Pete is correct about needing a new engine mount and gear legs.
Also re-plumbing the brake lines
The other differences were at the F-611 and F-612 bulkheads.
The 612 was a single bulkhead member (would need to change to a double) on the 6A but you would have to remove it for the tail spring mount installation anyway so not a problem.
On the 6A the stab attach bars on the F-611 were tapered narrower at the bottoms for weight reduction and I think they were installed parallel to each other (instead of getting closer together near the bottom to match the tail spring weldment bolt locations). This would not work with tail spring mount, so you may have to also install a new F-611 bulkhead. This would require re-drilling the horizontal stab. attach bolt holes.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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