The plugs i took out had a massive gap, the new ones are tiny, dont think i had any issues with the last ones just changed them due to not knowing when they were done last. Dont have any feeler guages, so i googled the thickness of a credit card 0.76 mm, and it doesnt fit in the gap so im guessing they have come gapped at around 0.7mm Think ill gap them to 1mm then