The "big end" is the "big end" of the connecting rod--the rod that connects the piston to the crankshaft. The notion being that you just leave the round part of the rod that goes around the crankshaft, and that's it. You have to be careful, though, as I'm not sure how much clearance there is around the crank throws. It'd be bad to have the left over bit of rod smashing the inside of the engine...
-soD
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