Think about it, that Bugatti engine has the cylinders and head as one solid, machined piece of metal. No cylinder and separate heads, no chance of blowing a head gasket, because there isn't one. A bitch to machine and service (imagine changine or resurfacing the valve seats), expensive as can be, but truly amazing engineering by one of the greats of automotive engineering.
Bugatti was a total freaking mechanical genius. Period. The more you study his designs, the more you get absolutely blown away. If you look at the Type 59 rear suspension, you may realize it has built in passive rear wheel steering.
http://www.guildclassiccars.com/1933_Bugatti.html
There is a very good reason why "Bugatti" is a respected and hallowed name in the history of motor racing.