from memory its 14thou intake and exhaust
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It is a over head valve engine with a timing chain.
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0.030mm or .12
Nissan L18 valve clearances (hot) are: inlet - 0.25mm exh. - 0.30mm. For the guys in the USA this is 10 thou and 12 thou (inch) Syd - South Africa
Both Exhaust & Inlet Clearances are 0.30mm = 0.012"...or..12 thou HOT
a lot of noise when the clearances were allowed to be become excessive in the valve clearance.
the valve clearances is 3000 of a ince
With out specific specific year, applicaton (car, Utility van etc) and country of sale this answer can not be answered.