Big Bore Kits

Forged pistons with rings, pins & clips. 11:1 compression ratio with stock heads. Highlighted fins. Bolt-on kit - No machining required. Includes gaskets. Made in the USA. Not legal for sale or use in California, or on any pollution controlled...

S&S® Black with highlighted fins 114c.i. Milwaukee-Eight® 114"-128" Big Bore Kit 4 & 1/2" Stroke 128" c.i.   Forged pistons with rings, pins & clips 11:1 compression ratio with stock heads Highlighted fins. Bolt-on kit - no...

Weight: 0.00 Forged pistons with rings, pins & clips. 11:1 compression ratio with stock heads. Highlighted fins. Bolt-on kit - no machining required. Includes gaskets. Made in the USA. Not legal for sale or use in California, or on any pollution...

Weight: 27.00 Go from 96" to 106" for 2007-2012 Big Twins or go from 88" to 97" for 1996-2006 Big Twins. Largest bore that we feel can safely be used in a cylinder with a stock spigot O.D.. Bolt-on 9 to 10 cubic inches - cylinders do not require...

Weight: 27.00 Go from 96" to 106" for 2007-2012 Big Twins or go from 88" to 97" for 1996-2006 Big Twins. Largest bore that we feel can safely be used in a cylinder with a stock spigot O.D.. Bolt-on 9 to 10 cubic inches - cylinders do not require...