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Zipper's Stage IV ProMax CNC 2.0” Heads Double click on above image to view full picture

Zipper's Stage IV ProMax CNC 2.0” Heads

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As low as: $1,359.00

Price as configured: $0.00

Overview

Our High Output 2.0”Twin Cam© heads are designed for larger displacement, 4 inch+ bore engines. Both ports feature more extensive CNC porting and the intake valve seat is changed and valve size is increased to 2.0 inch. The combustion chamber is enlarged to 97cc and un-shrouded for increased intake flow. Stainless steel valves, Step-Lock guides, Viton® seals and high lift valve springs are installed after the seatwork is finished on our Serdi equipment. These heads are also machined for and include manual compression releases (on non-ACR equipped heads). Used on our 4.125" bore Muscle 107”, 117”, 120” and 124” engine kits. This is the finest modified Twin Cam© head you’re likely to find anywhere!

In compliance with ARB emissions laws, this product is not sold or shipped to California.

Price as configured: $0.00

Details

Our High Output 2.0”Twin Cam© heads are designed for larger displacement, 4 inch+ bore engines. Both ports feature more extensive CNC porting and the intake valve seat is changed and valve size is increased to 2.0 inch. The combustion chamber is enlarged to 97cc and un-shrouded for increased intake flow. Stainless steel valves, Step-Lock guides, Viton® seals and high lift valve springs are installed after the seatwork is finished on our Serdi equipment. These heads are also machined for and include compression releases (on non-ACR equipped heads). Used on our 4.125" bore Muscle 107”, 117”, 120” and 124” engine kits. This is the finest modified Twin Cam© head you’re likely to find anywhere!

Components Include:
  • Full CNC Port and Combustion Chamber Machining
  • Ductile Iron Step-Lock Valve Guides
  • Competition Seat Work on Serdi Equipment
  • 2.000” Int, 1.625” Exh Stainless Steel Valves
  • Performance Valve Springs with Moly Collars
  • Moly Valve Collars and Viton Valve Seals
  • .750” Valve Spring Free Travel
  • Manual Compression Releases Installed (if non-ACR heads)
  • 97cc Combustion Chamber (Skim Decked)
  • Completely Assembled, Ready To install

This service requires the heads from your motorcycle. 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.

 

DOCUMENTS & DOWNLOADS

Zipper's Job Order Sheet

 

 

This product is not for sale or use on pollution controlled vehicles.

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Additional Information

Brand Zipper's
Engine Type No
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Year Range No
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