RE: fpe 5.8 with the shakes...
RCIGN, Ralph, when are you going to learn that all your years of trial and error and experience don't mean anything to all the RCU experts. Golly Gee let the guy put that shaker in a plane and watch how long it takes to start shedding parts. Maybe even set it to music.
"might a been the firewall, might a been a wing. might been a tail surface goinin, now look at the mess I'ts in" (some country song)
My test stand is 1/4 thick base bolted to the floor, welded to that is a 4"diameter pipe with 4 1" gussets 12"long verticle, pipe is 1/2" thick wall, 40"long to a table 6x12x1, which has a firewall 6x6x5/8".
It don't take long to find if a prop, crank or ignition isn't right. I would strongly suggest to the 5.8 owner to check his timing, trouble is the hub is keyed to the shaft and the last time I checked if you wanted to check the timing, FPE said send it in. Maybe that has changed.
Now yu'all member Ralph, experience don't mean nuthin on these forums. he,he,he,he