Twin Cam Big Bore Performance Kits

The Revolution Performance Bolt-On Big Bore Kit has proven itself time and time again on the dyno, but now it’s ready to prove itself to you! We’ve done the research for you, picked the proper components and packed on the savings in an all-inclusive kit ready for installation.

For maximum horsepower output, the Stage 3 kits are available in bigger cubic inch packages. These kits are custom tailored to your needs and budget. Call for details!

Go to our Facebook page to see the progress of our 114" build!

Available from
Drag Specialties


Twin Cam Bolt-On
Big Bore Kits
Twin Cam Bolt-On Big Bore Performance Kit photo

This kit includes the famous Revolution™ aerospace grade all aluminum cylinders with nickel-silicon-carbide electroplated bores. Also included are our new Revolution Performance pistons and high performance head gaskets. This is a true bolt-on kit and absolutely no machine work is required. Revolution™ cylinders are the only cylinders in the world that carry a lifetime warranty against warping and/or plating defects!

Choose either the 98 inch kit for your 99-06 or the 107 inch kit for your 07-up Twin Cam. Check out the Dyno Charts pages for some awesome examples of what your power return per dollar is with this extraordinary kit!

NEW 113 cid kit for 2012 SE 110 motors!

See our video on the installation of our kits.

Buy Online or Call today toll-free 1-866-892-2109!

Description Contents Styles Price (U.S.) Buy Online
99-Up Harley-Davidson Twin Cam models Bolt-On Big Bore kit, 98 cid, 3.938" x 4.00"
3.938" bore Revolution cylinders 10.5:1 forged pistons, pins, clips, rings head and base gaskets

Black/Blk Highlight 201-103W
Silver 201-101W
Black 201-107W

$999.95 Enter Store link
107 cid Bolt-On Big Bore Kit for 07 and later Harley-Davidson® Twin Cam models **No Case Boring**
3.938" bore Revolution cylinders 10.5:1 forged pistons, pins, clips, rings head and base gaskets
Black Highlight 201-119W
Black Highlight 201-119W45
Black 201-119ABW
Silver 201-120W
$999.95 Enter Store link
NEW! 113 cid Kits for 2012 SE 110 Motors
4.060” bore cylinders; 4.375 stroke; 10.5:1 domed pistons, pins, clips, rings head and base gaskets
Granite 201-177W
Black 201-176W
Blk Highlight 201-174W
Silver 201-175W
$1099.95 Enter Store link
Available from
Drag Specialties


Monster Big Bore Kits for Twin Cam

Twin Cam Monster Performance Kit photo
Monster Bore Kits for OEM and Aftermarket Twin Cam Cases!
All require case boring.

When you decide to pull the trigger on a big inch combination for your ’99-Up Twin Cam there are a couple of things to keep in mind. First is that you want it to be reliable and second is that you want it to be a BIG as it can be. Revolution Performance introduces our line of Twin Cam Monster Bore kits for ’99-Up Twin Cam 88 engines! These will also fit TC 96" engines—call us for exact fitment details!

Up to a full 4.250" bore in your OEM or aftermarket cases! The only way we can achieve this is through the use of our proprietary aerospace alloy one piece cylinders and in-house cylinder plating processes. Currently we offer the 99-Up TC 107" kit, the 114" kit for use with your stock crank assembly, the 124" upgrade kit for the 103 Screaming Eagle engines, and the massive 131" assembly for the customer with a BIG appetite for torque. All of these kits were real world beta tested for a full year to insure that we delivered the very best in quality and reliability to our customers. As with all other Revolution Cylinder kits these come complete with cylinders, our new Revolution Performance pistons, wrist pins, circlips and gaskets.

Buy Online or Call today toll-free 1-866-892-2109!

Description Contents Styles Price (U.S.) Buy Now
99-Up TC 107cid Big Bore Kit - 4.125"x4.00" 10.5:1CR
4.125" bore Revolution cylinders, 10.5:1 forged pistons, pins, clips, rings, head and base gaskets.
Black Highlight 201-131W
Black 201-133W
Silver 201-132W
$1099.95 Enter Store link
Big bore kit, 114cid (case boring required)
4.250 x 4.00
4.250" bore Revolution cylinders 10.5:1 forged pistons, pins, clips, rings head and base gaskets
Black Highlight 201-123W
Black 201-124W
Silver 201-122W
$1099.95 Enter Store link
07-Up TC 117cid Big Bore Kit - 4.125"x4.375" 10.5:1CR. This kit comes with -5cc dish piston
4.125" bore Revolution cylinders, 10.5:1 forged pistons, pins, clips, rings, head and base gaskets.
Black Highlight 201-171W
Granite 201-171WG
Silver 201-171S
$1099.95 Enter Store link
07-Up TC 117cid Big Bore Kit - 4.125"x4.375" 10.5:1CR. This kit comes with +1cc Dome
4.125" bore Revolution cylinders, 10.5:1 forged pistons using SE110 Heads, pins, clips, rings, and head and base gaskets.
Black Highlight 201-172WB
Granite 201-172WG
Silver 201-172WN
$1099.95 Enter Store link
124cid Monster Big Bore Kit-4.250 Bore x 4.375-**Big Bore Carb or T-Body a MUST**
When the time comes to step up to the next level this is your kit. Designed to work on top of your existing SE 103 flywheel assembly with case boring only! Complete with Revolution Cylinders, forged piston kit, and gasket kit.
Black Highlight 201-126W
Black 201-127W
Silver 201-125W
$1099.95 Enter Store link
131cid Monster Big Bore Kit-4.250 Bore x 4.625-**Big Bore Carb or T-Body a MUST**
4-5/8" S&S Crank Only!
This kit is for customers that require HUGE torque numbers! Customers have reported torque numbers exceeding 160 ftlbs on pump gas! Complete with Revolution Cylinders, forged piston kit, and gasket kit.
Black Highlight 201-129W
Silver 201-128W
$1099.95 Enter Store link
Big Bore Kits for the 110cid motors
110 cid Cylinders photo

We are excited to introduce these new cylinders specifically designed for the Screamin Eagle® 110 cid motors. They come in 117 cid and 124 cid sizes and are powder coated with the granite color to look like it came from the factory. The screaming will come from the bikes you leave behind!
All require case boring.

Call today toll-free 1-866-892-2109!

Description Contents Styles Price (U.S.) Buy Online
117 cid cylinder/piston kit for 110 cid Screamin Eagle motors
4.125" bore Revolution cylinders, 10.5:1 forged pistons, pins, clips, rings, head and base gaskets
Granite $1109.95
124 cid cylinder/piston kit for Screamin Eagle motors
4.25" bore Revolution cylinders, 10.5:1 forged pistons, pins, clips, rings, head and base gaskets
Granite $1109.95