The stock LS1 crankshaft is a remarkably stout piece. We have seen some seriously abused nitrous engines with all manners of broken components, but have yet to see or hear of crank failure. Knowing this, and that this engine was destined to remain naturally aspirated, ARE offset-ground the stock GM crank for a little added displacement. This upped the stroke to 3.7-inches and the final displacement to 393 cubes. Agostino Racing balances every reciprocating unit before final assembly. This was especially important for this engine, which will regularly see 7,000 rpm. Federal-Mogul main bearings were installed with .0026 inch of clearance.