Spark Plug Index Washers Flat Seat

The Spark Plug Index Washers Flat Seat by MOROSO (MPN 71910) is a precision-engineered set of 30 indexing washers designed to optimize spark plug seating and performance in high-performance and racing engines. These flat seat washers ensure proper spark plug alignment and gap consistency, critical for reliable ignition timing and engine efficiency. Whether you're building a race engine, restoring a classic vehicle, or maintaining performance equipment, indexing washers eliminate guesswork and guarantee consistent spark plug positioning across multiple cylinder heads.

Engineered with precision tolerances, these Spark Plug Index Washers Flat Seat feature three thickness options—0.043 inch, 0.050 inch, and 0.064 inch—allowing technicians to achieve exact spark plug depth and indexing angles for maximum combustion efficiency. The 14 mm flat seat design accommodates standard spark plug seats while maintaining concentricity and preventing electrode deflection. MOROSO's quality manufacturing ensures dimensional accuracy across the complete set of 30 washers, delivering the repeatability demanded by engine builders and performance tuners who cannot afford ignition inconsistencies.

Professional engine builders, racing teams, and serious enthusiasts rely on indexing washers to standardize spark plug installation and optimize combustion chamber conditions. The included variety of thicknesses accommodates different cylinder head designs and allows fine-tuning of spark plug reach for maximum thermal range and performance. Installation is straightforward—simply select the appropriate washer thickness, position it under the spark plug seat, and torque to specification. These washers are essential for dyno-tested engine builds, competition vehicles, and any application where ignition precision directly impacts horsepower, fuel economy, and engine longevity.