Big Bore Kits
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Out of stock
S&S Cycle - 310-1237 - 132" Power Package Engine Performance Kit - Chain Drive - Oil Cooled - Highlighted Fins - M8
S&S Cycle
$3,359.95S&S Cycle - 310-1237 - 132" Power Package Engine Performance Kit - Chain Drive - Oil Cooled - Highlighted Fins - M8FeaturesTransform the 114" or the 117" oil-cooled M8 into 132"Adjustable pressure relief valve can be adjusted with unit installed in the...$3,359.95 -
Out of stock
S&S Cycle - 310-1231 - 132" Power Package Engine Performance Kit - Chain Drive - Oil Cooled - Highlighted Fins - M8
S&S Cycle
$3,359.95S&S Cycle - 310-1231 - 132" Power Package Engine Performance Kit - Chain Drive - Oil Cooled - Highlighted Fins - M8FeaturesTransform the 114" or the 117" oil-cooled M8 into 132"Adjustable pressure relief valve can be adjusted with unit installed in the...$3,359.95 -
Out of stock
S&S Cycle - 310-1235 - 132" Power Package Engine Performance Kit - Chain Drive - Water Cooled - Highlighted Fins - M8
S&S Cycle
$3,359.95S&S Cycle - 310-1235 - 132" Power Package Engine Performance Kit - Chain Drive - Water Cooled - Highlighted Fins - M8FeaturesTransform the 114" or the 117" water-cooled M8 into 132"Adjustable pressure relief valve can be adjusted with unit installed in...$3,359.95 -
Out of stock
S&S Cycle - 310-1225 - 129" Power Package Engine Performance Kit - Chain Drive - Oil Cooled - Highlighted Fins - M8
S&S Cycle
$3,359.95S&S Cycle - 310-1225 - 129" Power Package Engine Performance Kit - Chain Drive - Oil Cooled - Highlighted Fins - M8FeaturesTransform 107" oil-cooled M8 into 129" with no case machining requiredBig bore cylinders come with matching cam, cam plate and oil...$3,359.95 -
Out of stock
S&S Cycle - 310-1233 - 132" Power Package Engine Performance Kit - Chain Drive - Oil Cooled - Non-Highlighted Fins - M8
S&S Cycle
$3,359.95S&S Cycle - 310-1233 - 132" Power Package Engine Performance Kit - Chain Drive - Oil Cooled - Non-Highlighted Fins - M8FeaturesTransform the 114" or the 117" oil-cooled M8 into 132"Adjustable pressure relief valve can be adjusted with unit installed in...$3,359.95 -
Out of stock
S&S Cycle - 310-1223 - 129" Power Package Engine Performance Kit - Chain Drive - Oil Cooled - Highlighted Fins - M8
S&S Cycle
$3,359.95S&S Cycle - 310-1223 - 129" Power Package Engine Performance Kit - Chain Drive - Oil Cooled - Highlighted Fins - M8FeaturesTransform 107" oil-cooled M8 into 129" with no case machining requiredBig bore cylinders come with matching cam, cam plate and oil...$3,359.95 -
Out of stock
S&S Cycle - 310-1229 - 132" Power Package Engine Performance Kit - Chain Drive - Water Cooled - Highlighted Fins - M8
S&S Cycle
$3,359.95S&S Cycle - 310-1229 - 132" Power Package Engine Performance Kit - Chain Drive - Water Cooled - Highlighted Fins - M8FeaturesTransform the 114" or the 117" water-cooled M8 into 132"Adjustable pressure relief valve can be adjusted with unit installed in...$3,359.95 -
Out of stock
S&S Cycle - 310-1107B - 128" Power Package Engine Performance Kit - Chain Drive
S&S Cycle
MSRP: $3,265.95$3,109.95S&S Cycle - 310-1107B - 128" Power Package Engine Performance Kit - Chain DriveFeaturesBig-bore bolt-on kit increases 114"/117" with 4-1/2" stroke M-Eight with no case machining required4-1/4" bore cylinders with 11:1 forged pistonsS&S oil pump/cam plate...MSRP: $3,265.95$3,109.95 -
Out of stock
S&S Cycle - 310-1108A - 128" Power Package Engine Performance Kit - Gear Drive
S&S Cycle
MSRP: $3,427.95$3,359.95S&S Cycle - 310-1108A - 128" Power Package Engine Performance Kit - Gear DriveFeaturesBig-bore bolt-on kit increases 114"/117" with 4-1/2" stroke M-Eight with no case machining required4-1/4" bore cylinders with 11:1 forged pistonsS&S oil pump/cam plate...MSRP: $3,427.95$3,359.95 -
Out of stock
S&S Cycle - 310-1101B - 128" Power Package Engine Performance Kit - Chain Drive
S&S Cycle
$3,265.95S&S Cycle - 310-1101B - 128" Power Package Engine Performance Kit - Chain DriveFeaturesBig-bore bolt-on kit increases 114"/117" with 4-1/2" stroke M-Eight with no case machining required4-1/4" bore cylinders with 11:1 forged pistonsS&S oil pump/cam plate...$3,265.95 -
Out of stock
S&S Cycle - 310-1102A - 128" Power Package Engine Performance Kit - Gear Drive
S&S Cycle
MSRP: $3,460.95$3,289.95S&S Cycle - 310-1102A - 128" Power Package Engine Performance Kit - Gear Drive Features Big-bore bolt-on kit increases 114"/117" with 4-1/2" stroke M-Eight with no case machining required 4-1/4" bore cylinders with 11:1 forged pistons S&S...MSRP: $3,460.95$3,289.95 -
Out of stock
S&S Cycle - 900-0354 - 106" Hot Set Up® Kit - 3.967" Bore - Wrinkle Black - Twin Cam
S&S Cycle
$2,143.95S&S Cycle - 900-0354 - 106" Hot Set Up® Kit - 3.967" Bore - Wrinkle Black - Twin CamFeaturesIncreased fin area for better heat dissipationIncrease bore size from 3.750" to 3.927"4.375" stroke, 10.0:1 compression with stock headsEasy installation; no...$2,143.95 -
Out of stock
S&S Cycle - 91-7661 - 96" Sidewinder® - 3.625" Big Bore - Stroker Kit - Wrinkle Black - Evolution Big Twin
S&S Cycle
$2,879.95S&S Cycle - 91-7661 - 96" Sidewinder® - 3.625" Big Bore - Stroker Kit - Wrinkle Black - Evolution Big TwinFeaturesKit includes standard flywheel assembly, 3.625" Sidewinder® stroker big bore cylinder, 9.75:1 compression ratio pistons, rings and...$2,879.95 -
Out of stock
S&S Cycle - 91-7660 - 96" Sidewinder® - 3.625" Big Bore - Stroker Kit - Natural - Evolution Big Twin
S&S Cycle
$2,879.95S&S Cycle - 91-7660 - 96" Sidewinder® - 3.625" Big Bore - Stroker Kit - Natural - Evolution Big TwinFeaturesKit includes standard flywheel assembly, 3.625" Sidewinder® stroker big bore cylinder, 9.75:1 compression ratio pistons, rings and gasketsFlywheel...$2,879.95 -
Out of stock
S&S Cycle - 136" Big Bore Cylinder Kit fits '17 & Up M8 Engines
S&S Cycle
$1,599.95 - $1,643.95S&S Cycle - 136" Big Bore Cylinder Kit fits '17 & Up M8 Engines S&S Cycle's Big Bore Cylinder & Piston Kit delivers a mighty bore increase (4.320") that, in turn, delivers a huge power increase! It is compatible with stock crankcases,...$1,599.95 - $1,643.95 -
Out of stock
S&S Cycle - Black Powdercoat 117" Big Bore Kit fits '07-'17 Twin Cam Engines (4.125" Bore, 4⅜" Stroke, 10.5:1 Comp. W/ Stock Heads)
S&S Cycle
$1,643.95S&S Cycle - Black Powdercoat 117" Big Bore Kit fits '07-'17 Twin Cam Engines (4.125" Bore, 4⅜" Stroke, 10.5:1 Comp. W/ Stock Heads) This Big Bore Kit produces outstanding outcomes with stock cylinder heads. It comes complete with cylinders, pistons,...$1,643.95 -
Out of stock
S&S Cycle - Stone Gray Powdercoat 124" Big Bore Kit fits '07-'17 Twin Cam Engines (4.125" Bore, 4⅝" Stroke, 11.4:1 Comp. W/ Stock Heads)
S&S Cycle
MSRP: $1,679.95$1,643.95S&S Cycle - Stone Gray Powdercoat 124" Big Bore Kit fits '07-'17 Twin Cam Engines (4.125" Bore, 4⅝" Stroke, 11.4:1 Comp. W/ Stock Heads) This Big Bore Kit comes complete with cylinders, pistons, rings and gaskets (head, base and exhaust)...MSRP: $1,679.95$1,643.95 -
Out of stock
S&S Cycle - Wrinkle Black 124" Big Bore Kit W/ Highlighted Cylinder Fins fits '17-'21 107" M8 Engines
S&S Cycle
$1,632.95S&S Cycle - Wrinkle Black 124" Big Bore Kit W/ Highlighted Cylinder Fins fits '17-'21 107" M8 Engines This is a bolt-on kit that features the biggest bore possible with no machining of the crankcases necessary! It includes all of the required...$1,632.95 -
Out of stock
S&S Cycle - Wrinke Black 128" Big Bore Kit W/O Highlighted Cylinder Fins fits '17-'20 114" 117" M8 Engines
S&S Cycle
$1,561.95S&S Cycle - Wrinke Black 128" Big Bore Kit W/O Highlighted Cylinder Fins fits '17-'20 114" 117" M8 Engines This is a bolt-on kit that features the biggest cylinder bore possible with no machining of the crankcases necessary! It includes all of the...$1,561.95 -
Out of stock
S&S Cycle - Black Granite 128" Big Bore Kit W/ Highlighted Cylinder Fins fits '17-'20 114" 117" M8 Engines
S&S Cycle
$1,559.95S&S Cycle - Black Granite 128" Big Bore Kit W/ Highlighted Cylinder Fins fits '17-'20 114" 117" M8 Engines This is a bolt-on kit that features the biggest cylinder bore possible with no machining of the crankcases necessary! It includes all of the...$1,559.95 -
Out of stock
S&S Cycle - Black/Highlighted 4.375" Stroke 129" Big Bore Cylinder & Piston Kit fits '17 & Up M8 Engines
S&S Cycle
$1,595.95S&S Cycle - Black/Highlighted 4.375" Stroke 129" Big Bore Cylinder & Piston Kit fits '17 & Up M8 Engines S&S Cycle's Big Bore Cylinder & Piston Kit delivers a mighty bore increase (4.320") that, in turn, delivers a huge power...$1,595.95 -
Out of stock
S&S Cycle - Black/Highlighted 4.5" Stroke 132" Big Bore Cylinder & Piston Kit fits '17 & Up M8 Engines
S&S Cycle
$1,649.95S&S Cycle - Black/Highlighted 4.5" Stroke 132" Big Bore Cylinder & Piston Kit fits '17 & Up M8 Engines S&S Cycle's Big Bore Cylinder & Piston Kit delivers a mighty bore increase (4.320") that, in turn, delivers a huge power...$1,649.95 -
Out of stock
S&S Cycle - Black 4.5" Stroke 132" Big Bore Cylinder & Piston Kit fits '17 & Up M8 Engines
S&S Cycle
$1,599.95S&S Cycle - Black 4.5" Stroke 132" Big Bore Cylinder & Piston Kit fits '17 & Up M8 Engines S&S Cycle's Big Bore Cylinder & Piston Kit delivers a mighty bore increase (4.320") that, in turn, delivers a huge power increase! It is...$1,599.95 -
Out of stock
S&S Cycle - 128" Power Packages fits '17-'21 M8 Water/Oil-Cooled Engines
S&S Cycle
$3,289.95 - $3,359.95S&S Cycle - 128" Power Packages fits '17-'20 M8 Water/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...$3,289.95 - $3,359.95
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.