Continuous design improvements and improvements in materials and manufacturing techniques have resulted in Eagle being the largest and most respected aftermarket connecting rod and crank manufacturer in the industry. We never stop researching ways to make our products lighter, stronger, more efficient to manufacture, and more diverse. When you stop moving forward, you get passed by the competition. The Street/Strip assemblies consist of Eagle "ESP" cast steel crankshafts, Eagle "SIR" I-beam connecting rods, forged or hypereutectic pistons, moly piston rings, and rod and main bearings. Chevrolet 350 2-piece rear seal internally balanced Rotating assembly.3.7500" stroke, 5.700" I-beam connecting rods, Hypereutectic Keith Black -7.0cc Pistons.