Yes, a heavier engine would give more rear weight. Whether that is a problem or not depends on how far back that weight is centered, and by the magnitude of the change. It would be very hard to change, the engine/transmission position is fixed, so what do you move forward to add weight there? Lead bars would add weight to the front, but obviously not be beneficial to overall performance!
I was simplifying on the effects of WD on handling, stating the most important reason, polar moment of inertia is another important benefit af a mid-engine installation. They write whole books on the subject, too much to get into here!
steve
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