When bigger isn’t big enough Revolution offers a Monster solution. Monster kits do require case boring, crankshaft services, and CNC porting for proper performance and reliability. Cam shaft recommendations are also available for your Monster build as well. We offer a host of other services and products to build the biggest American V-Twins available.
The cases must be bored wider to accept the new cylinders, as well as a crankshaft balance to even out the added weight that will be added to the bottom end. Of course, head flow services and larger camshafts are highly recommended to gain the absolute most out of these kits.
Select your year and model from the drop-down lists below. If your vehicle is not listed in our vehicle finder, please contact us at 1-888-779-6885 or info@millennium-tech.net and we will be happy to help find a solution.
114" KITS FOR 99-06 TWIN CAM
4.250" BORE CYLINDERS
10.5:1 FLAT-TOP PISTONS
If the Bolt-On Big Bore Kits are appealing, but just aren’t…
$1,125.95
114" KITS FOR 99-06 TWIN CAM
Black Highlight 4.250" BORE CYLINDERS
10.5:1 FLAT-TOP PISTONS
If the Bolt-On Big Bore Kits are appealing, but…
$1,125.95
114" KITS FOR 99-06 TWIN CAM
Black 4.250" BORE CYLINDERS
10.5:1 FLAT-TOP PISTONS
If the Bolt-On Big Bore Kits are appealing, but just…
$1,125.95
124" KITS FOR 07-up TWIN CAM AND 99-06 TWIN CAM WITH SCREAMIN' EAGLE STROKER CRANK
Silver 4.250” BORE CYLINDERS; 10.5:1 FLAT-TOP…
$1,125.95
124" KITS FOR 07-up TWIN CAM AND 99-06 TWIN CAM WITH SCREAMIN' EAGLE STROKER CRANK
Black Highlight 4.250" BORE CYLINDERS; 10.5:1…
$1,125.95
124" KITS FOR 07-up TWIN CAM AND 99-06 TWIN CAM WITH SCREAMIN' EAGLE STROKER CRANK
Black 4.250" BORE CYLINDERS; 10.5:1 FLAT-TOP…
$1,125.95
131" KITS FOR 07-up TWIN CAM AND 99-06 TWIN CAM WITH SCREAMIN' EAGLE STROKER CRANK
Silver 4.250" BORE CYLINDERS; 10.5:1 FLAT-TOP…
$1,125.95
131" KITS FOR 07-up TWIN CAM AND 99-06 TWIN CAM WITH SCREAMIN' EAGLE STROKER CRANK
Black Highlight 4.250" BORE CYLINDERS; 10.5:1…
$1,125.95
124" KITS FOR 07-up TWIN CAM AND 99-06 TWIN CAM WITH SCREAMIN' EAGLE STROKER CRANK
Granite 4.250" BORE CYLINDERS; 10.5:1 FLAT-TOP…
$1,125.95
107" KITS FOR 99-06 TWIN CAM
Black Highlight 4.125" BORE CYLINDERS
10.5:1 FLAT-TOP PISTONS
If the Bolt-On Big Bore Kits are appealing, but…
$1,125.95
107" KITS FOR 99-06 TWIN CAM
Silver 4.125" BORE CYLINDERS
10.5:1 FLAT-TOP PISTONS
If the Bolt-On Big Bore Kits are appealing, but just…
$1,125.95
107" KITS FOR 99-06 TWIN CAM
Black 4.125" BORE CYLINDERS
10.5:1 FLAT-TOP PISTONS
If the Bolt-On Big Bore Kits are appealing, but just…
$1,125.95
Revolution Performance 131" Big Bore Kit for Harley Davidson 120R engines. Kit comes with 4 1/4 bore, all black…
$1,125.95
117" KITS FOR 07 and Up 5cc dish
Silver 4.125" BORE CYLINDERS
4.375 STROKE; 10.5:1 FLATTOP PISTONS
If the Bolt-On Big Bore Kits…
$1,125.95
117" KITS FOR 07 and Up 5cc dish
Black Highlight 4.125" BORE CYLINDERS
4.375 STROKE; 10.5:1 DISH PISTONS
If the Bolt-On Big Bore…
$1,125.95
117" KITS FOR 07 and Up 5cc dish
Granite 4.125" BORE CYLINDERS
4.375 STROKE; 10.5:1 FLATTOP PISTONS
If the Bolt-On Big Bore Kits…
$1,125.95
117" Kits for 07 & Up, Black Highlight 4.125 Bore- 1cc Dome Piston If the Bolt-On Big Bore Kits are appealing,…
$1,125.95
117" Kits for 07 & Up, Granite 4.125 Bore- 1cc Dome Piston If the Bolt-On Big Bore Kits are appealing, but…
$1,125.95
117" Kits for 07 & Up, Silver 4.125 Bore- 1cc Dome Piston If the Bolt-On Big Bore Kits are appealing, but…
$1,125.95
127" Kits, Black 4.250 Bore x 4.5 Stroke If the Bolt-On Big Bore Kits are appealing, but just aren’t enough to…
$1,125.95
Please see technical info, charging instructions and installation instructions here.