Buick Experimental Engines
The Buick Nailhead on the bottom right was "brutal".
Supposed to make about 750 ft-lbs of torque and 550 horsepower. Never made
it into production since Buick couldn't get a transmission to last behind
it including the TH400.
One of the 2 experimental 4 bolt main blocks cast by Buick.
See the article on the site for more info.