View Here : E3 Spark Plug Cross Reference
Funny,I was watching "GEARZ" THIS MORNING BEFORE WORK.They were doing up a vette to give away.It had turbos,etc. and E3 plugs for more hp.I was going to ask about those and the design they have which looks different then the other plugs.
This cross-reference numbers furnished as a guide . Due to differences in design, material, etc, plugs produced by various manufacturers do not have exact the same heat range.