The Miller/Offenhauser Marine V16 engine...in Miss America
1916 Curtiss engine on 1918 Miss Detroit III boat
Jaguar V-12 dragster
cruise ship engine room tour - Google Search
Just your typical WWII Sherman tank Ford V8: 1100 cid, 525 hp and 1000 ft-lbs of torque! (The Mitchell Collection, Montgomery, Texas) Full details on this monster here: http://en.wikipedia.org/wiki/Ford_GAA_engine
tucker crate engine - originally designed for a helicopter, it was way ahead of its time.
Marine Power. Gar Wood's Miss America X, 4 Packards putting out 6,400hp. (the WWII PT boats had 3 Packards).
Bugatti Veyron engine block. Enjoy :)
OUCH!!! when piston pressure exceeds block wall strength, I would say they reach the limits here,... time to back off a bit guys.