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CNC Porting Services for Harley Heads Double click on above image to view full picture

CNC Porting Services for Harley Heads

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Overview

Zipper's pioneered CNC-porting in Twin Cam® Harley heads in 1999 with the first TC Performance Kit. With 19 years of experience we have expanded our line of CNC ported and combustion chamber designs to cover most popular Screaming Eagle and aftermarket engine configurations for Harley engines.

Zipper's CNC Ported Twin Cam Harley Cylinder Heads
• Stage 1.8 CNC port fitted for 1.850 intake to use on engines with stock O.E. pistons with shallow valve pockets- 85cc
• Stage 2.0 High velocity ports with larger 7mm 1.900 valves designed for 103, 107 CI engines with aftermarket flat top pistons 85 cc
• Stage 3.0 Larger ports/ increased air flow, 1.900 full CNC chambers, ideal for higher output engines with dome pistons and larger Throttle Bodies, chambers 91cc
• Stage 3.5 Special high flow oversize ports machined into an O.E castings. Special O.S. seats, 2.00 Intake valves with 92 cc chamber
• Stage 4.0 The largest port we can machine into an O.E castings. 2.00 Intake valves for max flow with fully un-shrouded 98 cc chambers

CVO-MVA Castings
• Stage 2.5- Fully CNC ported designed specifically for engines using the Screaming Eagle 117 kit with flat top pistons. Head Uses CVO standard valve sizes to retain a 95cc chamber
• Stage 3.0- Currently our maximum flow head CVO castings, Excellent port design w/oversize intake/exhaust valves, ideal for max output engines-101 cc chamber. Minimum valve sizes are 2.100/1.650 or larger

Stated chambers volume is based off full deck, custom decking can be accomplished to reduce chamber volume for specific compression targets.


Click here to complete a Services Inquiry Form, and a Zipper's Representative will be in contact with you.

Details

Zipper's pioneered CNC-porting in Twin Cam® Harley heads in 1999 with the first TC Performance Kit. With 19 years of experience we have expanded our line of CNC ported and combustion chamber designs to cover most popular Screaming Eagle and aftermarket engine configurations for Harley engines.

Zipper's CNC Ported Twin Cam Harley Cylinder Heads
          •    Stage 1.8  CNC port fitted for 1.850 intake to use on engines with stock O.E. pistons with shallow valve pockets- 85cc
          •    Stage 2.0  High velocity ports with larger 7mm 1.900 valves designed for 103, 107 CI engines with aftermarket flat top pistons 85 cc
          •    Stage 3.0  Larger ports/ increased air flow, 1.900 full CNC chambers, ideal for higher output engines with dome pistons and larger Throttle Bodies, chambers 91cc
          •    Stage 3.5 Special high flow oversize ports machined into an O.E castings.  Special O.S. seats, 2.00 Intake valves with 92 cc chamber
          •    Stage 4.0 The largest port we can machine into an O.E castings.  2.00 Intake valves for max flow with fully un-shrouded 98 cc chambers

CVO-MVA Castings
          •    Stage 2.5- Fully CNC ported designed specifically for engines using the Screaming Eagle 117 kit with flat top pistons. Head Uses CVO standard valve sizes to retain a 95cc chamber
          •    Stage 3.0- Currently our maximum flow head CVO castings, Excellent port design w/oversize intake/exhaust valves, ideal for max output engines-101 cc chamber.  Minimum valve sizes are 2.100/1.650 or larger

Stated chambers volume is based off full deck, custom decking can be accomplished to reduce chamber volume for specific compression targets.

 

Click here to complete a Services Inquiry Form, and a Zipper's Representative will be in contact with you.

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Customer Reviews

3 Item(s)

Great overall increases in Torque and HP Review by James
Price
Value
Quality
Super job on the Stage II SportMax Headwork.
Increase in Power and Torque when Dyno Tuned of over 10%.
Impressive gain can really be felt. (Posted on 10/19/2015)
Great Work, Great Product, Super Great Service! Review by James
Price
Value
Quality
Talk to these guys, they will not try to sell you something you don't need, and are very good in explaining what to expect.
Highly Reccommend. (Posted on 10/19/2015)
Power Band is Great Review by A.L.
Price
Value
Quality
I would like to thank all of you for how pleased I am with my bike! I put your Thunder Sport III Heads and the ThunderMax® with AutoTune on my 2006 Night Train®. The performance is like night and day! I’m very happy with your products. Thanks so much. The power band is great and the throttle response is spot on. It runs pretty hard! Thanks again! (Posted on 10/19/2015)

3 Item(s)

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