Engine Components

S&S Two Gear Kits M8 Features: A two-gear set is required for gear-driven cams that do not come with secondary cam gears; includes outer cam drive gear, pinion drive gear and mounting hardware Due to the inherent characteristics of gear drives, you may experience more valve train noise with gear driven cams; oversized and undersized pinion gears are available to help achieve correct gear lash (sold separately) Made in the U.S.A. It is the installer's responsibility to check all clearances and follow all procedures in the S&S instructions and Harley-Davidson manual.

Machined steel, stock replacement roller chain drive sprockets fit 07-17 Twin Cam engines as direct replacements and work on early 99-06 engines when upgrading to the hydraulic cam chain tensioners using the roller chain Made in the U.S.A.

Feuling Cam Chains Feuling: Stock replacement chains Could be used for Conversion Cams Made in the U.S.A.

S&S High Compression Piston Kits Features: Significantly increase performance Provides more horsepower without sacrificing torque 10.6:1 compression ratio Simple EFI tuning with three calibration downloads for Dynojet® Power Vision® tuner

Black Edition M8 Pistons Features: BLACK EDITION PISTON KITS FOR M-EIGHT Feature ArmorX™? piston coating for superior protection in extreme conditions and reduced wear ArmorFit™? skirt coating auto-adjusts to the cylinder wall so there's no need to measure clearance; provides smooth, quiet, trouble-free operation Dome design for improved flame travel to maximize air/fuel burn efficiency High compression for added power Superfinish piston pin reduces friction and improves scuff resistance Enhanced pin oiling for improved lubrication and reduced friction Augmented ring land details improve ring seal and function Dedicated rings for precise fit, improved compression and oil control Fit OEM and Screamin' Eagle cylinder heads Kit includes two pistons, rings, piston pins and circlips Made in the U.S.A.

Wiseco High-Performance Piston Kits HIGH-PERFORMANCE FORGED PISTON KITS Wiseco's high-tech manufacturing ensures greater operating strength and lower expansion at high temperatures Kits include forged pistons with ArmorGlide™ coated skirts, rings, retainer clips, chrome piston pins Twin Cam pistons have ArmorPlating which improves ring seal, eliminates ring micro-welding, and improves the piston's ability to defend against detonation damage Piston kits are available with X-Ring package (.062 top ring, .062 compression ring and .158 oil ring), XC-Ring packages (.039 top ring, .062 compression ring, .158 oil ring) or VM-rings (1.2mm steel, positive twist, gas nitrided top ring, 1.2mm cast iron, taper under-hook scraper ring and 2.0mm three-piece, flex-vent oil ring with steel chrome-faced rails); VM-rings, X-Rings and XC-Rings will not interchange X- and XC-rings are identified by PART # in the application chart; X-Ring PART #s end with an "X" and XC-Ring PART #s end with an "XC" 103" kits require cylinder boring; 110" kit requires big-bore cylinders and case boring; X-Ring package (.0472" top ring, .0472" compression ring and .118" oil ring); recalibration required Pistons are made in the U.S.A. NOTE: Replacement rings include rings for one piston only. WARNING: Wiseco pistons that use VM-rings can only be fitted with Wiseco VM-rings; Wiseco pistons that use XC-rings can only be fitted with Wiseco XC-rings.

Hasting Replacement Piston Rings Features a cast or moly top ring Available in STD and Oversized Reverse torsional taper face second ring and easy "spiral on" three-piece oil rings Made In The USA

Thrashin Supply Co Points Covers Features: 6061 billet aluminum construction Made in the U.S.A.

S&S Pinion Side Race Features: Made in the U.S.A. OEM Replacement  Sold Each 03-17 Twin Cam/00-03 Twin Cam B

Replacement Crank Sensor Features: Direct replacement for OEM sensors  100% tested for functionality 

Replacement Cam Chain Tensioner Kits Features:  Heavy Duty Cam Chain and Long Life Tensioner Pads Replacement Inner and Outer Hydraulic Style Tensioners for Late Models  Cam Chain Guide Available 

Kibblewhite Cylinder Studs Features: These high performance cylinder studs are made from 180,000 psi yield strength, fine grain, heat treated, premium grade 8740 material Threads are rolled after heat treating to insure maximum compressive stresses are retained, insuring maximum strength, and longest fatigue life possible The case end threads are designed to have slight interference fit to maintain good thread contact at hight temps Studs are center less ground to ensure concentricity, and finished with a premium black oxide treatment

Feuling Sump Plug HELP ELIMINATE SUMPING ISSUES!Eliminate blocking the internal engine case scavenge pick up hole with the FEULING bottom case Short Sump Plug. A common issue with both Twin Cam and Milwaukee Eight engines (more common with Milwaukee Eights) is the sump plug can block off the internal scavenge (return) pick up port. By using a shorter plug, we eliminate the possibility of the plug blocking off this cross port.NOTE: The M-EIGHT main sump cross port on the inside of the M-Eight engine case is in a slightly different location & height in each engine case. This cross port is created when the bottom plug hole is machined and tapped by the factory. The machining breaks through the casting wall, creating the sump port. Whereas the Twin Cam engine cross scavenge pick up hole is a machined bore, and is in the same location in every engine case.The further the bottom plug installs into the case, the more of the scavenge cross port is blocked off. For optimum oil scavenging & lower sump levels, it is advisable to use FEULINGs new Short Sump Plug which will ensure the cross sump port is wide open and allows the oil pump to pull as much as possible from the sump.The FEULING Plug is 0.265 Tall vs. OEM 0.465.  

Chris Rivas Rocket Cams Big Bore Cylinder Kit There 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 quality and durable cylinder and piston big bore kits, with all components made right here, in the usa! the cylinders are casted from premium materials and perfectly fitted and matched to their paired up wiseco pistons sets.Rocket cams cylinders come power coated textured black with machine fins, for a perfect blend to an oe harley motor.All kits come with cometic head and base gaskets and are ready for install.This ultimate combination of industry leading manufacturers and experienced racers, will bring bolt on horsepower to a new level.See the chart below for our cam and component suggestions to get the best results and customer satisfaction. Features: M8 128" CYLINDER KIT Brings stock M8 114" and 117" motors to 128" 4.5" Stroke and 11:1 Compression Wiseco forged pistons with coated skirts .040 head gasket set M8 124" CYLINDER KIT Brings stock M8 107" motors to 124" 4.375" Stroke and 11:1 Compression Wiseco forged pistons with coated skirts .030 head gasket set TWIN CAM 110" CYLINDER KIT Brings 07-16 stock 96" and 103" motors to 110" 4.375" Stroke and 10.5:1 Compression Wiseco forged pistons

Timken Left Side Bearing and Shims Quality equals or exceeds OEM specifications Made in the U.S.A.