Another surprise.

Hi guys. I started a thread pertaining to this issue and got no answers on the last question in the thread. I appreciate your help and I wonder if any of you have experience with this?

I was trying to find some main cap bolts that would torque to stock Mopar specs to mount my kevko oil pan pickup. I settled on the Mancini racing windage tray attaching bolts. Listed as a Mopar performance part. Part number MOPP3690939.

When I received them I found that the washers that go between the main cap bolts and the main caps are not flat. They're convex. Obviously the other side is concave. I'm used to flat washers. For that matter there are no washers between the rest of the bolts and main caps. I have only used washers in this scenario when I switched to aftermarket bolts or studs and those were always flat washers.

It seems logical that I place the washers in such a way that the convex side goes against the bolt head. As the bolt torques down and the washer flattens it would seem to change loading on the bolts and therefore the main caps and block.

No information found anywhere from Mancini or my machine shop or any written source I can find about what the torque should be but the whole reason I bought them was to maintain stock torque because the block line bore came up straight and I want to keep it that way.

The answer to my original question was to torque the bolts to the stock 85 foot pound spec. Does this still hold true with the strange curved washers?

The advice I was given originally was to weld a smaller stud to the bolt head of the main cap bolt. I didn't do that because it seemed to me like the heat of welding would compromise the bolt.