Arrow on 1600 piston set?

Still no sign o my Haynes manual but wondered which way the arrow on the pistons should face? T1 1600 twinport standard barrells and pistons. To flywheel or pully wheel?
Thanks

 

Flywheel

 

Thank you want to be sure . ;-)

 

If you live in an Arab country, the arrows should point towards Mecca...