The engines in post # 9 are BPM V 12 engines
They are manufactured in Italie,same company as the BPM drives,the engines they produce are 1 litre per cilinder ,they have a V6 ,V8 ,V12 ,all are all aluminium ,block&heads,oil pans etc etc, I believe those v12,s were rated at 680 hp back then ,not 100% sure.
All engines have hemisferic style heads