Big Bore Kits
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S&S Cycle - 128" Power Packages fits '17-'21 M8 Oil-Cooled Engines
S&S Cycle
$3,460.95S&S Cycle - 128" Power Packages fits '17-'20 M8 Oil-Cooled Engines This Power Package increases your 114"/117" with a 4-1/2" stroke M8 to 128". It is available in a wrinkle black or black granite finish and your choice of cylinders with or without...$3,460.95 -
S&S Cycle - 124" Power Packages fits '17-'21 M8 Oil-Cooled Engines
S&S Cycle
$2,699.95 - $3,695.95S&S Cycle - 124" Power Packages fits '17-'20 M8 Oil-Cooled Engines This bolt-on Power Package increases your 107" M8 Engine to 124". It comes in a wrinkle black finish and is available with or without fin highlighting. You can also choose between a...$2,699.95 - $3,695.95 -
S&S Cycle - 96" Big Bore Kit fits '84-'00 Evolution Big Twin Engines (3⅝" Bore, 4⅝" Stroke, 9.75:1 Compression Ratio W/ Stock Heads)
S&S Cycle
$1,489.95S&S Cycle - 96" Big Bore Kit fits '84-'00 Evolution Big Twin Engines (3⅝" Bore, 4⅝" Stroke, 9.75:1 Compression Ratio W/ Stock Heads) The cylinders featured in this kit are built with premium aluminum castings with cast-in iron liners. This kit also...$1,489.95 -
S&S Cycle - Hooligan Kits fits '00-'20 XL Models
S&S Cycle
MSRP: $1,999.95$1,822.95S&S Cycle - Hooligan Kits fits '00-'20 XL Models S&S Cycle's Hooligan Kits are bolt on big-bore kits that provide easy installation without any machining or rebalancing. The cams are .482" lift and 240° duration intake and 234° degree...MSRP: $1,999.95$1,822.95 -
Out of stock
S&S Big Bore Kit for M8 Harley Softail & Touring '17-Up
S&S Cycle
$929.95S&S Big Bore Kit for M8 Harley Softail & Touring '17-Up This S&S Big Bore Kit is for Milwaukee-Eight Harley Softail and Touring models 2017 and up, including Softail Heritage Classic and Breakout. Available as a whole kit or as a cylinder...$929.95 -
S&S Cycle - Black Powdercoat 95" Big Bore Kit fits '99-'06 Twin Cam Engines (3.875" Bore, 4" Stroke, 9.7:1 Comp. W/ Stock Heads)
S&S Cycle
$1,287.95S&S Cycle - Black Powdercoat 95" Big Bore Kit fits '99-'06 Twin Cam Engines (3.875" Bore, 4" Stroke, 9.7:1 Comp. W/ Stock Heads) This Big Bore Kit produces outstanding outcomes with stock cylinder heads. It comes complete with cylinders, pistons,...$1,287.95 -
S&S Cycle - Wrinkle Black 110" Bolt-In Sidewinder® 4" Big Bore Kit fits '07-'17 Twin Cam Engines
S&S Cycle
MSRP: $1,549.95$1,540.95S&S Cycle - Wrinkle Black 110" Bolt-In Sidewinder® 4" Big Bore Kit fits '07-'17 Twin Cam Engines This Big Bore Kit has a 10.5:1 compression ratio (W/ stock 85cc heads) that will transform your engine into a street-ready and reliable machine...MSRP: $1,549.95$1,540.95 -
S&S Cycle - 110" Power Package fits '07-'17 Twin Cam Engines
S&S Cycle
$3,396.95S&S Cycle - 110" Power Package fits '07-'17 Twin Cam Engines S&S Cycle has created the largest big-bore kits available today, without doing crankcase mods! This kit increases displacement to 110" ('07-'17) and the cylinders fit to the pistons...$3,396.95 -
Cometic - C10217 - Top End Kit M8 3.937" 107Cu .040"H/G Oe#25700729
Cometic
$238.10Cometic - C10217 - Top End Kit M8 3.937" 107Cu .040"H/G Oe#25700729FeaturesAt Cometic Gasket, our goal is to offer the latest in gasket technologyMaterials, manufacturing processes and gasket designs are constantly improving to match the higher level of...$238.10 -
Cometic - C10218-030 - Top End Kit M8 4.00" 114Cu Cvo .030"H/G
Cometic
$238.10Cometic - C10218-030 - Top End Kit M8 4.00" 114Cu Cvo .030"H/GFeaturesAt Cometic Gasket, our goal is to offer the latest in gasket technologyMaterials, manufacturing processes and gasket designs are constantly improving to match the higher level of...$238.10 -
Cometic - C10220-030 - Top End Kit M8 4.125" 117Cu .030"H/G
Cometic
$238.10Cometic - C10220-030 - Top End Kit M8 4.125" 117Cu .030"H/GFeaturesAt Cometic Gasket, our goal is to offer the latest in gasket technologyMaterials, manufacturing processes and gasket designs are constantly improving to match the higher level of...$238.10 -
Cometic - C10221 - Top End Kit M8 4.185" 120Cu .040"H/G
Cometic
$238.10Cometic - C10221 - Top End Kit M8 4.185" 120Cu .040"H/GFeaturesAt Cometic Gasket, our goal is to offer the latest in gasket technologyMaterials, manufacturing processes and gasket designs are constantly improving to match the higher level of performance...$238.10 -
Wiseco - K2787 - M8 Big Bore Pistons 124" 11:1 Comp
Wiseco
$524.95Wiseco - K2787 - M8 Big Bore Pistons 124" 11:1 CompFeaturesPremium compression ring for ultimate ring sealNapier second ring, taper face with underhook improves oil control3mm Oil ring design for higher tension and enhanced oil controlArmor X piston...$524.95 -
Rocket Performance Garage Llc - 8-8102 - Big Bore Cylinder Kit 128" M8 17-24 (Exc.Vvt)
ROCKET PERFORMANCE GARAGE LLC
$1,599.99Rocket Performance Garage Llc - 8-8102 - Big Bore Cylinder Kit 128" M8 17-24 (Exc.Vvt)FeaturesThere is no replacement for displacement' is the mindset we have lived by for over 25 years in the V-Twin industry. Rocket Cams is proud to introduce their high...$1,599.99 -
Rocket Performance Garage Llc - 8-8101 - Big Bore Cylinder Kit 124" M8 17-24 (Exc.Vvt)
ROCKET PERFORMANCE GARAGE LLC
$1,599.99Rocket Performance Garage Llc - 8-8101 - Big Bore Cylinder Kit 124" M8 17-24 (Exc.Vvt)FeaturesThere is no replacement for displacement' is the mindset we have lived by for over 25 years in the V-Twin industry. Rocket Cams is proud to introduce their high...$1,599.99 -
Rocket Performance Garage Llc - 8-8002 - Big Bore Cylinder Kit 110" Twin Cam `07-17
ROCKET PERFORMANCE GARAGE LLC
$1,428.99Rocket Performance Garage Llc - 8-8002 - Big Bore Cylinder Kit 110" Twin Cam `07-17FeaturesThere is no replacement for displacement' is the mindset we have lived by for over 25 years in the V-Twin industry. Rocket Cams is proud to introduce their high...$1,428.99 -
S&S Cycle - 09040169 - 132" Power Pack - 550 Chain Drive - Water Cooled - Wrinkle Black w/Highlight Fins - M8
S&S Cycle
MSRP: $3,359.95$3,294.95S&S CYCLE - 09040169 - 132" Power Pack - 550 Chain Drive - Water Cooled - Wrinkle Black w/Highlight Fins - M8Features550 lift for the ideal combination of horse power and torquePowder coat finish matched to factoryMLS (Multi-Layered Steel) head...MSRP: $3,359.95$3,294.95 -
S&S Cycle - 09040168 - 132" Power Pack - 550 Chain Drive - Water Cooled - Black Granite w/Highlight Fins - M8
S&S Cycle
MSRP: $3,359.95$3,294.95S&S CYCLE - 09040168 - 132" Power Pack - 550 Chain Drive - Water Cooled - Black Granite w/Highlight Fins - M8Features550 lift for the ideal combination of horse power and torquePowder coat finish matched to factoryMLS (Multi-Layered Steel) head...MSRP: $3,359.95$3,294.95 -
S&S Cycle - 09040167 - 129" Power Pack - 550 Chain Drive - Oil Cooled - Wrinkle Black w/Highlight Fins - M8
S&S Cycle
MSRP: $3,359.95$3,294.95S&S CYCLE - 09040167 - 129" Power Pack - 550 Chain Drive - Oil Cooled - Wrinkle Black w/Highlight Fins - M8Features550 lift for the ideal combination of horse power and torquePowder coat finish matched to factoryMLS (Multi-Layered Steel) head...MSRP: $3,359.95$3,294.95 -
S&S Cycle - 09040166 - 129" Power Pack - 550 Chain Drive - Oil Cooled - Wrinkle Black w/Highlight Fins - M8
S&S Cycle
MSRP: $3,359.95$3,294.95S&S CYCLE - 09040166 - 129" Power Pack - 550 Chain Drive - Oil Cooled - Wrinkle Black w/Highlight Fins - M8Features550 lift for the ideal combination of horse power and torquePowder coat finish matched to factoryMLS (Multi-Layered Steel) head...MSRP: $3,359.95$3,294.95 -
S&S Cycle - 09040164 - 132" Power Pack - 550 Chain Drive - Oil Cooled - Wrinkle Black w/Highlight Fins - M8
S&S Cycle
MSRP: $3,359.95$3,294.95S&S CYCLE - 09040164 - 132" Power Pack - 550 Chain Drive - Oil Cooled - Wrinkle Black w/Highlight Fins - M8Features550 lift for the ideal combination of horse power and torquePowder coat finish matched to factoryMLS (Multi-Layered Steel) head...MSRP: $3,359.95$3,294.95 -
S&S Cycle - 09040163 - 132" Power Pack - 550 Chain Drive - Oil Cooled - Black w/o Highlight Fins - M8
S&S Cycle
MSRP: $3,359.95$3,294.95S&S CYCLE - 09040163 - 132" Power Pack - 550 Chain Drive - Oil Cooled - Black w/o Highlight Fins - M8Features550 lift for the ideal combination of horse power and torquePowder coat finish matched to factoryMLS (Multi-Layered Steel) head gasketsIncludes...MSRP: $3,359.95$3,294.95 -
S&S Cycle - 09040162 - 132" Power Pack - 550 Chain Drive - Oil Cooled - Black Granite w/Highlight Fins - M8
S&S Cycle
MSRP: $3,359.95$3,294.95S&S CYCLE - 09040162 - 132" Power Pack - 550 Chain Drive - Oil Cooled - Black Granite w/Highlight Fins - M8Features550 lift for the ideal combination of horse power and torquePowder coat finish matched to factoryMLS (Multi-Layered Steel) head...MSRP: $3,359.95$3,294.95 -
S&S Cycle - 09040160 - 132" Power Pack - 550 Gear Drive - Water Cooled - Black Granite w/Highlight Fins - M8
S&S Cycle
MSRP: $3,559.95$3,497.95S&S CYCLE - 09040160 - 132" Power Pack - 550 Gear Drive - Water Cooled - Black Granite w/Highlight Fins - M8Features550 lift for the ideal combination of horse power and torquePowder coat finish matched to factoryMLS (Multi-Layered Steel) head...MSRP: $3,559.95$3,497.95 -
S&S Cycle - 09040161 - 132" Power Pack - 550 Gear Drive - Water Cooled - Wrinkle Black w/Highlight Fins - M8
S&S Cycle
MSRP: $3,559.95$3,497.95S&S CYCLE - 09040161 - 132" Power Pack - 550 Gear Drive - Water Cooled - Wrinkle Black w/Highlight Fins - M8Features550 lift for the ideal combination of horse power and torquePowder coat finish matched to factoryMLS (Multi-Layered Steel) head...MSRP: $3,559.95$3,497.95 -
S&S Cycle - 09040158 - 129" Power Pack - 550 Gear Drive - Oil Cooled - Wrinkle Black w/Highlight Fins - M8
S&S Cycle
MSRP: $3,559.95$3,497.95S&S CYCLE - 09040158 - 129" Power Pack - 550 Gear Drive - Oil Cooled - Wrinkle Black w/Highlight Fins - M8Features550 lift for the ideal combination of horse power and torquePowder coat finish matched to factoryMLS (Multi-Layered Steel) head...MSRP: $3,559.95$3,497.95 -
S&S Cycle - 09040157 - 129" Power Pack - 550 Gear Drive - Oil Cooled - Wrinkle Black w/o Highlight Fins - M8
S&S Cycle
MSRP: $3,559.95$3,497.95S&S CYCLE - 09040157 - 129" Power Pack - 550 Gear Drive - Oil Cooled - Wrinkle Black w/o Highlight Fins - M8Features550 lift for the ideal combination of horse power and torquePowder coat finish matched to factoryMLS (Multi-Layered Steel) head...MSRP: $3,559.95$3,497.95 -
S&S Cycle - 09040156 - 132" Power Pack - 550 Gear Drive - Oil Cooled - Wrinkle Black w/Highlight Fins - M8
S&S Cycle
MSRP: $3,559.95$3,497.95S&S CYCLE - 09040156 - 132" Power Pack - 550 Gear Drive - Oil Cooled - Wrinkle Black w/Highlight Fins - M8Features550 lift for the ideal combination of horse power and torquePowder coat finish matched to factoryMLS (Multi-Layered Steel) head...MSRP: $3,559.95$3,497.95 -
S&S Cycle - 09040154 - 132" Power Pack - 550 Gear Drive - Oil Cooled - Black Granite w/Highlight Fins - M8
S&S Cycle
MSRP: $3,559.95$3,497.95S&S CYCLE - 09040154 - 132" Power Pack - 550 Gear Drive - Oil Cooled - Black Granite w/Highlight Fins - M8Features550 lift for the ideal combination of horse power and torquePowder coat finish matched to factoryMLS (Multi-Layered Steel) head...MSRP: $3,559.95$3,497.95 -
S&S Cycle - 09040155 - 132" Power Pack - 550 Gear Drive - Oil Cooled - Black w/o Highlight Fins - M8
S&S Cycle
MSRP: $3,559.95$3,497.95S&S CYCLE - 09040155 - 132" Power Pack - 550 Gear Drive - Oil Cooled - Black w/o Highlight Fins - M8Features550 lift for the ideal combination of horse power and torquePowder coat finish matched to factoryMLS (Multi-Layered Steel) head gasketsIncludes...MSRP: $3,559.95$3,497.95 -
S&S Cycle - 09040153 - 132" High Compression | 136" Big Bore Kit - 4.320" Bore - Black Granite w/Highlighted Fins - M8
S&S Cycle
$1,849.95S&S CYCLE - 09040153 - 132" High Compression | 136" Big Bore Kit - 4.320" Bore - Black Granite w/Highlighted Fins - M8Features132" high compression kit will work on 114"/117" motors with 4-1/2" stroke flywheels onlyTo achieve 136" big bore, S&S flywheel...$1,849.95 -
S&S Cycle - 09040149 - 132" High Compression | 136" Big Bore Kit - 4.320" Bore - Black w/o Highlighted Fins - M8
S&S Cycle
$1,695.95S&S CYCLE - 09040149 - 132" High Compression | 136" Big Bore Kit - 4.320" Bore - Black w/o Highlighted Fins - M8Features132" high compression kit will work on 114"/117" motors with 4-1/2" stroke flywheels onlyTo achieve 136" big bore, S&S flywheel with...$1,695.95 -
S&S Cycle - 09040152 - 132" High Compression | 136" Big Bore Kit - 4.320" Bore - Black w/o Highlighted Fins - M8
S&S Cycle
$1,849.95S&S CYCLE - 09040152 - 132" High Compression | 136" Big Bore Kit - 4.320" Bore - Black w/o Highlighted Fins - M8Features132" high compression kit will work on 114"/117" motors with 4-1/2" stroke flywheels onlyTo achieve 136" big bore, S&S flywheel with...$1,849.95 -
S&S Cycle - 09040151 - 132" High Compression | 136" Big Bore Kit - 4.320" Bore - Black w/Highlighted Fins - M8
S&S Cycle
$1,849.95S&S CYCLE - 09040151 - 132" High Compression | 136" Big Bore Kit - 4.320" Bore - Black w/Highlighted Fins - M8Features132" high compression kit will work on 114"/117" motors with 4-1/2" stroke flywheels onlyTo achieve 136" big bore, S&S flywheel with...$1,849.95 -
S&S Cycle - 09040150 - 132" High Compression | 136" Big Bore Kit - 4.320" Bore - Black Granite w/Highlighted Fins - M8
S&S Cycle
$1,849.95S&S CYCLE - 09040150 - 132" High Compression | 136" Big Bore Kit - 4.320" Bore - Black Granite w/Highlighted Fins - M8Features132" high compression kit will work on 114"/117" motors with 4-1/2" stroke flywheels onlyTo achieve 136" big bore, S&S flywheel...$1,849.95 -
S&S Cycle - 09040148 - 132" High Compression | 136" Big Bore Kit - 4.320" Bore - Black w/Highlighted Fins - M8
S&S Cycle
$1,849.95S&S CYCLE - 09040148 - 132" High Compression | 136" Big Bore Kit - 4.320" Bore - Black w/Highlighted Fins - M8Features132" high compression kit will work on 114"/117" motors with 4-1/2" stroke flywheels onlyTo achieve 136" big bore, S&S flywheel with...$1,849.95 -
S&S Cycle - 09040147 - Power Pack - 4.375" Stroke - Water Cooled - Black w/Highlights - M8
S&S Cycle
$3,497.95S&S CYCLE - 09040147 - Power Pack - 4.375" Stroke - Water Cooled - Black w/Highlights - M8FeaturesBolt-on kitWith updated finsNo case machining requiredForged pistonsMade in the USAIncludes oil pump/cam plate, pushrods, tappets, tappet cuffs, 550...$3,497.95 -
S&S Cycle - 09040146 - Power Pack - 4.375" Stroke - Water Cooled - Black w/Highlights - M8
S&S Cycle
$3,294.95S&S CYCLE - 09040146 - Power Pack - 4.375" Stroke - Water Cooled - Black w/Highlights - M8FeaturesBolt-on kitWith updated finsNo case machining requiredForged pistonsMade in the USAIncludes oil pump/cam plate, pushrods, tappets, tappet cuffs, 550...$3,294.95 -
S&S Cycle - 09040145 - Power Pack - 4.375" Stroke - Water Cooled - Black w/Highlights - M8
S&S Cycle
$3,294.95S&S CYCLE - 09040145 - Power Pack - 4.375" Stroke - Water Cooled - Black w/Highlights - M8FeaturesBolt-on kitWith updated finsNo case machining requiredForged pistonsMade in the USAIncludes oil pump/cam plate, pushrods, tappets, tappet cuffs, 550...$3,294.95 -
S&S Cycle - 09040140 - Power Pack - 4.375" Stroke - Oil Cooled - Black w/o Highlights - M8
S&S Cycle
$3,497.95S&S CYCLE - 09040140 - Power Pack - 4.375" Stroke - Oil Cooled - Black w/o Highlights - M8FeaturesBolt-on kitWith updated finsNo case machining requiredForged pistonsMade in the USAIncludes oil pump/cam plate, pushrods, tappets, tappet cuffs, 550...$3,497.95
Harley Big Bore Kits
Deadbeat Customs knows Big Bore Kits are the key to increasing displacement on your Harley. Big Bore Kits replace your stock pistons and cylinders with larger ones, leading to greater displacement. When it comes to performance there’s no replacement for displacement! We have an excellent selection of kits manufactured by S&S Cycle, which come complete with all instructions to ease the installation process. The Big Bore Kits come complete with all necessary hardware. The only decisions you’ll need to make will be choosing the right fitment and finish.