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What amount of stiffening would an engine plate provide? If any?

Engine plate

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If you run it with rubber bushings...No stiffening at all.

You can make it a stressed member if you integrate it into to the cage and frame. Needs to be basically locked and pinned in place. IMHO, not just typically bolted in place. Both holes need to ride tightly on the shoulder of the through bolt and fits so tight it needs to be tapped in.

And the thickness of the Magnum Force place is too thin for a stressed member.

Here's one we build that was fairly stout. We were in mild accidents and it bent the plate. That was sort of a downfall of the plate.



IMHO, this is a little thin on the chassis tab. but there is a lateral support gusset that you can't see.