifications

Brand: Champion
Part Number: 512
Plug Type: H12
Classification: Champion Copper Plus Small Engine
Grade Type: Standard Replacement
Part Description: Spark Plug

Electrode

• Center Electrode Tip Material: Nickel

• Center Electrode Design: Standard

• Center Electrode Diameter: 0.1 in

• Ground Electrode Quantity: 1

• Ground Electrode Material: Nickel Copper Alloy

• Ground Electrode Core Material: Nickel

• Ground Electrode Tip Material: Nickel

Dimensions

• Thread Diameter: 14 mm / 0.551 in

• Reach: 0.438 in

• Hex Size: 0.813 in / 20.650 mm

• Seat Type: Flat

• Washer Included: Yes

• Washer Type: Crush

• Installed Height: 2.24 in

• Taper Diameter: 0.31 in

Performance

• Manufacturer Heat Range: 12

• Pre-Gap Size: 0.030 in / 0.78 mm

• Resistor Type: No

Additional Details

• Electrical Terminal Type: Non-Removable Nut

• Hex Type: Hex

• Indexed: No

• Subject to Prop 65: No

Applications

The Champion 512 (H12) spark plug is commonly used in vintage automobiles, marine engines, and small engine equipment, including examples such as:

Automotive

• Cord 810 (1936) – 4.7L V8

• Cord 812 (1936–1937) – 4.7L V8

• Hudson Hornet (1952–1954) – 5.0L L6

Small Engines and Equipment

• Clinton J7 and J8 engines

• McCulloch engines and equipment

• West Bend engines

• Elgin small engines

• Sears and Wizard branded equipment

• Johnson and Evinrude marine engines

• Aero Marine AM5000 series

Additional compatibility may include Firestone, Viking, Commodore, Foremost, Perkins, and Terry Troller equipment.

Fitment Note

Because the Champion 512 spark plug is used across many engine types and equipment brands, always verify compatibility by checking:

• Engine manufacturer specifications

• Thread diameter and reach

• Seat type and heat range

• OEM spark plug cross-reference