Zippers Performance


Zipper’s CNC Thunderstorm® Heads for XL® Sportster® and Tube-Frame Buell®

SKU# 2402

Availability: In stock

As low as: $2,269.00

Price as configured: $0.00

Quick Overview

Buell® Thunderstorm® heads are a popular upgrade for ’91-’03 Sportster® engines – and they reach Hurricane status with Zipper’s CNC port work! After the ports receive the full CNC treatment, Step-Lock valve guides are installed and honed for a perfect fit; the seats are machined to accept larger Baisley stainless steel valves (1.840” intake, 1.615” exhaust) on our Serdi head machine. Our Pro-Street valve springs with titanium collars are installed for precise valve control at the high RPM these heads are capable of delivering. Two versions are available; Standard for 3-1/2” bore 1200’s (69cc chamber), and Big Bore for 3-13/16” bore, 88” or 99” XL or Buell engines (73cc chamber). Spring travel is packed for use with up to .575” cams (3-1/2” heads) or .650” cams (3-13/16” heads), and the combustion chamber in each type is CNC machined to match our specialty pistons for these bore sizes. These heads can be ordered with dual plugs as an option. Black finish only.

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Buell® Thunderstorm® heads are a popular upgrade for ’91-’03 Sportster® engines – and they reach Hurricane status with Zipper’s CNC port work! After the ports receive the full CNC treatment, Step-Lock valve guides are installed and honed for a perfect fit; the seats are machined to accept larger Baisley stainless steel valves (1.840” intake, 1.615” exhaust) on our Serdi head machine. Our Pro-Street valve springs with titanium collars are installed for precise valve control at the high RPM these heads are capable of delivering. Two versions are available; Standard for 3-1/2” bore 1200’s (69cc chamber), and Big Bore for 3-13/16” bore, 88” or 99” XL or Buell engines (73cc chamber). Spring travel is packed for use with up to .575” cams (3-1/2” heads) or .650” cams (3-13/16” heads), and the combustion chamber in each type is CNC machined to match our specialty pistons for these bore sizes. These heads can be ordered with dual plugs as an option. Black finish only.

Components Include:
  • New Buell® Thunderstorm® Head Castings
  • Full CNC Port and Combustion Chamber Machining
  • Ductile Iron Step-Lock Valve Guides
  • Competition Seat Work on Serdi Equipment
  • 1.840” Int, 1.615” Exh Stainless Steel Valves
  • Performance Valve Springs with Titanium Collars
  • Completely Assembled, Ready To install
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Zipper’s CNC Thunderstorm® Heads for XL® Sportster® and Tube-Frame Buell® http://www.zippersperformance.com/media/catalog/product/cache/1/image/265x/9df78eab33525d08d6e5fb8d27136e95/5/1/517-574.jpg Buell® Thunderstorm® heads are a popular upgrade for ’91-’03 Sportster® engines – and they reach Hurricane status with Zipper’s CNC port work! After the ports receive the full CNC treatment, Step-Lock valve guides are installed and honed for a perfect fit; the seats are machined to accept larger Baisley stainless steel valves (1.840” intake, 1.615” exhaust) on our Serdi head machine. Our Pro-Street valve springs with titanium collars are installed for precise valve control at the high RPM these heads are capable of delivering. Two versions are available; Standard for 3-1/2” bore 1200’s (69cc chamber), and Big Bore for 3-13/16” bore, 88” or 99” XL or Buell engines (73cc chamber). Spring travel is packed for use with up to .575” cams (3-1/2” heads) or .650” cams (3-13/16” heads), and the combustion chamber in each type is CNC machined to match our specialty pistons for these bore sizes. These heads can be ordered with dual plugs as an option. Black finish only.

Components Include:
  • New Buell® Thunderstorm® Head Castings
  • Full CNC Port and Combustion Chamber Machining
  • Ductile Iron Step-Lock Valve Guides
  • Competition Seat Work on Serdi Equipment
  • 1.840” Int, 1.615” Exh Stainless Steel Valves
  • Performance Valve Springs with Titanium Collars
  • Completely Assembled, Ready To install
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