Build Sheet Block: World Merlin III cast iron, Merlin X Aluminum Crankshaft: Eagle 4340 crankshaft (Callies 632) Main Caps: 4-bolt (ARP main bolts) Bearings: Clevite H-bearings Connecting Rods: Eagle H-beam 4340 Pistons: Mahle coated Piston Rings: Total Seal Balancing: Digital (internal balanced) Freeze Plugs: Brass Finish: Painted