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LS 415" Rotating Kit, "Ready To Run", Already Balanced, Lightweight 4340 Forged Steel Crankshaft 4.00" Stroke, 6.125" 4340 Forged Steel H-Beam Rods, w/ ARP 2000 Rod Bolts, Forged Platinum Series Pistons w/ Premium chrome Moly Wrist Pins & Upgraded Stainless Top Piston Rings, Clevite "H" Series Rod Bearings, "P" Series Mains, 58 Tooth, 4.080" Bore, Roughly 10.4:1 Compression