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Astra H 1.6i 16v Twinport?

Can anyone tell me the recommended Spark Plug Gap. Not shown in user manual or more surprisingly not in the Haynes Manual? Have NGK fitted (very wide gap) but an replacing with Bosch.
Aidan Maguire, August 2015
Spark plugs come pre gapped now,just put the new ones in.

cdc, August 2015
link Click here to see other fixes for Astra.