Smoother engine, more power and efficiency. New and balanced. All pistons balanced with new piston pins in order to assure a smoother more reliable engine with less stress on the crankshaft. The exact same piston dome to cylinder head clearance on all cylinders assures combustion chamber volume is identical for all cylinders resulting in uniform power output for each cylinder. Maintains correct piston pin clearance.
Large end maintains correct rod bearing to crankshaft clearance.
Balanced to within 2 grams to make a smoother running engine. Less stress on the crankshaft and other moving parts. Part of blueprinting. Better oil flow, oil pressure, increased reliability and longevity of engine. Results in dramatic reduction of friction and wear, smooth idle and elimination of brass bushings.