If it helps much, I've got SEVERAL Fox .35's, .15's and .19's that I fly my CL planes with - all are from the early 1970's to early 1980's and all still run fine. About every 3 years or so I have to make new gaskets for the rear of the engines though - they don't seem to last long, and never have.

When they were new, mufflers weren't anywhere near as common as they are now. Most of the engines don't even have a muffler mounting capability. What I did was to buy mufflers (mostly the old Tatone "tuned pipe" type) and strap them on using pipe straping that you screw tight. They've held for 30 years and are all still working fine too.

Fuel tanks for CL: the RC "clunk" tanks work just fine - I've got 6 on planes right now, from 4 ounces to 8 ounces (depending on engine size). I've also got a few of the old metal tanks, 4 on planes, maybe a half dozen in my "goodies" box - most are 6 ounce.

The metal tanks have one advantage (for me) that clunk tanks don't have - I can shut down the plane engine any time I please by simply putting the plane in the tight circle directly above me. This drops the centrifugal force on the plane to near zero and the fuel that's still in the tank falls away from the pick-up. Engine stops and I just glide down for a landing any time I want. You can't do that with most clunk tanks, only with the metal ones.

If you want to send a PM, we might be able to get together on these tanks.

Dave W.
Flier from the old school