Champion 791 C57YC 14mm Spark Plug, .750 Reach, 5/8 Hex, 57 Heat Range

#271C57YC

Champion 791 C57YC 14mm Spark Plug, .750 Reach, 5/8 Hex, 57 Heat Range

Name: Champion 791 C57YC 14mm Spark Plug, .750 Reach, 5/8 Hex, 57 Heat Range
Brand: Champion
SKU: 271C57YC
Price: 5.99 USD
Availability: InStock

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Product Summary

Universal Fit, Gasket Spark Plug Seat Style

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Key Specs

MFG. Part #	791 C57YC
Brand	Champion

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Installation Details

Spark Plugs Instruction Sheet (271C57YC)

Performance Spark Plug Buyer’s Guide

Installation Tips

While 5/8" (16mm) and 13/16" are the two most common plug hex sizes, plugs can have a hex as small as 8mm or larger than 1".

If you're a tuner or engine builder in search of the perfect spark plug for your current project, pay special attention to the hex size required. Remember to take into consideration not only the diameter of the cylinder head, but also the added thickness of the plug socket needed for installation.

A spark plugs reach is calculated by the length of the threads. It is measured from the seat of the plug to the end of the threads.

It should be noted that the reach does not include the electrodes, or an extended metal shell. When custom-selecting a spark plug, the electrode length and projection should be included in the calculation when taking into consideration the clearance in the combustion chamber.

WARNING: Spark plugs with different seat types are NOT interchangeable.

Spark plugs with a flat seat must be used in engines designed for a gasket seal.
Spark plugs with a tapered seat must be used in engines designed for a tapered seal.

Use of an improper plug in an engine will result in engine damage.

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Champion 791 C57YC Details

Projected tip for gasoline. For Brodix and other aftermarket aluminum heads. For most magneto fired ignitions. Sprints and Late Models. 14mm plug, .750" reach, 5/8" hex.

Plug gap will depend on output of distributor and fuel being used. Most applications using methanol will be at .022" - .025". If your ignition sytem is a higher output, maybe able to go as wide as .030". Gas application should be .030" - .035". You should also consult manufacturer of distributor for their recommendations.

Champion Racing Series plugs include all the features of their conventional plugs, but are built with extreme engine conditions and durability in mind.

Nickel Alloy Ground and Center Electrodes
Copper Core Center Electrode Allows for Increased Conductivity and Heat Control
14mm, .750" reach, 5/8" hex
Projected Core Nose
Heat Range: Colder (57)

Item Details

.750" Reach, 5/8" Hex

Application

Spark Plug Application Chart

Charts

Champion Spark Plug Guide (JPG)

Champion Heat Range Guide (JPG)

Champion Conversion Chart (JPG)

Spark Plug Gapping Instructions (JPG)

Guides & Documents

Spark Plugs Instruction Sheet (271C57YC)

Performance Spark Plug Buyer’s Guide

Spark Plugs Guide/Document (271C57YC)

CARB Warning

For race/ off road use only

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

CARB warning

Champion 791 C57YC Specifications

KEY SPECS
MFG. Part #	791 C57YC
Brand	Champion

GENERAL
Spark Plug Seat Style	Gasket
Spark Plug Reach	0.75"
Thread Pitch	14mm
Insulator Type	Projected
Resistor	No
Spark Plug Heat Range	57
Core Material	Copper
Tip Material	Nickel Alloy
Wrench Size	5/8"
Sold in Quantity	Each
GTIN Code	037551005680