Well Andy, they could be?
And that's exactly where I'm at, a lot of educated guesses, but no definites...grrr!
I've found Twin-Wasp maintenance manuals, and yes they 'explode' the engine, but does not show that disc/intake etc.
I've emailed the C.A.F several times, about LB30/GRI Diamond Lil, as it originally had the early engines with those discs. DL doesn't have those discs on the engines now, so either they've down rated the engines by removing the superchargers (if that's what the discs are part of), or changed the engines for another type, but I've had no reply from them.
And yes for possibly something in the future....
Cheers
Shessi
ps Please keep looking and suggesting folks! ta.