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|Electrode Tip Material:||Resistor|
|Thread Diameter:||14 mm|
|Wrench Diameter:||5/8 in|
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Q:What is the difference between plugs part number 104 and part number 764? Will they both work on a 2003 Mustang GT?
A:Hi Customer, glad to help you! Both these spark plugs part numbers 764 and 104 is an exact fit for your 2003 Ford Mustang GT. The Autolite Copper Core Resistor Spark Plug (Part No. 764) is a non-projected insulator type spark plug and the spark plug reach is 0.807 inch whereas Autolite Racing Copper Core Resistor Spark Plug (Part No. 104) is a projected insulator type spark plug and the spark plug reach is 0.708 inch.
Q:How often do these need to be changed out in comparison to platinum (doubles) or iridium spark plugs in a 1997 Pontiac Grand Prix GTP?
A:That is dependant on the application and condition of the engine. High revving engines, driven hard, will wear plugs much more quickly than a large engined car which is used for cruising. Standard copper plugs usually have an estimated service life of 10,000 to 20,000 miles depending upon design and application.