Dave (and Dan McE) - that's LEW Woolard who does the Silver Foxx 40 small-case, banjo-back rework. (Maybe I'm just sensitive about how the name is spelled: Lewis is British, Louis is French, and down here near the Mexican Border, Luis is Spanish... The origins of the spelling, anyway. Today we aren't tied down so tight. But LEW is the Silver Foxx guy...
(I've heard that he may not be much into computers, so a phone call might reach him easier. He should be in the PAMPA directory.
(He's also seen many years, even more than I have and that's a lot...)
Anyway, I've never seen a description of the Silver Foxx rework by Lew but there was an article in the Sep/Oct '95 Stunt News by Neville Palmer, which details what Lew said he does.
He retimes the sleeve by turning off a smidgeon (precise amount determined by the engine in your hands) from the underside of the flange to lower the entire sleeve. Then he raises the bypasses to a specific distance from the flange underside just so, and tailors the exhaust port timing just so, to the numbers he has found to work.
He also changes the combustion chamber 'bowl' to reduce compression ratio just so for the desired results. ...and to reduce the 'squish band' width.
The "timing numbers" work out very nearly the same as I've been using, developed independently, for Stunt 35s since about 1990, by the way. (The Stunt 35 flange is too thin to 'drop' the sleeve sufficiently, so I lower the casting deck, instead.)
He includes break-in, fuel and prop recommendations. His method has created the well-regarded Silver Foxx mod.
Fox did not offer ABC sleeves and pistons at the time, but the operating factors do not change with the metallurgy. It should be just as valid for ABC as for 'iron in steel' Fox engines. The biggest difference may be that a well-broken-in ABC small-case Fox 40 shouldn't need as much total oil, and should live nicely on a 50/50 castor/synth fuel - like almost all current AB? engines - of about 22% total oil.
I have a copy of Nev Palmer's Stunt News article, and can probably scan it to an Adobe PDF, if you'd like the full deal. Lemme kno?