129CI Big Bore kit 4.375" str all black

These 4.32" (109.73mm) bore kits are easy to install as no machining of the crankcase is required. Kits include forged pistons, piston rings, wrist pins, clips, cylinders, head and base gaskets and a cam cover badge. 129CI (2,113cc) kits are for use in 107CI Milwaukee Eight engines with stock 4.375" stroke. The 132CI (2,147cc) kits are for use in 114CI and 117CI Milwaukee Eight engines with stock 4.500" stroke.

Note: OEM head bolts are a stretch-to-torque design and can only be used once. Consequently, installation requires the use of 8 new head bolts or a super strong and re-useable S&S or Feuling/ARP head bolt kit.