Big Bore Kits
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Out of stock
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 -
Out of stock
Cometic - C10221-030 - Top End Kit M8 4.185" 120Cu .030"H/G
Cometic
$238.10Cometic - C10221-030 - Top End Kit M8 4.185" 120Cu .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 -
Out of stock
Cometic - C10222 - Top End Kit M8 4.200" 121Cu .040"H/G
Cometic
$238.10Cometic - C10222 - Top End Kit M8 4.200" 121Cu .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 -
Out of stock
Cometic - C10222-030 - Top End Kit M8 4.200" 121Cu .030"H/G
Cometic
$238.10Cometic - C10222-030 - Top End Kit M8 4.200" 121Cu .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 -
Out of stock
Cometic - C10223 - Top End Kit M8 4.250" 124Cu .040"H/G C Only
Cometic
$238.10Cometic - C10223 - Top End Kit M8 4.250" 124Cu .040"H/G C OnlyFeaturesAt 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 -
Out of stock
Cometic - C10223-030 - Top End Kit M8 4.250" 124Cu .030"H/G C Only
Cometic
$238.10Cometic - C10223-030 - Top End Kit M8 4.250" 124Cu .030"H/G C OnlyFeaturesAt 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 -
Out of stock
Wiseco - K2787 - M8 Big Bore Pistons 124" 11:1 Comp
Wiseco
$576.95Wiseco - 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...$576.95 -
Out of stock
Cometic - C10224 - M8 4.320" 128Cu T/E Kit040" H/G Oe#25700729
Cometic
$238.10Cometic - C10224 - M8 4.320" 128Cu T/E Kit040" H/G Oe#25700729FeaturesFitment2018-2021Harley DavidsonFLHR Road King2018-2021Harley DavidsonFLHRXS Road King Special2018-2021Harley DavidsonFLHX Street Glide2018-2021Harley DavidsonFLHXS Street Glide...$238.10 -
Out of stock
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 -
Out of stock
S&S Cycle - 09040165 - 129" Power Pack - 550 Chain Drive - Oil Cooled - Wrinkle Black w/o Highlight Fins - M8
S&S Cycle
MSRP: $3,359.95$3,294.95S&S CYCLE - 09040165 - 129" Power Pack - 550 Chain 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: $3,359.95$3,294.95 -
Out of stock
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 -
Out of stock
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 -
Out of stock
V-Twin - 11-1259 - 107 inch Big Bore Twin Cam Cylinder Kit
Motorshop
$480.26V-Twin - 11-1259 - 107 inch Big Bore Twin Cam Cylinder KitDescriptionTC-88 Big Bore cylinder kit includes forged 10.5:1 piston kit and silver cylinders. This kit requires case machining and fits a stock 4" stroke flywheel.The cylinders have a 4-1/8" bore...$480.26 -
Out of stock
V-Twin - 11-1253 - 83 inch Evolution Big Bore Cylinder Kit
Motorshop
$821.07V-Twin - 11-1253 - 83 inch Evolution Big Bore Cylinder KitDescriptionEvolution 83" Big Bore bolt on black cylinder kit includes 10:1 compression Wiseco forged piston kit, which has been honed for final fitment.Cylinders are aluminum and features a cast...$821.07 -
Out of stock
V-Twin - 11-1196 - M8 Big Bore Black Cylinder Set
Motorshop
$488.03V-Twin - 11-1196 - M8 Big Bore Black Cylinder SetDescriptionBlack 4.250" big bore cylinder set with machined edge fins increase the bore size from 124" to 128". Features a slightly larger fin area for better heat dissipation and increased cooling.For use...$488.03 -
Out of stock
V-Twin - 11-0510 - Big Bore Gasket and Parts Kit
Motorshop
$100.93V-Twin - 11-0510 - Big Bore Gasket and Parts KitDescriptionMagnum cylinder small parts kit is for installing 3-5/8" barrels on Shovelhead cases. Kit includes 2 head gaskets, base gaskets, 8 cylinder base nuts and 10 head bolts with washers.*NOTE: The...$100.93 -
Out of stock
V-Twin - 11-0075 - 95 inch Big Bore Twin Cam Cylinder and Piston Kit
Motorshop
$470.64V-Twin - 11-0075 - 95 inch Big Bore Twin Cam Cylinder and Piston KitDescription95" Big Bore bolt on cylinder kit will increase TC-88 engine to 95". Kit includes silver cylinders with 10.25:1 cast pistons. Pistons are pre fitted to cylinders with head...$470.64 -
Out of stock
V-Twin - 11-0074 - 95 inch Big Bore Black Cylinder Kit
Motorshop
$543.91V-Twin - 11-0074 - 95 inch Big Bore Black Cylinder KitDescription95" Big Bore bolt on cylinder kit will increase TC-88 engines to 95".Kit includes two 95" black cylinders, two 10.25:1 compression cast pistons with rings pre fitted to cylinder with...$543.91 -
Out of stock
S&S Cycle - 310-1052B - 124" Power Package - Chain Drive - Highlighted Fins - Chrome Pushrod Tubes - 107" M8
S&S Cycle
MSRP: $3,265.95$3,109.95S&S Cycle - 310-1052B - 124" Power Package - Chain Drive - Highlighted Fins - Chrome Pushrod Tubes - 107" M8FeaturesMade in the USABig Bore Kit107" to 124" Big bore kitBolt on kitNo case matching requiredForged pistons11:1 Compression ratioOil Pump/Cam...MSRP: $3,265.95$3,109.95 -
Out of stock
S&S Cycle - 310-1050B - 124" Power Package - Chain Drive - Highlighted Fins - Chrome Pushrod Tubes - 107" M8
S&S Cycle
MSRP: $3,265.95$3,109.95S&S Cycle - 310-1050B - 124" Power Package - Chain Drive - Highlighted Fins - Chrome Pushrod Tubes - 107" M8FeaturesMade in the U.S.A.Big Bore Kit107" to 124" Big bore kitBolt on kit.No case machining requiredForged pistons11.1 Compression ratioOil...MSRP: $3,265.95$3,109.95 -
Out of stock
S&S Cycle - 310-1109B - 128" Power Package - Chain Drive - Black Granite with Highlighted Fins - 114"/117" M8
S&S Cycle
MSRP: $3,265.95$3,169.95S&S Cycle - 310-1109B - 128" Power Package - Chain Drive - Black Granite with Highlighted Fins - 114"/117" M8FeaturesMade in the USABig Bore KitBig-bore bolt-on kit increases 114"/117" with 4-1/2" stroke M-Eight to 128" with no case machining...MSRP: $3,265.95$3,169.95 -
Out of stock
S&S Cycle - 310-1110A - 128" Power Package - Gear Drive - Black Granite with Highlighted Fins - 114"/117" M8
S&S Cycle
$3,460.95S&S Cycle - 310-1110A - 128" Power Package - Gear Drive - Black Granite with Highlighted Fins - 114"/117" M8FeaturesMade in the USABig Bore KitBig-bore bolt-on kit increases 114"/117" with 4-1/2" stroke M-Eight to 128" with no case machining...$3,460.95 -
Out of stock
S&S Cycle - 310-1103B - 128" Power Package - Chain Drive - Wrinkle Black with Highlighted Fins - 114"/117" M8
S&S Cycle
MSRP: $3,265.95$3,169.95S&S Cycle - 310-1103B - 128" Power Package - Chain Drive - Wrinkle Black with Highlighted Fins - 114"/117" M8FeaturesMade in the USABig Bore KitBig-bore bolt-on kit increases 114"/117" with 4-1/2" stroke M-Eight to 128" with no case machining...MSRP: $3,265.95$3,169.95 -
Out of stock
S&S Cycle - 310-1056B - 124" Power Package - Chain Drive - Highlighted Fins - Black Pushrod Tubes - 107" M8
S&S Cycle
MSRP: $3,265.95$3,109.95S&S Cycle - 310-1056B - 124" Power Package - Chain Drive - Highlighted Fins - Black Pushrod Tubes - 107" M8FeaturesMade in the USABig Bore Kit107" to 124" Big bore kitBolt on kitNo case matching requiredForged pistons11:1 Compression ratioOil Pump/Cam...MSRP: $3,265.95$3,109.95 -
Out of stock
S&S Cycle - 310-1105B - 128" Power Package - Chain Drive - Wrinkle Black with Non-Highlighted Fins - 114"/117" M8
S&S Cycle
MSRP: $3,265.95$3,109.95S&S Cycle - 310-1105B - 128" Power Package - Chain Drive - Wrinkle Black with Non-Highlighted Fins - 114"/117" M8FeaturesMade in the USABig Bore KitBig-bore bolt-on kit increases 114"/117" with 4-1/2" stroke M-Eight to 128" with no case machining...MSRP: $3,265.95$3,109.95 -
Out of stock
S&S Cycle - 310-1059A - 124" Power Package - Gear Drive - Non-Highlighted Fins - Black Pushrod Tubes - 107" M8
S&S Cycle
MSRP: $3,695.95$3,289.95S&S Cycle - 310-1059A - 124" Power Package - Gear Drive - Non-Highlighted Fins - Black Pushrod Tubes - 107" M8FeaturesMade in the USABig Bore Kit107" to 124" Big bore kitBolt on kitNo case matching requiredForged pistons11:1 Compression ratioOil Pump/Cam...MSRP: $3,695.95$3,289.95 -
Out of stock
S&S Cycle - 310-1104A - 128" Power Package - Gear Drive - Wrinkle Black with Highlighted Fins - 114"/117" M8
S&S Cycle
MSRP: $3,460.95$3,359.95S&S Cycle - 310-1104A - 128" Power Package - Gear Drive - Wrinkle Black with Highlighted Fins - 114"/117" M8FeaturesMade in the USABig Bore KitBig-bore bolt-on kit increases 114"/117" with 4-1/2" stroke M-Eight to 128" with no case machining...MSRP: $3,460.95$3,359.95 -
Out of stock
S&S Cycle - 310-1058A - 124" Power Package - Gear Drive - Highlighted Fins - Black Pushrod Tubes - 107" M8
S&S Cycle
MSRP: $3,460.95$3,359.95S&S Cycle - 310-1058A - 124" Power Package - Gear Drive - Highlighted Fins - Black Pushrod Tubes - 107" M8 Features Made in the USA Big Bore Kit 107" to 124" Big bore kit Bolt on kit No case matching required Forged pistons 11:1 Compression...MSRP: $3,460.95$3,359.95 -
Out of stock
S&S Cycle - 310-1055A - 124" Power Package - Gear Drive - Highlighted Fins - Black Pushrod Tubes - 107" M8
S&S Cycle
$3,427.95S&S Cycle - 310-1055A - 124" Power Package - Gear Drive - Highlighted Fins - Black Pushrod Tubes - 107" M8FeaturesMade in the U.S.A.Big Bore Kit107" to 124" Big bore kitBolt on kit.No case machining requiredForged pistons11.1 Compression ratioOil...$3,427.95 -
Out of stock
S&S Cycle - 310-1053A - 124" Power Package - Gear Drive - Highlighted Fins - Chrome Pushrod Tubes - 107" M8
S&S Cycle
MSRP: $3,460.95$3,359.95S&S Cycle - 310-1053A - 124" Power Package - Gear Drive - Highlighted Fins - Chrome Pushrod Tubes - 107" M8FeaturesMade in the USABig Bore Kit107" to 124" Big bore kitBolt on kitNo case matching requiredForged pistons11:1 Compression ratioOil Pump/Cam...MSRP: $3,460.95$3,359.95 -
Out of stock
S&S Cycle - 920-0071 - Piston Kit - 1250cc Big Bore - XL
S&S Cycle
MSRP: $499.95$484.95S&S Cycle - 920-0071 - Piston Kit - 1250cc Big Bore - XLFeaturesPiston kit includes forged pistons, rings, wrist pin and clips for a complete motorDeck height is 1.207"Made in the USAThis kit is not compatible with XR1200 or RH Sportster.883 models...MSRP: $499.95$484.95 -
Out of stock
S&S Cycle - 920-0070 - Piston Kit - 1250cc Big Bore - XL
S&S Cycle
MSRP: $549.95$484.95S&S Cycle - 920-0070 - Piston Kit - 1250cc Big Bore - XLFeaturesPiston kit includes forged pistons, rings, wrist pin and clips for a complete motorDeck height is 1.207"Made in the USAThis kit is not compatible with XR1200 or RH Sportster.883 models...MSRP: $549.95$484.95 -
Out of stock
S&S Cycle - 310-1227 - 129" Power Package Engine Performance Kit - Gear Drive - Oil Cooled - Highlighted Fins - M8
S&S Cycle
MSRP: $3,559.95$3,359.95S&S Cycle - 310-1227 - 129" Power Package Engine Performance Kit - Gear 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...MSRP: $3,559.95$3,359.95 -
Out of stock
S&S Cycle - 310-1228 - 129" Power Package Engine Performance Kit - Gear Drive - Oil Cooled - Non-Highlighted Fins - M8
S&S Cycle
MSRP: $3,559.95$3,359.95S&S Cycle - 310-1228 - 129" Power Package Engine Performance Kit - Gear Drive - Oil Cooled - Non-Highlighted Fins - M8FeaturesTransform 107" oil-cooled M8 into 129" with no case machining requiredBig bore cylinders come with matching cam, cam plate and...MSRP: $3,559.95$3,359.95 -
Out of stock
S&S Cycle - 310-1238 - 132" Power Package Engine Performance Kit - Chain Drive - Oil Cooled - Highlighted Fins - M8
S&S Cycle
MSRP: $3,559.95$3,359.95S&S Cycle - 310-1238 - 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...MSRP: $3,559.95$3,359.95 -
Out of stock
S&S Cycle - 310-1232 - 132" Power Package Engine Performance Kit - Gear Drive - Oil Cooled - Highlighted Fins - M8
S&S Cycle
$3,559.95S&S Cycle - 310-1232 - 132" Power Package Engine Performance Kit - Gear 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...$3,559.95 -
Out of stock
S&S Cycle - 310-1236 - 132" Power Package Engine Performance Kit - Gear Drive - Water Cooled - Highlighted Fins - M8
S&S Cycle
MSRP: $3,559.95$3,359.95S&S Cycle - 310-1236 - 132" Power Package Engine Performance Kit - Gear 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...MSRP: $3,559.95$3,359.95 -
Out of stock
S&S Cycle - 310-1234 - 132" Power Package Engine Performance Kit - Gear Drive - Oil Cooled - Non-Highlighted Fins - M8
S&S Cycle
MSRP: $3,559.95$3,359.95S&S Cycle - 310-1234 - 132" Power Package Engine Performance Kit - Gear 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...MSRP: $3,559.95$3,359.95 -
Out of stock
S&S Cycle - 310-1230 - 132" Power Package Engine Performance Kit - Gear Drive - Water Cooled - Highlighted Fins - M8
S&S Cycle
$3,559.95S&S Cycle - 310-1230 - 132" Power Package Engine Performance Kit - Gear 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...$3,559.95 -
Out of stock
S&S Cycle - 310-1224 - 129" Power Package Engine Performance Kit - Gear Drive - Oil Cooled - Highlighted Fins - M8
S&S Cycle
MSRP: $3,559.95$3,359.95S&S Cycle - 310-1224 - 129" Power Package Engine Performance Kit - Gear 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...MSRP: $3,559.95$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.