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Twin Cam®
Zipper’s Premium HighFlow Air Cleaner Kits
$0.00
A nice power increase that’s easy to install! Zipper's Premium MaxFlow Air Cleaner Kits
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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.
Please choose your application below then select the radio button next to the item to purchase, then add to cart
MaxFlow Stage 1 Air Filter Upgrade Kit for Twin Cam® Style Cover
$0.00
Is your bike already equipped with a factory Stage I performance air cleaner? Zipper's MaxFlow Stage I Upgrade Kit takes about 5 minutes to install - the difference is immediately noticeable!
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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.
Manley EV & TC Beehive & Dual-Spring Valve Spring Kits
$0.00
Manley valve spring kits contain proven parts made from the finest materials to ensure reliable, durable performance in a demanding environment.
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MaxFlow Stage 1 Air Filter Upgrade Kit for EVO® Style Cover (Carb)
$0.00
Raise the level another step! Zipper's MaxFlow Stage I Upgrade Kit takes about 5 minutes to install - the difference is immediately noticeable!
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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.
MaxFlow Stage 1 Air Filter Upgrade Kit for EVO® Style Cover (EFI)
$0.00
Is your bike already equipped with a factory Stage I performance air cleaner? Zipper's MaxFlow Stage I Upgrade Kit takes about 5 minutes to install - the difference is immediately noticeable!
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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.
Piston Rings – Specialty Applications
$0.00
These replacement ring sets by Hastings are the same as supplied in every new Harley-Davidson® motorcycle engine. The top ring is a barrel faced, moly filled design from which long life, proper lubrication & scuff free service can be expected. The 2nd ring is reverse torsion type; oil ring is the famous Hastings ‘Flex-Vent’ 3-piece design, which exerts uniform pressure on the cylinder wall while providing 200% more drainage capacity than conventional one-piece oil rings. Sold in sets for 2 pistons.
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Pro-Street 5/16″ Spring Kits For EV & Twin Cam® Engines
$0.00
These spring kits are designed to give proper pressure when used with cams in the .550" - .675” lift range.
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Pro-Wire 700+ Valve Spring Kits For EV & Twin Cam® Engines
$0.00
To make big power, you run an aggressive cam profile with high lift.To maintain control of the valve train, the valve spring needs to provide adequate seat and nose pressure, and be able to last a reasonable life cycle in a sometimes brutal environment. In today’s performance engines, this is one of the most highly stressed components; for this reason, you should only consider the highest quality spring you can buy.
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Red Shift Cams® RS627 for Twin Cam®
$0.00
An aggressive design for modified high output Twin Cam engines. The RS627 cams are designed to be used with modified engines with ported heads, high-flow intake and high compression applications.
Compare TDC lifts to assure you have proper valve to valve with each engine application. Change rocker ratio for additional lift. Minimum pump gas recommended static compression range 10.8-11.5
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- Requires adjustable or cut to fit pushrods
- Available in chain & gear drive for Early and Late model engines
- Chain drive- Use Red Shift Cams® Dual Piston Cam Chain Tensioners (#413-901) for improved cam chest component reliability, maximum throttle response and reduced valve train noise.
- Use 07- Up part number for 2006 FXD engines
- New cam bearings and race tappets required
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.
Red Shift Cams® RS647 for Twin Cam®
$0.00
This cam was designed for the big engine performance enthusiasts who require a wide, usable power curve and strong top end charge with excellent valve control. Good valve train dynamics for long life while providing power for severe duty use. Compliments high flow heads, intake and exhaust.
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- Requires adjustable or cut to fit pushrods
- Available in chain & gear drive for Early and Late model engines
- Chain drive- Use Red Shift Cams® Dual Piston Cam Chain Tensioners (#413-901) for improved cam chest component reliability, maximum throttle response and reduced valve train noise.
- Use 07- Up part number for 2006 FXD engines
- New cam bearings and Race tappets required.
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.Please choose your application below then select the radio button next to the item to purchase, then add to cart
Red Shift Cams® RS657 for Twin Cam®
$0.00
The RS657 is one of Zipper’s most Popular big lift grinds that dramatically improves torque over competitors cams while sustaining excellent peak power. This cam is widely used in many performance engines.
This cam is so popular that it is standard equipment in select Zipper’s Performance Muscle Kits and is everything you expect from Red Shift Cams® – broad power, great performance with excellent valve train dynamics-control.
Heavy duty Valve Springs are required, yet the RS657 cams can be used as a bolt-in on H-D 120R engines for a dramatic increase in power.
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- Requires adjustable or cut to fit pushrods
- Available in chain & gear drive for Early and Late model engines
- Chain drive- Use Red Shift Cams® Dual Piston Cam Chain Tensioners (#413-901) for improved cam chest component reliability, maximum throttle response and reduced valve train noise.
- Use 07- Up part number for 2006 FXD engines
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.Please choose your application below then select the radio button next to the item to purchase, then add to cart
Red Shift Cams® RS687 for Twin Cam®
$0.00
This grind was developed for special application high output engines with significant compression and desire for a wider aggressive power curve from 3500 to 7000+ RPM.
Compare this cam with RS 727 to review TDC lift if your heads have tight valve to valve clearance. The RS687 cams requires professional set up including yet not limited to
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- special valve springs
- Spring spacing-shimming
- racing tappets
- stiff custom pushrods
- Upgraded oil system
- Requires custom adjustable or cut to fit pushrods
- Available in chain & gear drive for Early and Late model engines
- Chain drive- Use Red Shift Cams® Dual Piston Cam Chain Tensioners (#413-901) for improved cam chest component reliability, maximum throttle response and reduced valve train noise.
- Use 07- Up part number for 2006 FXD engines
- New cam bearings and Race Only tappets required.
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.Please choose your application below then select the radio button next to the item to purchase, then add to cart
Red Shift Cams® RS727 for Twin Cam®
$0.00
The RS727 is a racer’s favorite. This cam was originally intended for drag racing, yet widely used in LSR, Bagger Racing and other special high performance applications.
This grind was developed for special application high output engines with significant compression and wide aggressive power curve staring at 3800 to 7000+ RPM.
This cam yields .830 lift with 1.85 rocker ratios
RS727 cams require professional set up including yet not limited to
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- Special valve springs
- Spring spacing-shimming
- Proper valve to piston clearance
- Racing tappets
- Stiff custom pushrods
- Upgraded oil system
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.*Please select the radio button next to item of your choice from the options below, then click add to cart*
Rocker Arm Shims
$0.00
If you have excessive rocker arm end play you can use these shims to reduce the end play in any rocker with excessive play. Shims must be installed on the non-thrust side of the arm (left side on intake, right side on exhaust).
Be sure not to make the end play too tight as you can damage the shims. We suggest min end play @ .010 when using shims.
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Rocker Box Spacer Plates
$0.00
Machined aluminum rocker box spacer plates, used to correct rocker arm placement when using increased ratio and/or modified geometry rocker arms. May require valve stem length modification. 3/16” thick.
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S&S 3.927” Bore Pistons for Twin Cam® Engines
$0.00
Flat top pistons increase displacement in ’99-’06 88” Twin Cam® engines to 97”; from 96” to 106” in ’07-up engines. Special head gaskets and cylinder machining 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.
S&S 4-1/8” Bore Pistons for 124” EV/TC Engines
$0.00
Flat top pistons for S&S® 124” SSW+ engines.
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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.
*Please select the radio button next to item of your choice from the options below, then click add to cart*
S&S Air Filter Kits for Stock, CV and E/G Carb Models
$0.00
S&S air cleaners for stock carb and S&S E/G carbs--add the famous classic teardrop air cleaner assembly to your ride. Replacement back plates, covers and filter elements for S&S applications available separately for repairs or maintenance.
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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.
Please choose your application below then select the radio button next to the item to purchase, then add to cart
S&S Crankshafts for Twin Cam® Engines
$0.00
Want the strongest foundation for your Twin Cam® engine? Let us supply you with a new S&S® crankshaft assembly.
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S&S® Base Gaskets
$0.00
S&S® Base Gaskets - Micropore cylinder base gaskets specific to S&S® engines, sold each.
Zipper's Performance stocks most all gaskets, seals and o-rings individually. Contact Us with your specific needs!
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S&S® Complete Engine Gasket Kits
$0.00
S&S® Complete Engine Gasket Kits are complete overhaul gasket sets for S&S® engines. Due to engine options, kits may include gaskets not required in some applications.
Zipper's Performance stocks most all gaskets, seals and o-rings individually. Contact Us with your specific needs!
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S&S® Twin Cam® ‘A’ Style Engine Cases
$0.00
S&S® Twin Cam® ‘A’ style (non-counterbalanced) engine cases are available for the builder who wants to replace a worn out set or use as a rock-solid foundation for a large displacement engine.
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S&S® Head Gaskets
$0.00
Cylinder head gaskets specific to S&S® engines, one-piece style unless otherwise noted, sold each.
Zipper's Performance stocks most all gaskets, seals and o-rings individually. Contact Us with your specific needs!
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S&S® Rocker Box Gasket Sets
$0.00
S&S® Rocker Box Gasket Sets are a full set of rocker box gaskets for a pair of S&S®-brand rocker boxes. Two styles of rocker boxes are manufactured by S&S® for EV & TC engines, original billet and newer die-cast. These gasket kits do not interchange. The easiest way to identify which one you have is by the rocker cover lid formed o-ring. The die-cast has a flat rubber flapper valve built into the breather window of that gasket; the billet style does not.
Zipper's Performance stocks most all gaskets, seals and o-rings individually. Contact Us with your specific needs!
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#517-751 ZIPPERS EV/TC STG I WORKHORSE HEAD SERVICE
$739.00
These heads receive our Stage I Performance Valve Job, 1.850” O.S. Valves, new guides and 7mm conical springs. The head gasket surface will be skim decked to assure a true/flat sealing surface. This is a high quality upgrade for a budget build! Combustion chambers are stock 78 to 83 cc.
Processing time
Once the cores arrive at Zipper’s they are unboxed, and inspected for shipping damage. Then we review your job order sheet and other related documentation. Job sheets that have not been finalized before your cores arrived will take additional time to sort thru before the job is put into production. Once finalized, the cores will be disassembled, serialized then move into production. Turn around (Process time) varies depending on the time of the season and how long it takes to get your job sheet finalized. Because of the dedicated skilled labor at Zippers and the vast amount of capital equipment we get the work completed with the highest standard of quality with one of the best turnaround time in the industry.
Work is performed on your supplied head cores.
For our standard production heads Shop Time is approximately 15 business days (during peak season allow for additional time). The below options will require additional time to process:
Add to cart
-
- Custom Modifications
- Custom Finishes
- Require Thermal coatings
- Needing Additional Repairs
- Or other Non-Standard Work
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, Please fill out a Build Sheet/Job Order Sheet prior to completing an order on the website. Click here for Zipper's Build Sheet/Job Order Sheet
Zipper’s Stage 1.8 CNC Twin Cam® Heads
$0.00
The Stage 1.8 is a fully CNC Ported head designed for 95, 98, 103, or 107 engines. The 1.850” O.S. Valves, new guides and 7mm conical springs. The application allows use with OE piston with shallow valve pockets or engine builder looking for little extra low end response. The head gasket surface will be decked to assure a true/flat sealing surface. Combustion chamber volume is approximately 85-86.5 cc.
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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, Please fill out a Build Sheet/Job Order Sheet prior to completing an order on the website. Click here for Zipper's Build Sheet/Job Order Sheet
Zipper’s Stage II CNC Twin Cam® SportMax Heads
$0.00
Our Stage II CNC heads employ special high velocity ports developed specifically for riders in search of early torque with broad power. With ports designed for high-velocity airflow, matching these heads with the proper camshaft and exhaust produces amazing power. Perfect for riders of heavier machines who want great acceleration just by turning the throttle - no rowing of the gearbox and high RPM needed!
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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, Please fill out a Build Sheet/Job Order Sheet prior to completing an order on the website. Click here for Zipper's Build Sheet/Job Order Sheet
Zipper’s Stage 2.5 CNC for CVO Twin Cooled Heads
$1,249.00
CNC ported designed specifically to unleash great power in
engines that require flat top pistons from 110-117 CI. New valves, guides, springs
and seals are installed and the heads are decked to assure a true/flat sealing
surface. This head is widely used in SE CVO 117 kits. Combustion chambers are 95
cc.
*Available for Twin Cooled Models
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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, Please fill out a Job Order Sheet prior to completing an order on the website. Click here for Zipper's Job Order Sheet
Zipper’s Stage III CNC Ported Heads ThunderSport
$0.00
Our Stage III ThunderSport heads are the perfect choice for 3.875 - 3.937” bore Twin Cam® engines with all the highs - high compression, high flow throttle body, high flow exhaust and high output at all RPM’s! Our original design has been fully refined to fulfill the airflow needs of the highly modified Twin Cam® engine with displacement ranging from 95 to 107 cubic inches.
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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, Please fill out a Build Sheet/Job Order Sheet prior to completing an order on the website. Click here for Zipper's Build Sheet/Job Order Sheet*To purchase item(s) below select the radio button next to item of your choice, then click add to cart*.
Zipper’s Stage III CNC Heads for CVO 110 & 120R/ST Engines
$0.00
Zipper’s has developed these Stage III heads specifically for CVO 110 and 120R/ST engines to increase port velocity and the result is a huge power increase for these thirsty engines! This unique design delivers an awesome experience, with broad power for all types of riding. Installed on a 110 with Red Shift 657 cams, these heads put over 129 HP through the rear tire with a conservative 10.3:1 compression! Other high output applications are also available.
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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, Please fill out a Build Sheet/Job Order Sheet prior to completing an order on the website. Click here for Zipper's Build Sheet/Job Order Sheet
Zipper’s Stage 3.5 CNC 99-05 TC w/MCR
$1,549.00The Zipper's Performance Stage 3.5 heads with Manual Compression Releases have a special high flow port design that is one of the largest we can machine into an O.E castings. Special O.S. 2.00” valves, Step Lock Guides, special valve seat machining, 5/16” dual spring for lift up to .675”. These are maximum output heads and are a good option Vs purchasing CVO castings with the added expense of porting. Combustion chambers are 92 cc.
*Not available for Twin Cooled Models
Processing time Once the cores arrive at Zipper’s they are unboxed, and inspected for shipping damage. Then we review your job order sheet and other related documentation. Job sheets that have not been finalized before your cores arrived will take additional time to sort thru before the job is put into production. Once finalized, the cores will be disassembled, serialized then move into production. Turn around (Process time) varies depending on the time of the season and how long it takes to get your job sheet finalized. Because of the dedicated skilled labor at Zippers and the vast amount of capital equipment we get the work completed with the highest standard of quality with one of the best turnaround time in the industry. Work is performed on your supplied head cores. For our standard production heads Shop Time is approximately 15 business days (during peak season allow for additional time). The below options will require additional time to process:-
- Custom Modifications
- Custom Finishes
- Require Thermal coatings
- Needing Additional Repairs
- Or other Non-Standard Work
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 Stage 3.5 CNC for 06+ TC w/MCR
$1,549.00
The Zipper's Performance Stage 3.5 heads with Manual Compression Releases have a special high flow port design that is one of the largest we can machine into an O.E castings. Special O.S. 2.00” valves, Step Lock Guides, special valve seat machining, 5/16” dual spring for lift up to .675”. These are maximum output heads and are a good option Vs purchasing CVO castings with the added expense of porting. Combustion chambers are 92 cc.
*Not available for Twin Cooled Models
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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, Please fill out a Build Sheet/Job Order Sheet prior to completing an order on the website. Click here for Zipper's Build Sheet/Job Order Sheet
Zipper’s Stage 3.5 CNC for 06+ TC w/ACR
$1,425.00
The Zipper's Performance Stage 3.5 heads with Automatic Compression Releases have a special high flow port design that is one of the largest we can machine into an O.E castings. Special O.S. 2.00” valves, Step Lock Guides, special valve seat machining, 5/16” dual spring for lift up to .675”. These are maximum output heads and are a good option Vs purchasing CVO castings with the added expense of porting. Combustion chambers are 92 cc.
*Not available for Twin Cooled Models
Add to cart
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, Please fill out a Build Sheet/Job Order Sheet prior to completing an order on the website. Click here for Zipper's Build Sheet/Job Order Sheet
Zipper’s Stage 3.5 CNC for CVO/MVA Heads
$1,919.00
This cylinder head is designed for racing using CVO or MVA
castings and high lift cams with larger TDC numbers to provide extra flow to meet
the power needs of high output and a race applications. Contact our engine
experts at Zippers to discuss your specific needs.
*Not Available for Twin Cooled Heads
*To ensure you enjoy a premium experience, Please fill out a Build Sheet/Job Order Sheet prior to completing an order on the website.
Click here for Zipper's Build Sheet/Job Order Sheet
Add to cart
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 Stage 4 CNC for 06+ TC w/ACR
$1,485.00
The largest port we can machine into these O.E castings is what
you get with Stage 4. O.S. 2.00” Valves, Step Lock Guides, special valve seats,
5/16” valve springs allow up to .750” of cam lift. Max flow design for big
displacement engines with large airflow demand. The larger valves are completely
un-shrouded in the fully machined chambers. Combustion Chambers are 98 cc.
*Now Available for Twin Cooled models.
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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, Please fill out a Build Sheet/Job Order Sheet prior to completing an order on the website. Click here for Zipper's Build Sheet/Job Order Sheet
Terry Components Battery Cables
$0.00
These are the finest battery cables we’ve ever used. Made from 1650 strands of 44-gauge super flexible tinned copper wire, and covered with an equally flexible black silicone jacket. Designed to deliver all available amperage from your battery to the starter without voltage drop. Ends are finished with 99.9% pure electrolytic copper lugs, securely fastened for maximum durability and conductivity. Rated at 600 volts!
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