National 100058 Ignition Distributor Seal

Ignition Distributor Seal for GM V8 Applications

The National 100058 ignition distributor seal is built for distributor and magneto service where a precise sealing surface matters. With a 2.156 in. inside diameter, 2.885 in. outside diameter, and 0.375 in. thickness, it is sized for a controlled fit in the distributor assembly.

Compatible With 1995-1997 Pontiac Firebird, N/A; 1996 Buick Roadmaster, N/A; 1994-1996 Chevrolet Caprice, N/A; 1995-1996 Chevrolet Corvette, N/A; 1994-1996 Chevrolet Impala, N/A; and 1994 Chevrolet Commercial Chassis, N/A. National 100058 is a direct-fit ignition distributor seal for these listed applications.

Key Features

• Inside diameter: 2.156 in. / 54.760 mm
• Outside diameter: 2.885 in. / 73.280 mm
• Thickness: 0.375 in. / 9.530 mm
• Designed for ignition distributor sealing service
• National part number 100058 for catalog and service lookup
• Cross-reference: 12552428 for the same application

Detailed Description

National 100058 is an ignition distributor seal engineered around the dimensional requirements of the distributor housing. The seal’s measured inside diameter, outside diameter, and thickness help support a proper sealing interface in GM applications such as the Chevrolet Corvette, Chevrolet Impala, and Pontiac Firebird. National has focused on sealing solutions for decades, and this part reflects that experience in a service component sized for accurate replacement work.

Use National 100058 when servicing distributor sealing points on the listed vehicles. The part number 100058 is also helpful when matching service records, catalog listings, or interchange references during ignition system repair.

What It Helps Address

• Oil seepage around the distributor base
• Loss of sealing integrity at the ignition distributor housing
• Replacement of a worn or flattened distributor seal
• Service work on GM ignition distributor assemblies
• Parts matching for National 100058 and related interchange lookup

Installation Notes and Tips

Confirm the distributor seal dimensions against the original part before installation. Clean the sealing surfaces thoroughly, inspect the distributor housing for wear or scoring, and seat the seal evenly to avoid distortion. For best results, verify vehicle application by year, make, and model before ordering, especially on 1994-1996 Chevrolet Caprice and 1995-1996 Chevrolet Corvette applications.

Quality Assurance

National is known for sealing products and has supported the industry with premium sealing solutions for more than 75 years. The 100058 distributor seal is backed by that manufacturing focus and is intended for the listed fitments, including Buick Roadmaster, Chevrolet Impala, and Pontiac Firebird service applications.