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3 Steps to Selecting a High Performance Plug:

1. Shell Design and Selection:

The first step is to determine the thread diameter, thread length (reach), hex diameter, and the type of seat design the cylinder head requires. Thread diameters can be 10, 12, or 14mm and thread length varies from .375" to .750". Hex diameters are typically 5/8" or 13/16". Cylinder heads use either a gasket type or tapered seat spark plug.
Shell Series Thread Dia Reach Hex Dia Seat Type
A 12mm .750" 18mm Gasket
BL or V 14mm .460" 5/8" Tapered
BN or S 14mm .708" 5/8" Tapered
CJ 14mm .375" 3/4" or 13/16" Gasket
DJ 14mm .325" 5/8" Tapered
DZ 10mm .500" 5/8" Gasket
FN or C 14mm .750" 5/8" Gasket
G 10mm .750" 5/8" Gasket
J 14mm .375" 13/16" Gasket
L 14mm .500" 13/16" Gasket
N 14mm .750" 13/16" Gasket


2. Heat Range Selection:

Heat range refers to the relative temperature of the spark plug's core nose. A HOT plug is typically used in a low horsepower engine while a COLD plug is designed for higher horsepower applications. The length of the core nose (insulator) is the primary way to adjust a plug's heat range. Hot or Cold refers to the spark plug's ability to dissipate heat from itself: a HOT plug transfers heat more slowly and has a longer insulator, which provides a longer, slower heat transfer path. A COLD plug transfers heat rapidly and has a correspondingly short insulator. The ideal balance in the heat range is a plug that prevents fouling but does not contribute to preignition or detonation.
3. Selecting Electrode and Gap Design:

Regular Electrode "C"
 Standard electrode and gap design-most common design used “CX” designates a “C” with a large cross section ground wire.

Surface Gap "V"
 No conventional electrode-operates extreme cold-designed for 11:1 to 15:1 racing applications- Ford and GM small/big block

Retracted Gap "R"
 Designed for applications with limited valve or piston clearance, or where boost pressures/fuel (blown/turbo) cause excessive combustion temperature

Cut-Back Electrode "JC4"
 Ground electrode is "cut back" to provide wide .040" gap- Intended for high output electronic ignition systems

Angled Gap "A"
 Angled ground electrode provides a more exposed gap-generally used for 14:1+ compression Ford & Chevy 18° asphalt oval track racing

Fine Wire Electrodes
 Fine wire center electrode requires less voltage-can more easily compensate for rich or lean conditions- excellent for a variety of applications

Projected Nose Gap "Y"
 Projects electrode .060" further into combustion chamber- provides maximum performance & broader heat range performance


   
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