Good morning boys and girls.....hopefully an easy question today, lol. I am about to mount my J35A8 on an engine stand. The 2 holes at the top of the motor are blind, and I will be needing to get the right size bolts for them, as I want them in good shape for re-installation at a later date. I THINK the upper most 2 holes are 11 MM X 1.5 pitch-but Im not certain. I used a pitch gauge, and lightly threaded a tap into these holes, but I would really like to get some verification from someone who knows more than I do (my wife says EVERYONE knows more than I do-but thats another story...lol) about these things. Any information would really be appreciated.
THANKS!!!

 

Isn't a M11 bolt very unusual? I couldn't find the top view of the engine, but bottom bolts are like those:





Most likely M12x1.25.

Or M10x1.25 is another common thread size. I don't think you will find M11 anywhere.

 

Yes-that was my thought exactly-11 is a weird size. And that is exactly my issue-the 12 mm tap was unhappy about threading into those holes, and I decided not to force it-and that brings us to today and my question lol.

 

M12x1.25

bellmetric.com, to answer your next question.

JIS Flange Small Wrench class 10.9 to answer the trailing question.