X-Wedge engines have been supplied in three standard sizes:
X114: 4.125" bore, 4.250" stroke, 113.6CI (1.862cc)
X117: 4.125" bore, 4.375 stroke, 116.94CI (1.916cc)
X121: 4.250" bore, 4.250" stroke, 120.58CI (1.976cc)
Big Bore upgrades:
X117 to X132: 4.375" bore, 4.375" stroke, 131.54CI (2.156cc)
X121 to X128: 4.375" bore, 4.250" stroke, 127.78CI (2.094cc)
Crankcases and connecting rods are the same for all configurations and work with both the 4.250" and 4.375" stroke flywheels, as well as 4.125", 4.250" and 4.375" bore size cylinders.
