Mick, are you saying that even the NGK part code was identical? I thought that you meant that the plugs themselves looked identical, but that the part code was different. What was the number at the end? Does this match with the gap you measured? I'm not familiar with the 25thou you mentioned. Or is that 0.025 inch?
I'm saying that the part codes were different.
The original ones ............... and I'm sure the plugs I took out were the ones fitted from brand new were NGK 55233997
The new ones I've put in are NGK 55242187
Old and new plugs looked identical but the old ones looked old and tired of course.
The gaps I can only measure with Imperial feeler gauges because they are the only ones I have at the moment.
"thou" is short for Thousandths of an Inch.
ie 1 thou equals 0.001"
Old plugs were 31thou ............. conversion is 0.7874mm
New plugs are 25thou .............. 0.635mm
Conversions by courtesy of http://www.calculateme.com/Length/index.htm
Hope that helps.
Regards,
Mick.
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