What is the difference between a "base engine" and a "turn key engine"?

Answer 1

When purchasing engines, there is a short block, a long block and your "turn key"
The short block is just that, the block, no pistons or any exernal items. The long block is a finished engine block, with all internal components installed, usually requiring the external components like the starter, alt, intake, maybe oil pan etc.
A turn key, is pretty much a completely assembled engine, just add oil and connect up the hoses and wires when you install it.

Answer 2

as daremo said.......except a short block has all internal part,s.....such as crank,rod,s,piston,s,etc.......but no cylinder head,s,manifold,s,oil pan,etc........along block is more complete...but not everything.......a turn key engine is complete....just install,& add fluid,s,connect wiring,tighten thing,s such as mount,s,drive connection,s hose,s etc....& drive away...knowing every thing is new.

Answer 3

"Turn key" has it all. Drop it in, close the hood, turn the key and go.

Base you use your intake manifolds, alternator, etc etc