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 alternatives

Aftermarket big bore kits that fit 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 £1489.03£1751.80View
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 £1489.03£1751.80View
Big Bore Cylinder Kit<br><ul><li>Bolt-on without requiring machining of the crankcase</li><li>Original engine serial numbers are retained</li><li>MLS (multi-layered steel) head gaskets</li><li>Retains stock engine height</li><li>Includes cam cover badge</li><li>All necessary gaskets and hardware required for installation is included</li><li>Made in the USA</li></ul>

S&S

Big Bore Cylinder Kit<br><ul><li>Bolt-on without requiring machining of the crankcase</li><li>Original engine serial numbers are retained</li><li>MLS (multi-layered steel) head gaskets</li><li>Retains stock engine height</li><li>Includes cam cover badge</li><li>All necessary gaskets and hardware required for installation is included</li><li>Made in the USA</li></ul>

In stock
Iron Pass £1455.01£1711.78View