Eagle Chevy 454 4.250in Crank 6.385in H-Beam 18cc Dome 4.280in Pistons Rotating Assembly

High-performance engine component kit for Chevrolet Big Block 454 engines with a 2-piece rear main seal. Features a forged 4340 steel crankshaft (4.250" stroke for 489 CID with 4.280" bore), forged 4340 steel H-beam connecting rods (6.385" length), forged aluminum pistons (-18cc dome, two valve reliefs, 0.03" oversize), and plasma moly file-fit piston rings. Engineered for internal engine balancing, but requires professional machine shop balancing of external components (flexplate/flywheel and balancer not included). Compatible with standard deck height (9.800") Big Block Chevrolet applications. Compression ratios: 10.7:1 (112cc), 10.2:1 (118cc), 9.7:1 (124cc).