For what it's worth NGK's 4 digit numerical part number exists as a
solution to the problem of how computers sort lists versus the way the
spark plug part numbers are formatted. As the information coded in the
actual spark plug part number became more complicated the P/N got longer
and became inconsistent in it's make-up . The advent of computers
keeping inventories , being used to print lists , store drawings etc.
created a problem with sorting. The simplest most efficient cure at the
time and going forward was to assign each descriptive part number a
simple numerical code. This got them around a computer's inability to
sort by anything but physical position. it is something all the plug
manufacturers have done for the same reason. Plugs will still have their
B (long thread) P (projected nose) R (resistor) 6 (heat range) etc.part
numbers so you can tell what they are.
Thanks,
Durf
racery@comcast.net wrote:
> Actually-
> BP6ES plugs have had the '7333' stocking number on the box of four for some
>time now.
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