Rich, I yield to your greater knowledge of the engines. Now that you remind me -- I think that indeed, I should have said 16V92. Maye the "2" in that label is what caused me to modify the 71 into a 72. Whatever, I'll go with your idea 'til someone comes along with definitive proof. Thanks.
Maybe I'll go Bing-ing and find out what I find out.
I've found some stuff. The 16V92 is the biggest model available in the 72 cu in/cylinder size, which runs from 4 through 16. Taking a look at the engine's line drawing I see what might have got me going in the wrong direction, though - - there are four heads, just like Rich said, bolted onto one block. The two heads end-to-end threw me off track, into thinking that a pair of engines was tied together.
Interesting is that the 1472 cu. in. engine is rated at 1350 hp at the shaft at "maximum" and 1254 hp at "intermittent-maximum". But neither of those numbers is enough to power the Phoenix or Joint Venture to well over 200. Anyone remember if there were/are estimates of the horsepower output of either of the engines? We can go back to sidecar roadsters if you'd like, by the way.
