question about spark plugs.....

[IsaacHayes]

Different models can have different heat ranges, length that the plug sticks into the combustion chamber, etc.

[jonbourg]

Different models can have different heat ranges, length that the plug sticks into the combustion chamber, etc.

Not what I meant. NGK's website as far as I can tell does not give specific information as you describe above. Therefore it was not possible to answer the other person that asked about the differences between two different models. NGK does give a nice description of what plug heat range means, but I didn't see anything on their site describing what the heat ranges of their different models of plugs were.