I gotta throw my hat into the ring on this one....
...back in the early 70's....the O.S. .60 FSR was the
best, most powerful, longest lasting, and expensive
engine you could get. They came in a standard version,
or you could get 'em pumped and piped. Even to this
day....about the only thing that will out run 'em is
a Rossi....and I don't know if the Rossi would out last
one.

I ran an FSR for 15 years.....over 600 flights before I
had to rebuild it. Even then....the rod and the piston
were perfect. I replaced the liner, ring. brgs, and the
gaskets. Good as new.

If you look back at the "Full line" posters....of all the
wonderful engines O.S. made....it's hard to believe.
Take any decade...70's, 80's, 90's....and you'd almost
have to combine all the others to equal the O.S. line.

Their success was due to quality materials, quality
control, and their carburation. The .60 FSR had the 7B
carb....double needle....virtually every modern double
needle carb....to this day, is a copy of the O.S. 7B carb.

True, the liner peeling problem of the .46's was a bummer
and the Super Dog .91FX left a little to be desired....
but I guess you can't win 'em all. Their need to cut
cost's, and the coming of the Tiawan and Chinese
motors made for a few problems....

FWIW....the Jap rifles of WWII weren't that bad. True,
they were'nt the best. They did have problems with
their ammo....due to the rain and humidity of the
Pacific....and their corrosive primers and powder led
to the rapid deterioration of the rlfle bores and accuracy.

There has always been some confusion about the U.S.
military rifle designations....

The M1.....30 cal was designated for both the Garand,
and the carbine...(oh well)....they were adopted in 1936
and production ceased in the middle '50's.

The M14 took over in the middle '50's, and was used up
until the mid '60's....when the M16 (AR15) was introduced
in 'Nam.

The M1A....is actually a M14....

And the M1A1....is actually a M1 carbine.....with a folding
stock.

Ask any old timer from the military....they do that, just to
keep you confused....

Dave.