240Z, 260Z, 280Z Performance / Technical Discussions related to performance motor enhancements, upgrades.

Spark Plug Gap

Old 07-05-2005, 06:58 PM
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Spark Plug Gap

Might be a really stupid question, but I'm working with a Haynes Manual that has all of one chapter on the early 280-Z's. Is the Chiltons any better by the way?

Ok, bear in mind we're dealing with a 76 1/2? (Off the line mid way during the 76-77 production run going by the VIN).

Haynes describes the gap for the 240/260 as between .30 and .35

It further described for 280's, 1977 and later, as .34-.39 (or there abouts).

I'm not real familiar with the 260's, but I know that they were all carborated, yes? And there is really no difference between my '76 engine and a '77 except for a/c and some emissions and possible a five speed tranny (I have four).

For the moment I'm running with the smaller gap range, any suggestions as to what is best?
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Old 07-06-2005, 07:17 AM
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You still have a 280 so go with the .034-.039. The more books you have, the better.
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Old 07-06-2005, 08:39 AM
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ok, thanks. Apparently 76 is the bastard year for the 280's since they didn't quite come into their own until 77.
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