CRANK IS THE SAME AS THE REG 3.5 AND SO A RE THE RODS BUT THE PISTONS HAVE A DIFFERENT SHAPED TOP IN THE COMBUSTION CHAMBER AREA AND THE RINGS ARE DIFF, FROM WHAT I CAN TELL THE OIL CONTROL RINGS ARE A DIFF DESIGN BUT THE UPPER 2 RINGS LOOK TO BE THE SAME DESIGN , AND OF COURSE THE HEADS ARE COMPLETELY DIFF AS THIS DI ENG ALSO HAS VARIABLE VLV TIMING (ACTUALLY VARIABLE CAM TIMING ON THIS ONE )JERRY