I'm getting ready to put on a Harmin Marine engine mount and the size of these 5/16 timing cover bolts seem very twinkie. I measured a depth of between 5/8 and 11/16 of threads and about 3 1/2 overall length under the head of the bolt. So I'm looking at getting some 4 inch length stainless socket cap and cutting each one down to get max threads with a washer and lock washer.

  What seems messed up is the holes through the motor plate and the timing cover have what I consider a lot of play. It almost looks like it could call for a special shouldered bolt to take out the extra movement.

  Just wondering what everyone else has been using on their BBF front mounts?

  What about studs with a beefier thread at the cover? Do they make them?

  And what would be a good torque spec on the motor plate?

  What about stainless?

Not to contrdict you Nordie, but I used the stainless, and they been there 5 years now

Not overkill imo, I was just thinking rust, is why I went stainless.  Was my first jet build, and every freaking bolt or plug was rusty on the thing when I got it. Wasn't thinking strength then, but was a little aprehensive when I put it together with those chickenshit little long bolts tho

  What about something like these?

  Anyone use anything like this shouldered bolt?

  I ended up buying the stainless at 4 inches in length, threaded them in all the way, with the mount on, measured the slack between the head and the front of the plate, and cut each one down so that with a washer and lock washer I will be grabbing maximum threadage. Sort of custom like.