Wha is required to rebuild a 2.5L Engine?
 

I need a new "Block." Mine has Hole in Piston, looks like this http://i635.photobucket.com/albums/u...i82/CARPIS.jpg

Im looking at used 2.5L Engines and Blocks.. or should i just buy Parts? What does the Mechanic need to do to "Replace my Pistons?"

Application: 1991 Oldsmobile Cutlass Calais 2.5L "Tech4," Vin "U"

Thanks!!