Specs. UHL 1.500" Eagle Rod Bolts by ARP Eagle genuine replacement rod bolts manufactured exclusively for use in Eagle rods by ARP. These are NOT offtheshelf ARP bolts . Silicon Bronze Pin Bushings Made from silicon bronze for oil retention and durability. Inside diameter will need to be finished to size before use. Chevy 400 Spacer Bearings Time proven design. This simple yet effective method to use a crankshaft with Chevy 350 mains in a Chevy 400 block. No machine work required. Just snap them in and snap a set of Chevy 350 bearings inside the spacers. V8 Moment Matched Bobweights VBlocks and setup weights are weightmatched to 1g for perfect balancing. This is the same bobweights Eagle uses for balanced assemblies. Reduces cap walk and main bore distortion under high load. Fits Chevy 2bolt register. Drill alignment dowel included. Bolts not included. Block must be alignhoned prior to use. Rod Cap Alignment Sleeves Precise tolerances to align rod caps perfectly. Sold each.