NGK BPR7EIX Iridium IX Spark Plugs 4055 – Set of 4 Plugs

Upgrade your ignition setup with this set of 4 NGK BPR7EIX Iridium IX spark plugs, stock number 4055. These heat range 7 plugs are commonly used in performance, modified, and higher-load engine applications where the correct plug design, heat range, and gap are required.

The BPR7EIX features NGK’s Iridium IX design with a fine-wire 0.6mm iridium center electrode, tapered-cut ground electrode, solid copper core, and trivalent metal plating. The fine-wire iridium tip helps provide a stable spark, while the tapered-cut ground electrode helps reduce quenching for improved ignitability and throttle response.

The copper core helps with heat dissipation, and NGK’s trivalent metal plating provides corrosion resistance and anti-seizing properties for easier installation and removal. This listing includes 4 spark plugs, making it a convenient set for many 4-cylinder applications that require NGK BPR7EIX / 4055 spark plugs.

Features

• Genuine NGK Iridium IX spark plugs

• Part number: BPR7EIX

• NGK stock number: 4055

• Sold as a set of 4 plugs

• Manufacturer heat range: 7

• Fine-wire iridium center electrode

• 0.6mm iridium tip

• Tapered-cut ground electrode

• Solid copper core for heat dissipation

• Trivalent metal plating for corrosion and anti-seize protection

• Resistor type plug

• Gasket / flat seat design

• Common performance plug option for modified, turbocharged, and higher-load applications

Spark Plug Specs

Part Number: BPR7EIX
Stock Number: 4055
Plug Type: NGK Iridium IX
Thread Size: M14 x 1.25
Reach: 19mm / 0.750 in
Hex Size: 13/16 in / 21mm
Pre-Gap: 0.8mm / 0.031 in
Seat Type: Gasket / flat seat
Heat Range: 7
Terminal Type: Removable nut
Resistor Type: Yes
Center Electrode: Iridium fine wire
Ground Electrode: Nickel tapered-cut electrode

Important Fitment Note

Confirm vehicle fitment, spark plug heat range, reach, terminal type, and gap requirements before installation. Spark plug selection can vary based on engine type, modifications, fuel type, compression, boost level, ignition system, and tuning setup.

What’s Included

• 4 NGK BPR7EIX Iridium IX spark plugs

• NGK stock number: 4055