Cast Iron R3 Race Engine Block

Power and durability. That's the Mopar racing heritage, and these engine blocks are a welcome addition to the racing family. Built with the latest in design technology, the R3 Race Engine Block comes with all the hardware you need to take your race vehicle into the stratosphere. These blocks include:

• Process-controlled castings, using high-strength cast iron
• 100% CNC machining
• Thick deck surface and six bolt cylinder head attachment
• Rough bore at 3.900", with overbore capacities up to 4.220"
• Four-bolt mains in ductile iron and billet