Our AS-410 has 465 Hp and is an inverted V-12 of 729.2 cubic inches.
Our AS-10 has 240 HP and is an inverted V-8 of 772.9 cubic inches.
So the AS-410 displace a bit less, true, but spins at 3,100 rpm as opposed to the AS-10's 2,000 rpm. Since any internal combustion engine just an air pump, 1/3 more rpm trumps -~8% displacement in this case.
However, they share some parts as well as an almost identical design, making the AS-410 ... in my view ... a 12-cylinder version of the AS-10 design, albeit 10 years later. Same configuration and some interchangeable parts, and looking rmarkably alike. Not EXACTLY the the same except for cylinder layout, but darned close.
I'm not really wondering about the AS-410 as it is running just fine
I'm trying to get some data to help with the overhaul of the AS-10. Otherwise, it's overhaul by "discovery."