Iron Stable

Harley-Davidson CVO ROAD GLIDE Big Bore Kits

Genuine HD big bore kits and aftermarket alternatives that fit the CVO ROAD GLIDE — all years. Select your year for exact fitment and pricing.

Select your year for exact fitment & prices

202520242023202220212020201920182012

Genuine Harley-Davidson (10)

3-7/8" Standard Bore Piston Kit

Genuine Harley-Davidson

3-7/8" Standard Bore Piston Kit

22144-08B
Iron Pass £323.92£381.08View
Screamin' Eagle 4-Inch Big Bore Conversion Kit

Genuine Harley-Davidson

Screamin' Eagle 4-Inch Big Bore Conversion Kit

92500039
Iron Pass £1148.32£1350.96View
Big Bore Head Gasket Kit

Genuine Harley-Davidson

Big Bore Head Gasket Kit

16101-01
Iron Pass £48.25£56.76View
Screamin' Eagle 135CI Crate Engine, Touring

Genuine Harley-Davidson

Screamin' Eagle 135CI Crate Engine, Touring

16200978
Iron Pass £7155.29£8417.99View
Screamin' Eagle MVA CNC Ported Cylinder Heads

Genuine Harley-Davidson

Screamin' Eagle MVA CNC Ported Cylinder Heads

16925-11
Iron Pass £1422.25£1673.23View
Screamin' Eagle Stage III - 121ci to 125ci

Genuine Harley-Davidson

Screamin' Eagle Stage III - 121ci to 125ci

92500141
Iron Pass £1755.87£2065.73View
Screamin' Eagle 135ci Touring Crate Engine, Black

Genuine Harley-Davidson

Screamin' Eagle 135ci Touring Crate Engine, Black

16200980
Iron Pass £7155.29£8417.99View
Screamin' Eagle 135ci Stage IV Big Bore Kit

Genuine Harley-Davidson

Screamin' Eagle 135ci Stage IV Big Bore Kit

92500143
Iron Pass £4016.60£4725.41View
Screamin' Eagle 135ci Touring Crate Engine

Genuine Harley-Davidson

Screamin' Eagle 135ci Touring Crate Engine

16200979
Iron Pass £7155.29£8417.99View
Screamin' Eagle 135ci Touring Crate Engine, Black & Chrome

Genuine Harley-Davidson

Screamin' Eagle 135ci Touring Crate Engine, Black & Chrome

16200977
Iron Pass £7155.29£8417.99View

Aftermarket for your CVO ROAD GLIDE

Confirmed to fit your CVO ROAD GLIDE

Aftermarket big bore kits the supplier lists against the CVO ROAD GLIDE. Genuine Harley-Davidson is listed above, not here.

Piston Kit Big Bore 4.250" for M8 Models<br><ul><li>The Piston Kit Big Bore for M8 models is built for durability and consistent performance</li><li>These forged aluminum pistons are machined for precise tolerances, offering dependable compression and long service life</li><li>Designed with installability and reliability in mind, the kit supports routine maintenance and engine upgrades while helping maintain smooth operation under varied riding conditions</li></ul>

S&S

Piston Kit Big Bore 4.250" for M8 Models<br><ul><li>The Piston Kit Big Bore for M8 models is built for durability and consistent performance</li><li>These forged aluminum pistons are machined for precise tolerances, offering dependable compression and long service life</li><li>Designed with installability and reliability in mind, the kit supports routine maintenance and engine upgrades while helping maintain smooth operation under varied riding conditions</li></ul>

In stock
Iron Pass £499.14£587.22View
Wiseco, 4.25" big bore gasket kit

Wiseco

Wiseco, 4.25" big bore gasket kit

In stock
Iron Pass £75.95£89.35View
S&S, 107" to 124" big bore conversion cylinder & piston kit

S&S

S&S, 107" to 124" big bore conversion cylinder & piston kit

In stock
Iron Pass £1400.95£1648.18View
136" Big Bore Cylinder Kit<br><ul><li>Bolt on kit, the largest cylinder bore possible without requiring machining of crankcases</li><li>Includes MLS (multi-layered steel) head gaskets and cam cover badge</li><li>S&amp;S stroker 4.625" flywheel required and is sold separately</li><li>Takes 107"/114"/117" to 136" displacement</li><li>Original engine serial numbers are retained</li><li>Retains stock engine height</li><li>Made in the USA</li></ul>

S&S

136" Big Bore Cylinder Kit<br><ul><li>Bolt on kit, the largest cylinder bore possible without requiring machining of crankcases</li><li>Includes MLS (multi-layered steel) head gaskets and cam cover badge</li><li>S&amp;S stroker 4.625" flywheel required and is sold separately</li><li>Takes 107"/114"/117" to 136" displacement</li><li>Original engine serial numbers are retained</li><li>Retains stock engine height</li><li>Made in the USA</li></ul>

In stock
Iron Pass £990.01£1164.72View
BIG BORE KIT - M8 17-UP - 132/

S&S

BIG BORE KIT - M8 17-UP - 132/

In stock
Iron Pass £1571.89£1849.28View
BIG BORE KIT - M8 17-UP - 132/

S&S

BIG BORE KIT - M8 17-UP - 132/

In stock
Iron Pass £1560.97£1836.43View
BIG BORE KIT - M8 17-UP - 132/

S&S

BIG BORE KIT - M8 17-UP - 132/

In stock
Iron Pass £1560.97£1836.43View
BIG BORE KIT - M8 17-UP - 132/

S&S

BIG BORE KIT - M8 17-UP - 132/

In stock
Iron Pass £1550.25£1823.82View
BIG BORE KIT - M8 17-UP - 132/

S&S

BIG BORE KIT - M8 17-UP - 132/

In stock
Iron Pass £1543.12£1815.44View
BIG BORE KIT - M8 17-UP - 132/

S&S

BIG BORE KIT - M8 17-UP - 132/

In stock
Iron Pass £1542.95£1815.24View
128" Power Package for 114"/117" Oil Cooled M8<br><ul><li>Made in the USA</li><li>Big Bore Kit</li><li>Big-bore bolt-on kit increases 114"/117" with 4-1/2" stroke M-Eight to 128" with no case machining required</li><li>4-1/4" bore cylinders with 11:1 forged pistons</li><li>Oil Pump/Cam Plate</li><li>S&amp;S oil pump/cam plate with blue anodized finish</li><li>Passage plugs are removable for servicing</li><li>Independent scavenge sections for flywheel cavity and camchest</li><li>Debris screen in both scavenge pickups</li><li>Magnet in camchest to help prevent debris from entering the oil pump</li><li>Increased oil flow capacity on both the oil feed and scavenge side</li><li>Adjustable pressure relief valve can be adjusted with the unit installed in the engine</li><li>Pushrods</li><li>Quikee pushrods with chrome pushrod tubes</li><li>Tappets</li><li>S&amp;S premium tappets</li><li>Tappet Cuffs</li><li>S&amp;S hard-anodized, black coated tappet cuffs are billet aluminum construction</li><li>Improve tappet stability in high-lift, high-rpm situations</li><li>Cam</li><li>S&amp;S 550 cams designed for big bore applications</li><li>Valve Springs</li><li>S&amp;S valve springs work with cams up to .605" lift</li><li>High-performance conical single-wire spring design</li><li>All necessary gaskets, bearings and hardware for bolt-on installation is included</li></ul><br>Not recommended for Tri-Glide or other three wheel models including conversion due to lugging nature of these bikes.

S&S

128" Power Package for 114"/117" Oil Cooled M8<br><ul><li>Made in the USA</li><li>Big Bore Kit</li><li>Big-bore bolt-on kit increases 114"/117" with 4-1/2" stroke M-Eight to 128" with no case machining required</li><li>4-1/4" bore cylinders with 11:1 forged pistons</li><li>Oil Pump/Cam Plate</li><li>S&amp;S oil pump/cam plate with blue anodized finish</li><li>Passage plugs are removable for servicing</li><li>Independent scavenge sections for flywheel cavity and camchest</li><li>Debris screen in both scavenge pickups</li><li>Magnet in camchest to help prevent debris from entering the oil pump</li><li>Increased oil flow capacity on both the oil feed and scavenge side</li><li>Adjustable pressure relief valve can be adjusted with the unit installed in the engine</li><li>Pushrods</li><li>Quikee pushrods with chrome pushrod tubes</li><li>Tappets</li><li>S&amp;S premium tappets</li><li>Tappet Cuffs</li><li>S&amp;S hard-anodized, black coated tappet cuffs are billet aluminum construction</li><li>Improve tappet stability in high-lift, high-rpm situations</li><li>Cam</li><li>S&amp;S 550 cams designed for big bore applications</li><li>Valve Springs</li><li>S&amp;S valve springs work with cams up to .605" lift</li><li>High-performance conical single-wire spring design</li><li>All necessary gaskets, bearings and hardware for bolt-on installation is included</li></ul><br>Not recommended for Tri-Glide or other three wheel models including conversion due to lugging nature of these bikes.

In stock
Iron Pass £2158.13£2538.98View