The LE5 is built on the older Gen-II block, with changes made over time. For instance, the connecting rods were forged steel, now they're melted powder (sintered metal)--despite what the book says, the LE5 does not have forged internals. The crank is cast, connecting rods are actually really good for being sintered, and the pistons are hyperteutectic (awesome technology). With the foamy appearance of the engine block and porosity (voids), I made the conclusion they went to sintered metal for the engine block also--I was wrong and the casting is lost-foam--my bad, and thank you @Batshot for the correction:
Real engine builders (who are not me) have said the foam casting process has known shortcomings in the LE5's production history, mainly resulting in thin walls on occasion which blow out under normal use, resulting in coolant leakage. Putting a forced-induction system on an engine that hasn't been checked for defects (see the above quote) can result in rapid decompression of one or more engine cylinders (your engine blows up).
It seems we got to the same result, but the correct way, which is important to understanding why things go wrong and how to minimize that from happening. Thank you again @Batshot for the correct information.
