Stock Bottom End 

"Stock bottom end" refers to a engine thats rotating assembly such as pistons, rods, and crankshaft of the motor are stock or are untouched from the factory.

Guy 1: My whip makes 800 wheel on stock bottom end.
Guy 2: Bullshit man
Guy 1: 2jz brah

Stock Bottom End by bayonet262 April 5, 2017

Stock Bottom End 

Slang term to describe a built race engine.

That green camaro with the crybaby drive has a Stock Bottom End yo.

Stock Bottom End by Boosting12 October 1, 2007