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Zippers Stage III ThunderSport CNC 1.900” TC Heads
Unlock your Twin Cam® engine’s full potential with this powerful ThunderSport CNC-ported head! Zipper’s was the first to offer fully CNC-ported factory heads using 5-axis machining centers in the year 2000. After CNC porting and combustion chamber CC matching, these heads have our Step-Lock guides installed and the valve seats machined with our proprietary seat angles on Serdi equipment to accept 1.900” and 1.630” Baisley coated stainless steel valves for increased flow. After the valve job is complete, the head gasket surface is decked for flatness, Viton® seals installed and performance valve springs are packed for up to .600” lift cam (heads can be ordered with different valve springs for higher lift applications). This head has been purpose built for 88” to 95” or 96” to 103” conversions; same head used in our Muscle 95 and 103 kits. Our Exchange Program allows super-quick turnaround and lower cost if desired, or modified heads can be purchased outright. Also available with optional compression releases installed.
COMPONENTS AND SERVICES INCLUDED:
- Full CNC Port & Combustion Chamber Machining
- Ductile Iron Step-Lock Valve Guides
- Competition Seat Work on Serdi Equipment
- 1.900” Int, 1.630” Exh Stainless Steel Valves
- Performance Valve Springs W/Moly Collars
- .650” Valve Spring Free Travel
- 91cc Combustion Chamber (Skim Decked)
- Completely Assembled, Ready To install
- Optional Compression Releases Installed
We keep exchange heads in stock already modified for super quick turnaround. Parts must be in nearly perfect cosmetic condition (box heads individually with lots of newspaper or foam padding!); expect the same from us. Heads that are extremely dirty, stained, etched or have corroded finishes or damaged fins will be processed (10 working days) and returned to you.
Remove heads from engine, wash off oil and ship to Zipper’s as-is. Because improper cleaning methods can actually do more harm than good, we suggest you allow us to properly prepare your parts for modification. Extreme care is taken during our preparation process to preserve component finishes. A small cleaning charge applies to exchange heads. Previously modified heads are not eligible for exchange.
*517-586EX, 517-587EX do not include front head engine mount machining required for 2008-up Touring models; order part numbers 517-688EX, 517-689EX for 2008-up Touring models
**517-586CREX, 517-587CREX do not include front head engine mount machining required for 2008-up Touring models; order part numbers 517-688CREX, 517-689CREX for 2008-up Touring models
Products on this page are not for sale or use on pollution controlled vehicles.
v.08182010
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| Description |
Part Number |
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| EXCHANGE HEADS |
# EXCHANGE HEADS |
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| Exchange Zipper’s ’99-’05 Twin Cam® 1.900” CNC heads, Black Finish |
# 517-588EX |
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| Exchange Zipper’s ’99-’05 Twin Cam® 1.900” CNC heads, Silver Finish |
# 517-589EX |
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| Exchange Zipper’s ’06-up* Twin Cam® 1.900” CNC heads, Black Finish |
# 517-586EX |
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| Exchange Zipper’s ’06-up* Twin Cam® 1.900” CNC heads, Silver Finish |
# 517-587EX |
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| Exchange Zipper’s ’08-up Touring model TC 1.900” CNC heads, Black Finish* |
# 517-688EX |
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| Exchange Zipper’s ’08-up Touring model TC 1.900” CNC heads, Silver Finish* |
# 517-689EX |
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| EXCHANGE HEADS WITH COMPRESSION RELEASES INSTALLED |
# w/COMP RELEASES |
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| Exchange Zipper’s ’99-’05 Twin Cam® 1.900” CNC heads w/Compression Releases, Black Finish |
# 517-588CREX |
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| Exchange Zipper’s ’99-’05 Twin Cam® 1.900” CNC heads w/Compression Releases, Silver Finish |
# 517-589CREX |
|
|
| Exchange Zipper’s ’06-up* Twin Cam® 1.900” CNC heads w/Compression Releases, Black Finish |
# 517-586CREX |
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| Exchange Zipper’s ’06-up* Twin Cam® 1.900” CNC heads w/Compression Releases, Silver Finish
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# 517-587CREW |
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| Exchange Zipper’s ’08-up Touring model TC 1.900” CNC heads w/Compression Releases, Black Finish |
# 517-688CREX |
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| Exchange Zipper’s ’08-up Touring model TC 1.900” CNC heads w/Compression Releases, Silver Finish |
# 517-689CREX |
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6655-A Amberton Drive Elkridge, Md 21075 410-579-2828 - phone 410-579-2835 - fax
Copyright 2000 by Zipper's Cycle, Inc. All rights reserved. No part of this website may be reproduced without permission.
This site is maintained by Zipper's Cycle, Inc. and CBIZ IT
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