Engine

S&S Cycle - 475 Cam Chain Drive Camchest Kit W/ Gloss Black Pushrod Tubes fits '17-'20 Twin-Cooled M8 Touring Models Features Camshaft gear drive kits increase valve timing accuracy by eliminating timing chain lash and loosely-fit stock chain...

S&S Cycle - 475 Cam Gear Drive Camchest Kit W/ Chrome Pushrod Tubes fits '17-'20 Oil-Cooled M8 Models Features Camshaft gear drive kits increase valve timing accuracy by eliminating timing chain lash and loosely-fit stock chain drive Reverses...

S&S Cycle - 475 Cam Gear Drive Camchest Kit W/ Chrome Pushrod Tubes fits '17-'20 Twin-Cooled M8 Models Features Camshaft gear drive kits increase valve timing accuracy by eliminating timing chain lash and loosely-fit stock chain drive Reverses...

S&S Cycle - 475 Cam Gear Drive Camchest Kit W/ Gloss Black Pushrod Tubes fits '17-'20 Oil-Cooled M8 Models Features All parts in each kit are matched to ensure superior quality, fit, finish and performance Oil pump and cam plate are...

S&S Cycle - 4⅛" Bore Cylinders fits '07-'17 Twin Cam Engines W/ 124" Hot Set Up Kits These Cylinders are built for 124" Hot Set Up Kits utilized in '99-'17 Twin Cam models and are bored slightly under the normal size and are not honed. NOTE:...

S&S Cycle - 4⅛" Bore Cylinders fits '99-'06 Twin Cam Engines W/ 124" Hot Set Up Kits These Bore Cylinders are built for 124" Hot Set Up Kits utilized in '99-'17 Twin Cam models and are bored slightly under the normal size and are not honed. NOTE:...

S&S Cycle - 4⅝" Stroke Flywheel Assembly W/ Balancer Gear & Full Wrist Pin fits '17-'20 M8 Softail Models This Stroke Flywheel Assembly W/ Balancer Gear & Full Wrist Pin comes with S&S high-strength connecting rods that are ideal for...

S&S Cycle - 540 Cam Chain Drive Camchest Kit W/ Chrome Pushrod Tubes fits '17-'20 Oil-Cooled M8 Touring Models Features All parts in each kit are matched to ensure superior quality, fit, finish and performance Oil pump and cam plate are...

S&S Cycle - 540 Cam Chain Drive Camchest Kit W/ Chrome Pushrod Tubes fits '17-'20 Twin-Cooled™ M8 Touring Models Features All parts in each kit are matched to ensure superior quality, fit, finish and performance Oil pump and cam plate are...

S&S Cycle - 76cc High Compression Performance Cylinder Heads fits '84-'99 Evolution Big Twin Models - Black Powdercoat Great news: S&S heads are now available to be used with stock-style flat-top pistons! The kits are fully assembled and come...

S&S Cycle - Aluminum Hydraulic Cam Chain Tensioners Kit - fits '07-'17 Twin Cam, '06 Dyna Features: For use in stock 07-17 Twin Cam engines or 99-06 Twin Cam engines with a hydraulic upgrade cam plate like the S&S TC3bodies machined from 6061...

S&S Cycle - Billet Cam Plate fits  '17-'21 Harley M8 Models Features: Precision machined from billet aluminum Blue anodized finish Passage plugs are removeable for servicing Made in U.S.A Fitment 2020 Harley-Davidson Softail...

S&S Cycle - Black 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 increase! It is...

S&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...

S&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...

S&S Cycle - Black Granite 131" Stroker Cylinder & Piston Kit W/ Highlighted Cylinder Fins fits '17-'21 M8 Engines S&S Cycle's Stroker Cylinder & Piston Kit is a bolt-on kit that is compatible with the stock crankcases and features...

S&S Cycle - Black Granite 4¼" Bore M8 Cylinders W/ Highlighted Cylinder Fins fits '17-'20 M8 Engines  These cylinders are bored slightly under nominal size and are not honed. Features Bolt on Cylinder Set For M8 Models Sold in...

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) This Big Bore Kit produces outstanding outcomes with stock cylinder heads. It comes complete with cylinders, pistons,...

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) This Big Bore Kit produces outstanding outcomes with stock cylinder heads. It comes complete with cylinders, pistons,...

 S&S Cycle - Black Powdercoat Evolution-Style Aluminum Cylinders W/ Machined Fin Edges fits '84-'99 Evolution Big Twin Engines S&S Cycle's Evolution-Style Aluminum Cylinders are stock replacement cylinders featuring a 3½" bore with a...

S&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...

S&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...

S&S Cycle - Chain-Drive Camchest Kits W/ 509C Standard Cams for '99-'06 Twin Cam (Except '06 Dyna) Features Upgrade to S&S bolt-in performance chain-drive or gear-drive camshafts Improves engine performance - higher lift and optimized cam...

S&S Cycle - Chain-Drive Camchest Kits W/ 510C Standard Cams for '99-'06 Twin Cam (Except '06 Dyna) Features Upgrade to S&S bolt-in performance chain-drive or gear-drive camshafts Improves engine performance - higher lift and optimized cam...

S&S Cycle - Chain-Drive Camchest Kits W/ 551CE Easy Start Cams for '99-'17 Twin Cam This camchest kit is available in two different fitments: (1) For '07-'17 Twin Cam and '06 Dyna, or (2) For '99-'06 Twin Cam (Except '06 Dyna). Please double-check...

S&S Cycle - Chain-Drive Camchest Kits W/ 585C Standard Cams for '07-'17 Twin Cam, '06 Dyna Features Upgrade to S&S bolt-in performance chain-drive or gear-drive camshafts Improves engine performance - higher lift and optimized cam...

S&S Cycle - Chain-Drive Camchest Kits W/ 585CE Easy Start Cams for '99-'06 Twin Cam (Except '06 Dyna) NOTE: Part # 0925-1108 requires the use of high-lift valve springs (See "Also Bought" tab). Features Upgrade to S&S bolt-in performance...

S&S Cycle - Chrome Die-Cast Rocker Box fits '99-'17 Twin Cam Motors Features Positive O-ring seal ensures leak-free operation Include rocker boxes, gaskets and mounting bolts The assembler must supply rocker shafts and and rocker arms for all...