Engine Components

S&S Flywheel Assembly For Harley Milwaukee 8 The flywheels are the heart of any performance engine and S&S Cycle has been perfecting the art for over six decades. Stronger, more durable, and trued to a spec others can only dream of, the new cranks for the Milwaukee-Eight platform are the best of the best to build your high performance engine around. Features: Heat treated 4140 material is harder & more than twice as strong as stock Stronger assembly eliminates need to weld crankpin Capable of higher RPM - More available power S&S High strength connecting rods are designed with Finite Element Analysis to eliminate weak spots and handle more power Perfect for gear drive cams 4-1/2" Stroke (114 or 128ci) 4-3/8" Stroke (107 or 124ci) 4-5/8" Stroke - Use S&S 131 Kits Note: Full width wristpin connecting rods require performance pistons / Tapered wristpin connecting rods compatible with stock pistons

S&S Forged Rocker Arms for M8 S&S now offers an economical solution for stock rebuilds, and mild performance upgrades. S&S standard rocker arms are forged from 8620 steel for greater strength than stock forged or cast steel rocker arms. In addition, they feature the same 3/4" long rocker shaft bushings that the S&S roller rocker arms do. Thousands of hours of engine testing have proved them to be superior to other non-roller rocker arms. The 3/4" long bronze bushings provide 50% more load bearing area than the 1/2" long bushings used in stock and other aftermarket rocker arms. Features: Forged steel construction Contains 2 front and 2 rear rocker arms Made in the USA

S&S Top End Guardian Kit  Building your M8 for big power? We've got the parts you need to bulletproof the top end of your valvetrain in one convenient kit! S&S performance parts are direct replacement for OEM pieces, but are stronger and more durable, giving your M8 the reliability it needs as you build big HP and Torque numbers. Rocker Arm shafts, Rocker Arm Stud Kit, Head Bolt Kit and Performance Roller Rocker Arms are included in this kit that is the perfect topper for your high performance M8 build Rocker Arm Shafts Replace broken or worn OEM pieces with stronger, more durable S&S performance parts Direct replacement for stock parts Hardened and surface ground for ultimate precision and durability Rocker Arm Stud Kit Extend the life of your cylinder heads Prevent damage to Rocker Arm Towers Install studs and safely re-torque nuts Black Oxide Finish 12 pt Nuts Head Bolt Kit Heat Treated 8640 Steel 200,000 psi Ultimate Tensile Strength 14% increases in strength over stock Stronger material than stock Head bolts Durable Black Oxide Coating 9/16" 12 point head with integral washer Formed threads Cold Formed Head Reusable Forged Roller Rocker Arms Forged from 8620 steel for greater strength Designed using Finite Element Analysis (FEA) Rollers eliminate thrusting on valves for decreased wear on the valve train Rocker geometry is better suited to high lift cams Bushings are 50% longer than stock, increasing time between rebuilds Larger surface area on the thrust surfaces reduces wear on the heads Oil is sprayed directly on the valve springs, reducing potential for breaking a valve due to over-heating (stock rockers tend to oil the rocker boxes, not the valves) Compatible with stock or S&S CNC heads 1.640 Ratio Capable of .650" max Valve Lift Serviceable and rebuildable for generations of durabilty A must have for cams with .550" or greater lift!

S&S Forged Roller Rocker Arm 86-17 HD Fits 1984-'17 HD® big twin engines, 1986-'19 HD® Sportster® models, and 1994-'02 Buell®. Our forged steel roller rocker arms were designed for superior strength and to eliminate the failure-prone stress areas found in some other rockers. S&S® roller rockers are forged from 8620 steel, heat-treated, and then shot-peened for additional strength and protection from fatigue. Our rockers also utilize 3/4" long bronze bushings, compared to the more common 1/2" long bushings or needle bearings. The end result is what we believe to be the finest rocker arm available anywhere, for any price. Extremely durable rollers reduce valve stem side thrusting with high lift cams. Superior wear and fatigue resistance even in the most demanding.(2 front and 2 rear rocker arms)

Feuling HP+ Series Oiling System For Harley Feuling® oiling system kits combine all the needed components to finish your engines oiling system. Kits increase oil pressure, oil volume, engine oil flow and return oil scavenging for a quieter and smoother running engine. Includes a billet 7075 hard anodized oil pump which is 50% harder and stronger than the factory pump holding tighter tolerances under temperature. HP+ hydraulic lifters have a full .200 of total travel designed with a slower bleed down rate to handle heavy valve spring pressures, increase engine RPM before valve float and feature increased roller clearance for steep ramped camshafts and clearance for the camshaft front exhaust lobe flange. High Flow billet camplate made from 7075 aluminum which is 50% harder and stronger than the factory camplates. Feuling® increases oil flow and volume by enlarging the oil pump reservoirs and critical oil passages including matching the oil port holes throughout the camplate to the port holes in the engine case which increases engine oil flow to the lifters, piston cooling jets, crankshaft and rod bearings. Features: 15-25 degree cooler engine temperatures 15-30 degree cooler oil temperatures 10-30 more PSI of oil pressure Reduces wet sumping, blow by and oily air cleaners Test results show 2 HP gain and 2 ft/lbs of TQ gain to the rear wheel Feuling® test results show as much as 50% reduction of engine sump oil level Made in the U.S.A.

Valve Spring Kit Kibblewhite Hd .600 Lift Twin Cam 88" Wound from premium kobe super-clean chrome silicon wire.Kpmi valve springs are heat-treated, stress relieved and shot peened to insure maximum performance and life.Springs are engineered for each specific application using proprietary advanced spring design simulation, and analysis software.Engineers pay special attention to cam and spring harmonics, stress, mass and operating rpm.

Valve Spring Kit Kibblewhite Hd .600 Lift Twin Cam 88-103" Wound from premium kobe super-clean chrome silicon wire.Kpmi valve springs are heat-treated, stress relieved and shot peened to insure maximum performance and life.Springs are engineered for each specific application using proprietary advanced spring design simulation, and analysis software.Engineers pay special attention to cam and spring harmonics, stress, mass and operating rpm.

Trask MystFree Breather Kit The Trask Mystfree kit is made from durable billet aluminum. This product is designed to drain oil into the rocker more efficiently. If you're looking to reduce oil misting from the breather on your Touring, Dyna, or Softail Harley Davidson, then this is exactly what you need. Trask is a brand you can count on, you won't be disappointed with the Mystfree kit. Features: Machined 6061-T6 billet aluminum construction Helps oil drain more efficiently into the rocker Reduces oil misting coming from the engine breathers Made in the U.S.A.

S&S Twin Cam Engine Cases Features: Replacement Twin Cam "A" engine cases for stock H-D chassis only (carb and EFI) Feature greater overall strength than stock crankcases Strong, dependable Timken®-style sprocket shaft bearings Clearanced for strokes up to and including 5" All passages between the crankcase cam support plate are O-ring sealed Compatible with most stock components Cam chest has clearance for up to .675" lift cams Include S&S crankcase breather reed valve designed to eliminate oil carry-over and oil scavenging problems Rear motor mount bolts directly to the stock transmission; fully compatible with the stock primary, charging system, and other stock components Made in the U.S.A. This project requires a skilled technician. It is the responsibility of the person assembling the parts to check all clearances and assembly specifications.

S&S Early Cases Features: Cast from A356 T-6 heat-treated aluminum alloy Include crankcase bolts, washers and nuts, cylinder mounting studs, timing hole plug, magnetic drain plug, assorted breather and oil line fittings, top end oil screen spring and plug, sprocket shaft Timken® bearing assembly, oil seal, pinion shaft main bearing race, cam needle bearing assembly, oil pump shaft bushings and installation instructions Use Timken style sprocket shaft bearings and 1958 and later pinion bearings (will not accept 1957 and earlier flywheels) Bearing races are all line honed and breather cavity is precision machined to optimize breather timing for maximum oil scavenging Machined for 3.4375" cylinders and tapped 1/4"-20 for gear covers, oil pump, tappet guides, timer and timer advance 65 models use 65 alloy inner primary Drilled for 5/16" generator mounting bolts 63-65 models with outside oil lines must use oil port to the rear of the tappet block or oil port in gear cover and use custom oil lines Generator crankcase gear kit (includes circuit breaker drive gear, idler gear, circuit breaker gear and shims) and shafts must be purchased separately Made in the U.S.A.

Eastern Lefty Bearing Kit Features: Kit Includes 2 OEM #8972 Thrust Washers  1 OEM #24605-07 Bearing  1 OEM #35114-02 Retaining Ring  1 Bearing Race Bearing and Race available separate 

Jims Piston Oiling Jet Kit Features: Modified to handle upgraded stroker flywheels stroke Works with all stock and high-performance flywheel assemblies Made in the U.S.A.

S&S M8 Cylinders Features: - Bolt on Cylinder Set  - Bored slightly under nominal size and are not honed - Sold in Pairs  - Made in the USA

S&S Quickee Pushrods with Covers Features: Kits include four S&S adjustable pushrods or Quickee pushrods, four pushrod covers, O-rings Pushrods are manufactured from chromoly steel for superior strength Pushrod covers are chrome-plated Installation does not require the removal of the rocker boxes Made in the U.S.A. Requires the removal of tappet blocks for installation.

Replacement Tappet Covers Features: - Available in Chrome or Black  - Comes with new bolts and replacement gaskets  - OEM Replacement