Spark plug gap on 280z?

[PUSHER]

What should my spark plugs be gapped at for a stock 280z? thanks.

[Zedrally]

Hi pusher,

what plugs are you using?

FYI the search function doesn't return an actual value!

[gema]

Invest in a Factory Service Manual...

[PUSHER]

They are NGK br6es spark plugs, I did a couple of searches but couldnt find it. If you could help me out id appreciate it.

[2ManyZs]

.030-.035 is pretty much the standard plug gap. With the electronic ignition you should probably go to .035, even a little more than that if you've done any upgrades to the ignition like a hotter coil etc....

[PUSHER]

Thanks.

[sblake01]

The FSM says .039-.043 but they also add .028-.031 for Canada.

[venom42]

I have both, Haynes and Chiltons, service manuals. Both list gap for '70-'76 as .030-.035 and '77-'83 as .039-.043. Is this correct? How is it that the FI engines from the '75-'76 would want the same gap as with carbs? I have a '75. When I checked the plugs, they are all gapped at .041-.042. The car seems to run fine (even on regular 87 octane). I tried gapping them at .035 for a few days and it seemed a bit down on power, and my fuel mileage dropped 4-6 mpg, so I put them back. Should I change back to a lower gap?

[venom42]

anyone know if the gap is supposed to be different for '75-'76 cars than from '77-'78?