Quote: Awesome barely describes it & at 12.9 litre [787 cubic inches] its not quite half of the capacity of the big fellers, but probably delivers about 10 times the performance.
Does it qualify as an engine 'swap' if it is the original engine in a new made car?

Quote:
The M-47 was powered by a Continental AV-1790-5B, 12 cylinders, 820 HP, gasoline engine. [air cooled]

It's my guess from the designation that this is a 1790 cubic inch engine [29.3 litre] which beats the other two easily, but what is a 'Blastolene'?
Is it a car, & is it driveable? Can we see a picture to make it verifiable?

Edit
OK, i've now seen both Big Bertha & the Blastolene Special & man oh man, they are BIG, but again, is it an engine 'swap' if they are the original engines in a new made car [You call that a CAR?]