I can only imagine what kind of cheap crap they used to build one for that little.

Block = 2nd grade $500 = grade 1 $900
Forged rods = $500
Forged pistons and rings = $600
Forged crank = $800
Bearings = $250 for good ones with steel backing, not el-cheapos
Cam bearings = $30
Main studs = $150?
machine work, deck block, bore and hone, align hone crank, assemble... would you do it for $2800 or buy one knowing how cheap of parts they must be using?