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

							                        

                                                        
Projected tip for gasoline. For double hump heads. Most popular for IMCA Modifieds. Recommended for gas. 14mm   plug, .375" reach, 13/16" 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, .375" reach, 13/16" hex
Projected
Heat Range: Hot (59)
Champion Spark Plug Guide (GIF)
Champion Heat Range Guide (GIF)
Champion Conversion Chart (GIF)
Spark Plug Gapping Instructions (GIF) 
                                                    

						                        

							                        

                                                        
Champion Racing Series plugs include all the features of their  conventional plugs, but are built with extreme engine conditions and  durability in mind.  For GM & Ford cast iron cylinder heads and some  OE design aluminum heads. Will not fit GT40 heads. 
Nickel Alloy Ground and Center Electrodes
Copper Core Center Electrode Allows for Increased Conductivity and Heat Control
Peanut Plug
14mm, .460" reach, 5/8" hex
Projected Core Nose
Heat Range: Cold (59)
Champion Spark Plug Guide (GIF)
Champion Heat Range Guide (GIF)
Champion Conversion Chart (GIF)
Spark Plug Gapping Instructions (GIF) 
Autolite, Champion, NGK Cross Reference Chart (PDF) 
                                                    

						                        

							                        

                                                        For Brodix and other aftermarket aluminum   heads. For most magneto fired ignitions. Sprints and Late Models. 14mm   plug, .750" reach, 13/16" 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, 13/16" hex
Recommended for Alcohol
Projected
Heat Range: Colder (57)
Champion Spark Plug Guide (GIF)
Champion Heat Range Guide (GIF)
Champion Conversion Chart (GIF)
Spark Plug Gapping Instructions (GIF) 
                                                    

						                        

							                        

                                                        
For double hump heads. Most popular for IMCA Modifieds. Recommended for alcohol.  14mm    plug, .375" reach, 13/16" 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, .375" reach, 13/16" hex, with gasket
Recommended for alcohol
Projected
Heat Range: Cold (57)
Champion Spark Plug Guide (GIF)
Champion Heat Range Guide (GIF)
Champion Conversion Chart (GIF)
Spark Plug Gapping Instructions (GIF) 
                                                    

						                        

							                        

                                                        
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: Hotter (63)
Champion Spark Plug Guide (GIF)
Champion Heat Range Guide (GIF)
Champion Conversion Chart (GIF)
Spark Plug Gapping Instructions (GIF) 
                                                    

						                        

							                        

                                                        
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: Hot (61)
Champion Spark Plug Guide (GIF)
Champion Heat Range Guide (GIF)
Champion Conversion Chart (GIF)
Spark Plug Gapping Instructions (GIF) 
Autolite, Champion, NGK Cross Reference Chart (PDF) 
                                                    

						                        

							                        

                                                        
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: Cold (59)
Champion Spark Plug Guide (GIF)
Champion Heat Range Guide (GIF)
Champion Conversion Chart (GIF)
Spark Plug Gapping Instructions (GIF) 
Autolite, Champion, NGK Cross Reference Chart (PDF)