This is the NGK spark plug that not only has a wide range of applications, 850cc to 1275cc+, but also a very wide heat range. This is an ideal plug for all street applications. also fits the Sprite, MG Midget , and Morris Minor. Resistor spark plugs prevent electrical interference that can disrupt car radio reception, two-way radio and cellular phone operation. This type of spark plug also prevents electrical noise from interfering with the operation of the computer in the engine. Specs below:

Torque Specs: Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.

• Trivalent metal plating provides superior anti-corrosion and anti-seizing properties
• Corrugated ribs prevent flashover
• Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer
• Copper core aids in heat removal
• Triple seals prevent leakage

The BP7ES plug is for higher compression engine that should have a colder spark plug. The engineers explain that it has to do with flame temperature and overheating the plug. I know from experience that my race engine will melt a street plug! Choose from the following NGK plugs:
Cold Street=BP7ES
Colder Street=BP8ES
Cold Race=BP9EV
Coldest Race=BP10EV

Very cold running spark plug that is often used in racing applications

These NGK spark plugs are just the thing for A-Series race engines. They're very cold, for use with 12:1 & up compression, and feature NGK's special gold palladium fine tipped electrode.

NGK Standard Types Spark Plugs

Copper core NGK spark plug with recessed nose for high compression engines.

NGK Standard Types Spark Plugs BP10EV
Design Symbols used in NGK Spark Plugs
B - Thread Size / Hex Size: 14 mm / 13/16" (20.8 mm)

P - Construction: Projected Insulator Type

Heat Rating Numbers : 10

E - Firing End Construction: V-Grooved Center Electrode (14 mm only) 1/5 mm Insulator

V - Firing End Construction: Fine Wire Gold Palladium Center Electrode

GK Standard Types Spark Plugs BP10EV
Design Symbols used in NGK Spark Plugs
B - Thread Size / Hex Size: 14 mm / 13/16" (20.8 mm)

P - Construction: Projected Insulator Type

Heat Rating Numbers : 10

E - Firing End Construction: V-Grooved Center Electrode (14 mm only) 1/5 mm Insulator

V - Firing End Construction: Fine Wire Gold Palladium Center Electrode

A standard NGK plug

These NGK spark plugs are just the thing for A-Series race engines. They're very cold, for use with 12:1 & up compression, and feature NGK's special gold palladium fine tipped electrode.

Stock spark plugs for use with alloy 7 port cylinder head. This is an 8mm spark plug.