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AC in AC Delco Spark Plugs stands ALBERT CHAMPION. Alberta Champion lost control of the Champion Spark Co in 1908 and then started AC Spark Plug Co. Ac was bought out by General Motors in 1909. Reference Wikipedia --Flint East
B5s
Champion RER8YC
Champion
Champion RJ18YC6
The laser 40500 Champion cross reference is for spark plugs. There are many cross reference data bases to show which spark plugs can be interchangeable.
The Champion spark plug rj19lmc should be able to replace j19lm. Many of Champions spark plugs are interchangeable with plugs with the same letter coding.
Champion rc12lcChampion rc12lc
Champion, which is what they were built with.Champion, which is what they were built with.
Use the same Champion plugs the factory installed.
It depends on the brand of plugs. If you use Champion plugs the gap is .035. You can check gap at Champion plugs or search another brand. Hope this helps. the gap is .035 on any plug you use.
Champion