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Big Twin®
Zipper’s ’99-’06 Twin Cam® Blueprinted Big Bore Cylinder Kits
$0.00
KITS FOR 1999-2006 TWIN CAM® ENGINES
Factory 1999-2006 Twin Cam® engines are equipped with 4” stroke crankshafts. The factory cylinder bore size of 3-3/4” yields the 88” displacement. We can turn your 88” engine into either a 95 or a 98”, simply by resizing the factory cylinders.
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Not legal for sale or use in California on any pollution controlled motor vehicle. Not legal for sale or use on any EPA pollution controlled motor vehicle.
*To ensure you enjoy a premium experience with a Zipper's Kit, Please fill out a Job Order Sheet prior to completing an order on the website. Click here for Zipper's Job Order SheetPlease choose your application below then select the radio button next to the item to purchase, then add to cart
Zipper’s ’07-Up Twin Cam® Blueprinted Big Bore Cylinder Kits
$0.00
KITS FOR 2007-UP TWIN CAM® ENGINES
Factory 2007-up Twin Cam® engines are equipped with 4-3/8” stroke crankshafts. The factory cylinder bore size of 3-3/4” yields the 96” displacement, which was gradually increased to 3-7/8” starting in 2010 for 103” displacement. We can turn your 96” engine into either a 103 or a 107”, and your 103 into a 107” simply by resizing the factory cylinders.
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Not legal for sale or use in California on any pollution controlled motor vehicle. Not legal for sale or use on any EPA pollution controlled motor vehicle.
***To ensure you enjoy a premium experience with a Zipper's Cylinder Kit, Please fill out a Job Order Sheet prior to completing an order on the website. Click here for Zipper's Job Order SheetPlease choose your application below then select the radio button next to the item to purchase, then add to cart
Zipper’s 117” Stock Stroke-Big Bore Kit For 2007-Up Engines
$0.00
These cylinders are designed to be used with a stock 96” (4-3/8” stroke) crankshaft to increase displacement from 96” to 117”. Can also be used in 1999-2006 engines as long as the crankshaft is changed to 4-3/8” stroke. Complete kits include cylinders, forged flat top piston kit, head and base gaskets. Requires case boring (instructions included) and stroker piston cooling jet kit. These cylinders are .045” longer than stock and require a slightly longer intake manifold or throttle body.
In compliance with ARB emissions laws, this product is not sold or shipped to California.
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Zipper’s Cushion-Drive Chain Conversion Kits for 2015-up Indian Scout Models
$0.00
Indian Scout Chain Conversion Kits Now Available! Whether you’re interested in a different final drive ratio or added driveline strength this kits will make your life easier. This bolt-on kit includes a specially CNC-machined billet hub adapter that retains the factory cush drive and allows the use of bolt-on aluminum rear sprockets. The fully assembled adapter contains (3) ball bearings and spacers required for proper wheel alignment, along with extra-strong 180,000 PSI tensile (20% stronger than grade 8) polished stainless steel sprocket bolts. Front and rear sprockets are included, steel front in 22T, aluminum rear sprocket your choice of teeth in 46-57 tooth spread. Chain is not included in kit price; choose chain finish and style from the options list.
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#413-413 Red Shift Cams® 559V2 Cams
$279.95
559V2: Our most popular performance cam for 80-88” Evolution® engines, used in our 80/80 kit. Big, broad power from 2,200 to 6,000 RPM, this cam delivers an extra-wide torque curve that tops out at over 90 ft lbs of torque, HP in the mid to upper 80’s. Designed to be used with 9.5 to 10:1 compression. Uncomplicated head set-up for .560” lift, minor case clearance required.
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Not legal for sale or use in California on any pollution controlled motor vehicle. Not legal for sale or use on any EPA pollution controlled motor vehicle.
Zipper's is here to help, if you have a question(s) please scroll down and fill out the form and hit send. We will review your question(s) and we will be in contact.
Zipper’s Pro-Taper Twin Cam®/XL® Pushrods
$0.00
There’s Power in These Pushrods! Admittedly, the weakest link in a Harley® performance engine is the valve train stiffness, or rather the lack of it. These high performance adjustable pushrods add much needed stiffness to the valve train.
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Zipper’s Custom Length Pro-Taper Pushrods for XL, Twin Cam and EVO Engines
$0.00
Our Pro-Taper pushrods are also available for the professional engine builder who wants the stiffest adjustable pushrods available. The weakest link in an adjustable pushrod is the adjuster itself; keeping the pushrod adjuster as short possible helps maintain the highest resistance to deflection. For this reason we offer the Pro-Taper pushrods, sold each, in the fully collapsed lengths listed below so you can order exactly the lengths you need to keep the adjuster extension at a minimum, for maximum rigidity. Pushrods are chrome moly, .095” wall, 7/16” diameter at the bottom tapering to 3/8” at the top with a full radius rocker ball tip. Adjuster thread is 5/16” x 1.250” length, 32 TPI.
Note - Pushrods are sold each. Depending on your tappets and pushrod tube length the length of the lower adjuster may not be ideal for ease of adjustment.
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Zipper’s Cut-To-Fit Pushrods (sold each)
$0.00
Need custom length pushrods? These solid pushrods are made from heat treated .065” wall seamless 3/8” chrome moly tubing and are supplied with full radius “Mae West” tips (drilled for oil flow) for use with the highest lift cams. They are supplied extra-long with one end unfinished, to be custom fitted by the engine builder. Cut, drill end .250”, ream 17/64”, press in tip. Use with adjustable lifters or customize length for hydraulic lifter pre-load. Sold each.
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Zipper’s Cushion-Drive Chain Conversion Kits for 2009 and later Touring Models
$0.00
We’ve taken the hassle of converting your late model belt driven H-D® to chain drive. Whether you’re interested in a different final drive ratio or added driveline strength this kits will make your life easier.
Zipper's NEW cushion-drive chain conversion kit for 2009-up Touring models is for high output engines, with a modular design for strength and easy ratio changes. This kit is supplied with a steel front sprocket, a 7075-T6 aerospace aluminum rear sprocket or black steel rear sprocket, and O-ring chain (available in standard metallic, gold, or black) or Drag Race chain. Our cushion-drive chain conversion kit is equipped with a chrome-moly axle and severe-duty slider-style chain adjusters, eliminating the cam adjusters. Conveniently, this system bolts-on and does not require modifications to the swing-arm. Contact us today for any additional inquires about this kit.
https://youtu.be/r7M1TEXEDAU
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Zipper’s Chain Conversion Kits for Touring Models
$0.00
We’ve taken the hassle of converting your late model belt driven H-D® to chain drive. Whether you’re interested in a different final drive ratio, added driveline strength or more clearance for a wider tire, these kits will make your life easier. Kits are available with durable, high wearing RK Pro O-Ring chains (best for street use) or RK's brutally strong, non-o-ring DR (Drag Race) chain.
*** Due to supply problems, 1985 - 1999 and 2007 and 2008 kits are only available with chrome steel or silver steel rear sprockets!!! The largest rear sprocket available is a 51 tooth***. 2000-2006 kits are only available with chrome steel or black steel rear sprockets.
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*To purchase item(s) below select the radio button next to item of your choice, then click add to cart*.
Zipper’s Chain Conversion Kits for Dyna® Models
$0.00
We’ve taken the hassle of converting your late model belt driven H-D® to chain drive. Whether you’re interested in a different final drive ratio, added driveline strength or more clearance for a wider tire, these kits will make your life easier. Kits are available with durable, high wearing RK Pro O-Ring chains (best for street use) or RK's brutally strong, non-o-ring DR (Drag Race) chain.
*** Due to supply problems, 1985 - 1999 and 2006 and later kits are only available with chrome steel or silver steel rear sprockets!!! The largest rear sprocket available is a 51 tooth***. 2000-2005 kits are only available with chrome steel or black steel rear sprockets.
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*To purchase item(s) below select the radio button next to item of your choice, then click add to cart*.
Zipper’s Chain Conversion Kits for Softail® Models
$0.00
We’ve taken the hassle of converting your late model belt driven H-D® to chain drive. Whether you’re interested in a different final drive ratio, added driveline strength or more clearance for a wider tire, these kits will make your life easier. Kits are available with durable, high wearing RK Pro O-Ring chains (best for street use) or RK's brutally strong, non-o-ring DR (Drag Race) chain.
*** Due to supply problems, kits are only available with chrome steel or silver steel rear sprockets in 46, 47, 48, 49 and 51 tooth!!! ***
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*To purchase item(s) below select the radio button next to item of your choice, then click add to cart*.
Zipper’s Chain Conversion Kits for FXR® Models
$0.00
We’ve taken the hassle of converting your late model belt driven H-D® to chain drive. Whether you’re interested in a different final drive ratio, added driveline strength or more clearance for a wider tire, these kits will make your life easier. Kits are available with durable, high wearing RK Pro O-Ring chains (best for street use) or RK's brutally strong, non-o-ring DR (Drag Race) chain.
*** Due to supply problems, kits are only available with chrome steel or silver steel rear sprockets in 46, 47, 48, 49 and 51 tooth!!! ***
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5 Speed Big Twin Chain Conversion Transmision Sprockets
$0.00
These conversion sprockets will allow you to convert your Big Twin to chain drive and gives you room to run a wider tire. Ideal for racers wanting the extra strength of a chain, clearance to run different tires and simplified gear changes. .750” offset sprockets are a direct bolt-on for 1995-up 5-speed models; 1985-1994 models require a seal and spacer kit listed below (#850-344).
5 SPEED - Choose standard offset of .750”, or extra wide offset of 1.060” or 1.310" (custom fabrication required for .810” and 1.060”).
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*Please select the radio button next to item of your choice from the options below, then click add to cart.*
6 Speed Big Twin Chain Conversion Transmision Sprockets
$0.00
These conversion sprockets will allow you to convert your Big Twin to chain drive and gives you room to run a wider tire. Ideal for racers wanting the extra strength of a chain, clearance to run different tires and simplified gear changes.
6 SPEED - Choose standard offset of .500”, or extra wide offset of .750” (custom fabrication required for .750”).
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Air Filter Covers for S&S Air Filter Kits
$0.00
Add the famous classic teardrop air cleaner assembly to your ride - available separately from the S&S Air Filter Kits for repairs or maintenance. Choose either ventilated chrome or standard chrome cover.
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Andrews Twin Cam® Pushrods
$0.00
Andrews adjustable pushrods utilize 7/16" diameter tubing. Choose between lightweight aluminum or rigid chrome-moly steel.
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AV&V 7mm Lock & Retainer Set
$0.00
Replace your factory powdered-metal retainers and stamped keys with these highly durable, high quality chrome moly forged spring retainers and steel keys. Don’t risk a catastrophic failure with substandard stock parts in your performance application!
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AV&V Black Tulip Extreme Duty EV Big Twin Valves
$0.00
These superb valves are one-piece forged from a racing grade stainless steel alloy with a hard black finish and a bearing quality hardened tip at the end of the stem to prevent premature wear with high-lift applications.
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AV&V Black Tulip Extreme Duty Twin Cam® Valves
$0.00
These superb valves are one-piece forged from a racing grade stainless steel alloy with a hard black finish and a bearing quality hardened tip at the end of the stem to prevent premature wear with high-lift applications.
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*Please select the radio button next to item of your choice from the options below, then click add to cart*
AV&V EV & TC Beehive Valve Spring Kits
$0.00
From our northern friends in Canada come these excellent quality valve spring kits, utilizing ultra clean Kobe high silicon spring wire and precision-machined collars and steel keepers for improved valve control and long term durability. Development testing has shown AV&V’s retaining components to be over 50% stronger in destructive tests than stock.
***Please select the radio button next to item of your choice from the options below, then click add to cart***
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AV&V EV & TC Dual Coil Valve Spring Kits
$0.00
From our northern friends in Canada come these excellent quality valve spring kits, utilizing ultra clean Kobe high silicon spring wire and precision-machined collars and steel keepers for improved valve control and long term durability.
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AV&V Manganese Bronze Valve Guides & Reamers
$0.00
AV&V’s CNC-machined valve guides are made from Manganese bronze alloy which allows tighter clearances for improved heat dissipation, quiet operation and long life.
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AV&V Viton Valve Seals
$0.00
AV&V’s valve seals are made from a special Viton compound that can resist higher temperatures than standard Viton seals. Manufactured to fit tighter on the guide – stays put! For this reason we recommend AV&V’s Valve Seal Driver tools for installation.
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Baisley Pro-Street EV Big Twin Valves
$0.00
When it comes to high performance valves, Pro-Street out shines the competition. One-piece stainless impregnated by a special German process (.002 deep and .0002 surface build-up) to improve wear performance in cast iron or nickel-bronze guides.
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Baisley Pro-Street Roller Rockers
$0.00
Baisley Hi-Performance offers a roller tip rocker arm conversion for Harley® engines that dramatically reduces valve and guide wear. Baisley’s modifies the stock rocker arms by adding the roller tip to it. These modifications are performed to the original equipment rocker arms, which you would supply to us. Baisley’s can also change the rocker ratio and correct the rocker arm geometry for high lift applications (valve length modification and spacer plates required; call for specifics).
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S&S Forged Roller Rocker Arms
$0.00
S&S roller rocker arms are forged from 4140 steel, heat treated and shot-peened for additional strength and protection from long-term fatigue. These rocker arms ride on 3/4” wide bushings (stock is 1/2”), and feature a modified lubrication system for unrestricted roller oiling. Because the bushings are wider, we recommend new rocker shafts are used during installation if original shafts show wear in the bushing area. Available for Twin Cam® and EV engines in stock 1.62:1 or higher lift 1.725:1 ratio (modifications required), and Shovel engines in 1.5:1 ratio.
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Standard Rocker Arms
$0.00
Stock replacement forged rocker arms for Twin Cam® and Evolution® engines. Made in USA.
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Belt Drive Transmission Pulleys for 1985-2006 5-Speed Big Twins
$0.00
These transmission belt pulleys allow you to change your final drive ratio for faster acceleration or lower RPM cruising on the highway. Installation notes - Changing the final drive ratio will affect speedometer reading; ECM adjustment or a Speedometer Calibration Module may be required to correct reading. Generally speaking, a 1-tooth change can be performed without a belt length change; more than 1 tooth may require changing belt length. Rear axle position adjustment required for each pulley tooth change is +/-.125" (3.2mm), while rear axle position adjustment required for each belt tooth change is +/-.280" (7.1mm). Check axle travel and availability of belts before ordering!
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Belt Drive Transmission Pulleys for 2007-Up 6-Speed Big Twins
$0.00
These transmission belt pulleys allow you to change your final drive ratio for faster acceleration or lower RPM cruising on the highway. Installation notes - Changing the final drive ratio will affect speedometer reading; ECM adjustment or a Speedometer Calibration Module may be required to correct reading. Generally speaking, a 1-tooth change can be performed without a belt length change; more than 1 tooth may require changing belt length. Rear axle position adjustment required for each pulley tooth change is +/-.125" (3.2mm), while rear axle position adjustment required for each belt tooth change is +/-.280" (7.1mm). Check axle travel and availability of belts before ordering!
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Zipper’s 5 Speed Big Twin Support Door (Bisagno Style)
$0.00
Zipper’s manufactures the strongest transmission door for Big Twin 5 speed transmissions. This double row ball bearing design provides more shaft support than any other product on the market!
This door is the ideal choice for any high performance or hard core racing application.
These doors will give you:
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- Improved shifting
- Less frictional losses
- Added Support for durability in large power output applications
Feuling® HP+ Lifters
$0.00
Feuling’s® HP+ lifters are designed for use in high lift, high RPM applications. Featuring optimized valving that improves oil flow to the top end while retaining true hydraulic operation, these lifters run quiet and are recommended for use with stock or Feuling’s® Super Pump oil pump. Drop-in performance replacements for the stock lifters. Sold in sets of 4.
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Cometic® ‘AFM’ Primary Gaskets for Evolution® Big Twin Engines
$0.00
AFM (Aluminum Foamet Material) Gaskets have a chemically blown, compounded nitrile synthetic foam-like rubber bonded to an aluminum core. AFM material does not require gasket sealers or silicone bead.
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Cometic® ‘AFM’ Primary Gaskets for Twin Cam® Engines
$0.00
AFM (Aluminum Foamet Material) Gaskets have a chemically blown, compounded nitrile synthetic foam-like rubber bonded to an aluminum core. AFM material does not require gasket sealers or silicone bead.
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Cometic® Copper Base Gaskets
$0.00
We stock these copper base gaskets in 4 different thicknesses, allowing the builder to adjust cylinder deck height for precise piston-to-head squish area. Simplifies set-up when building performance engines.
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