Description: Heritage blocks for your Mopar. Mopar Performance Parts builds on their heritage with these cast iron A engine race blocks. These R3 family race blocks offer the latest in design technology, along with options to meet your specific needs.Features include:* Process-controlled castings utilizing high-strength cast iron and a computer-controlled stress relieving process* 100 percent CNC machining with full statistical process control*(more)

Description: Heritage blocks for your Mopar. Mopar Performance Parts builds on their heritage with these cast iron A engine race blocks. These R3 family race blocks offer the latest in design technology, along with options to meet your specific needs.Features include:* Process-controlled castings utilizing high-strength cast iron and a computer-controlled stress relieving process* 100 percent CNC machining with full statistical process control* Thick deck surface and 6-bolt cylinder head attachment (45 degree blocks) for improved sealing and reliability* Rough bore at 3.980 in. with various options that provide over-bore capacities up to 4.220 in.* Various options that provide deck height potentials of 8.900-9.560 in.* Tappet angles in both 59 degrees (stock) and 48 degrees (improved valvetrain geometry)* Thicker main webbing and pan rail for improved rigidity* Two and four-bolt mains in ductile iron, et, and aluminum options* Both 318/340 and 360 main journal sizes (minimize)