Eagle street performance kits offer the perfect balance of strength, performance and reliability. Each kit includes a cast steel crank, 5140 steel “SIR” I -Beam connecting rods with 3/8 ARP 8740 rod bolts, Federal Mogul hypereutectic pistons, plasma moly rings and Clevite 77 rod and main bearings. These kits are externally balanced and include a harmonic balancer and flexplate. Compression ratio is approx. 10.8:1 with 64cc heads or 9.6:1 with 76cc heads.