sentences:  In the sixth series the master connecting rod and the crankshaft cheeks were strengthened, the pistons were lightened and shortened.For the seventh series exhaust valves with floating seats were introduced and the reduction gearing was improved.The displacement of the ASh-73 ended up being slightly larger than the Wright Duplex-Cyclone radials of the B-29 - while having the same cylinder count and basic layout, the ASh-73 possessed a 58.122 liter (3,546.8 in3) displacement figure, some 6% larger than its American contemporary's 54.86 L (3,347.9 in3) displacement figure.