Champion 561 Spark Plug

Description

The Champion 561 Spark Plug is engineered for dependable ignition performance in a wide range of vintage automotive, agricultural, industrial, and motorcycle applications. Backed by Champion’s global engineering from Federal-Mogul, this standard replacement spark plug is designed to perform reliably in high-compression and aggressive operating environments where consistent ignition and durability are essential.

Built with durable nickel electrode materials, a flat seat design, and crush washer, the Champion 561 is manufactured for long-lasting service in legacy engines that require dependable spark delivery under high-temperature and high-load conditions. Its non-resistor construction supports traditional ignition systems, while the factory pre-gap helps simplify installation and maintenance.

Designed for broad fitment across classic cars, early trucks, motorcycles, generators, and industrial equipment, the Champion 561 is a practical replacement choice for preserving reliable engine operation in older applications.

Features

• Designed for high-compression and aggressive operating environments

• Manufactured for long-lasting durability

• Backed by global engineering from Federal-Mogul

• Standard replacement spark plug for vintage automotive and industrial engines

• Nickel center electrode for dependable ignition performance

• Nickel ground electrode for durable service life

• Pre-gapped at 0.025 in (0.65 mm) for installation convenience

• Flat seat design with crush washer for secure fitment

• Non-resistor construction for traditional ignition systems

• Built for high-temperature and high-load operating conditions

Specifications

• Part Description: Spark Plug

• Plug Type: W16Y

• Center Electrode Tip Material: Nickel

• Center Electrode Design: Standard

• Ground Electrode Quantity: 1

• Ground Electrode Tip Material: Nickel

• Ground Electrode Core Material: Nickel

• Pre-Gap Size: 0.025 in / 0.65 mm

• Hex Size: 0.938 in / 23.830 mm

• Insulator Height: 0.08 in

• Manufacturer Heat Range: 16

• Seat Type: Flat

• Reach: 0.625 in

• Thread Diameter: 0.875 in / 22.225 mm

• Resistor Type: No

• Washer Included: Yes

• Washer Type: Crush

• Indexed: No

• Hex Type: Hex

• Classification: Champion Agricultural Plugs

• Grade Type: Standard Replacement

• Subject to Prop 65: No

Fitment

Compatible with a broad range of vintage automotive, industrial, and motorcycle applications, including examples from the supplied fitment data:

• Auburn models including 115, 120, 125, 6-66, 6-80, 6-85, 8-77, 8-88, 8-90, 8-95, 88, Model L, and many additional early Auburn applications

• Apperson Eight (1925–1926)

• Buick Standard Six (1928)

• Case models including Jay-Eye-See, Model U, Model V, Model X, and Model Y

• Chandler models 32A, 33, and 35

• Chevrolet National and National Truck (1928)

• Chrysler models including B-70, Series 60, 62, 65, 66, 70, 72, 75, and 80 L Imperial

• Cole models including Aero Eight, Series 870, Series 890, and multiple Four and Six applications

• Durant models including 40, 55, 60, 65, 66, 70, 75, A22, and B22

• Elcar models including 6-50, 6-60, 6-65, 6-70, 75, 75A, 8-80, 8-81, 8-82, 95, and 96

• Erskine models 50, 51, 52, and 53

• Ford Model A (1928–1931), Model AA (1928–1931), Model B (1932), Model BB (1932–1934), Model 18 (1932), Model 46 (1933), Model 40 A (1934), 1 Ton Pickup (1932), 1/2 Ton Pickup (1932), 3/4 Ton Pickup (1932), and Sedan Delivery (1928–1934)

• Gardner models including 120, 125, 130, 136, 140, 148, 150, 158, 8-75, 8-80, 8-85, 8-90, and 8-95

• Graham and Graham-Paige models including 610, 612, 614, 615, 619, 621, 629, 834, 835, 57, 57A, 64, 65, 67, Prosperity, Special, and Standard

• Hupmobile models including Century Series 125, Century Series A, Series A, E-1, E-2, E-3, and several early Model 20, 32, and R-series applications

• Jewett New Day and Six

• Jordan Air Line Eight, Great Line Eight, Line Eight, and several Four and Six applications

• Kissel Series 6-73, Series 8-126, Series 8-90, Series 8-95, Series 80, Model 55, and Model 70

• Locomobile Junior 8, Model 48, Model 90, Model 8-70, 8-80, and 88

• Maxwell Model 25 and 25-C

• Moon models including London, 6-40, 6-48, 6-50, 6-58, 6-60, 8-80, Model A, and Series A

• Nash Series 40, 680, and 690

• Oakland models including Greater Six, 212, 6-54, 50, and multiple early four- and six-cylinder applications

• Packard Single Six, Single Eight, Twin Six, and models 626, 633, 640, 645, 726, 733, 734, 740, and 745

• Paige models including 24, 6-26, 6-45, 6-65, 6-70, 6-75, and 8-85

• Peerless models including 125, 56, 6-60, 6-61, 6-70, 6-72, 6-80, 6-81, 6-90, 6-91, 66, 8-67, and 8-69

• Plymouth Model Q (1928) and Model U (1929)

• Pontiac models 6-26, 6-27, 6-28, and 6-29 A

• Roamer models including 4-75, 6-50, 6-54, 8-80, 8-88, and additional C- and D-series applications

• Star Four, Star Six, Model F, and Model F-25

• Stevens-Duryea models including AA, C-6, CC, D-6, G-6, U, X, XXX, Y, and Tourer AA

• Whippet Model 96A and 98A

Additional applications from the supplied data include:

• Harley-Davidson DL (1929–1931)

• Harley-Davidson RL (1932–1936)

• Harley-Davidson VL (1930–1933)

• Caterpillar equipment

• Wayne equipment

• Burro equipment

• Kohler 1KW and 5KW units

• Gordon Smith 60

Verify exact fitment by make, model, year, engine size, and thread specifications before purchase or installation.