3) Valve adjustments should be done with the motor cold.
A12 valve clearance [Forum - Classifieds] : Datsun 1200 Club.10 and .12 would be OK if set when engine is cold ..
I have the Nissan A12 factory manual. It agrees with 1200rc:
intake: .35mm (.0138)
exhaust .35mm (.0138)
intake: .25mm (0.0098)
exhaust: .25mm (0.0098)
But Clymer and others say don't set it cold -- always Hot. When I used to do it, I did .013 in. cold, they were quiet. I always looked for a semi-tight fit (some drag, not loose, but not a really tight fit).