Nope they were radials.
3 × Piaggio P.XI R2C.40 radials, rated at 1000 hp (745.49 kW) each.
or
3 x Piaggio P.XIX RC 45 radials, each rated at 1,175 hp (875 kW).
In fact this could be one of the first 3 versions of the CANT Z.1007bis Alcione. The first 3 had a traditional tail like the one above but the next 6 versions had a double vertical tail like the Lancaster and B-24 for an improved field of fire from the rear.
But again I am still not sure though. The bottom of the fuselage also looks different form 1007's that I have seen, but that also could be because of hte people standing around the area where there is a slight slant upwards in the fusulage underside.