I ask for tight and when the cam shows up,,I look at the card for the recommended lash.

That was exhaust intake I set at 0 on all tight lash solid rollers cold

If setting cold u subtract .006 with aluminum heads? I always have. I know it's best to set when hot but seriously how many people really do that in real world. Especially in marine applications.

I would rather have a .030 lash cam and be able to catch it before zero. It don't mater tight or loose grind as long as its smooth running. My new cams are .030 from bullet.. And so post to live Recommended from MK.
Just used MK for a magnet. LOL

Think its - .005 intake And -.007 for exhaust..

Have you used the cam in discussion in an NA by chance? I've heard 540 plus engines like it but no first hand knowledge of.
Tks
John

From the owner's manual;

900 SC Mechanical Valve .016 cold; .020 hot.

That throws a little monkey wrench into things. assuming it's the same cam/lobe why the .010 diff unless there is something else. Also I would think merc uses a custom crane grind vs the bullet grind. Still why the difference in lash? lobes maybe slightly different I would guess.