Perhaps it was morphed into the current 4.6L 3 valve 330 HP V8 use in the Mustang, albeit with a single cam?
I vaguely... and I do mean VAGUELY recalled the Calliope..
>
> So, I Googled "427 Calliope" and found there is some good info "in the > wild"...
>
> I do recall the dual camshafts... Two cams IN THE BLOCK in an over under
> configuration - mistakenly considered a DOHC arrangement by some. >
> The history of the Ottocycle engine is filled with amazing and wonderous
> ventures and adventures... Pioneers like Zora Duntov, Smokey Yunick, Dan
> Gurney, Offenhauser... too numerous to mention all of them. It is
> reasonably safe to say that any idea one of us may dream up has already > been tried...
>
> Anyone remember the Chrysler "free piston" engine? How about the Bourke
> engine... anyone realize people are still trying to redefine some of the
> oddballs? Who has seen the crank arrangement on a radial engine? How about
> that there are two different styles of rotary engine (at least). >
> This stuff is amazing, all the same.
>
>
>> In the late 60s developed a 3 valve 427 with two camshafts, one above the
>> other. Two of the valves were intake one exhaust and operated off the top
>> camshaft. It had 16 individual intake runners. One version had a oval or
>> oblong valve, for lack of a better description, intake valve, that had
>> two stems operating on the same layout.
>> The engine was called a Callope, or something similar, 427. It was
>> developed for LeMans, I seem to remember but was only used, in testing
>> possibly and was outlawed.
>> My recollections are from hot rod magazines,of the era possibly Popular
>> Hot Rodding.
>> Has anyone ever come across this engine or have access to articles on it? >
>