Use reference websites such as SparkPlug-CrossReference.com, BriskUSA.com, BestCovery.com and AutoLite.com to view comparison charts, reviews and comparable part numbers for various spark plug brands. Some manufactures including AC Delco feature competitive cross reference search tools on their websites.
On SparkPlug-CrossReference.com and ACDelco.com, enter the brand and part number into the drop-down search menu to view a list of comparable spark plugs and statistics. BriskUSA.com provides a heat range chart for comparing popular brands including Bosch, Champion and Denso. This chart focuses on the combustion heat dissipation efficiency of the spark plug tip. BestCovery.com features reviews and comparisons of many spark plug brands and provides prices and links to Amazon.com when available.