Hammer Performance - for All Your Harley Davidson XL Sportster and Big Twin Performance Needs
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Harley Davidson and Buell Performance Photo Gallery

Pictures of Harley Davidson and Buell Performance Cylinder Heads

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What's New?

Click Here for an index of recent web site updates


HAMMER Raises the Bar Again with the World's First BOLT-ON 1275 KIT for Sportsters and Buells - From $699.95
Closeout 1250 Kits Available From $495

Black Highlighted 2004-Present 1275 Kit for Harley Davidson XL Sportster or Buell
Click on the Image Above for a Slide Show of 1275 Available Colors and Fin Styles

120,000psi tensile strength steel liners are what makes it possible. They provide the strength needed to support the big bore and provide superb ring seal, enabling new levels of bolt-on performance never before possible on the XL platform!

Click Here for all the details on these amazing kits.
Order online or Contact Us for more details today!


with a Hammer Performance bolt-on 1275 kit!

Recent Web Site Updates:

6/22/18: New Tech Tip Video - Installing Cylinders and Pistons
6/15/18: New Tech Tip Video - Bronze Oil Pump Gear
6/8/18: New Tech Tip Videos Page Added
6/8/18: New Shop Videos Page Added
3/4/18: Cone Engineering Pipe Test Result Posted
2/11/18: Arlen Ness F-Bomb Pipe Test Result Posted
2/10/18: Two Brothers Comp-S 2014+ Pipe Test Result Posted
2/10/18: Bassani Road Rage 3 Pipe Test Result Posted
11/18/17: Larry Westerfield Dyno Sheet Posted
5/12/17: Nick Clark Dyno Sheet Posted
4/13/17: Two New Crew Members!
2/27/17: 883 Conversions Article Updated for 1275 Kit
2/12/17: Announcing the New HAMMER Bolt-On 1275 Kit!
1/30/17: Closeout Pricing on HAMMER 1250 Kits!
11/7/16: Five-Axis CNC Head Porting at HAMMER PERFORMANCE
8/28/16: Mat Hormell Dyno Sheet Posted
7/11/16: Dwayne Buzzell Dyno Sheet Posted
7/7/16: Charles Osgood Dyno Sheet Posted
7/7/16: V&H Competition Series Pipe Test Result Posted
6/28/16: Tim Hopper Dyno Sheet Posted
6/14/16: Richard Cooper Dyno Sheet Posted
6/13/16: Charlie's HD Dyno Sheet Posted
5/3/16: Richard Rivera Dyno Sheet Posted
4/24/16: 120+hp 883-1275 Conversion Package Announced!
2/29/16: Tracey Harrison-Hill Dyno Sheet Posted
2/29/16: John Plaster Dyno Sheet Posted
2/23/16: Cobra PowerPro HP Tested
2/23/16: Rush Slip-Ons Tested
2/8/16: Supertrapp 2 into 2 Tested
12/13/15: New Tech Article: Hopping Up an XL1200 (preliminary)
11/2/15: Joseph Fucci Dyno Sheet Posted
11/2/15: Kelly Carter Dyno Sheet Posted
11/2/15: John Woeck Dyno Sheet Posted
9/7/15: New Tech Article: XL Throttle Body Dyno Results
9/6/15: Carbon Fiber Air Cleaner Covers Available Again
7/21/15: Alex Hurt Dyno Sheet Posted
7/3/15: XL Drivetrain Page Added
6/27/15: New Section Added to the Engine Kit Installation Instructions
6/21/15: Rob Bullard Dyno Sheet Posted
6/16/15: Two New Pictures Added to the Photo Gallery
6/16/15: CNC Machined Fin Edges Available on All 1250 Kits
6/13/15: Five New Pictures Added to the Photo Gallery
6/13/15: Hideki Kusunoki Dyno Sheet Posted
6/13/15: Jim Carli Dyno Sheet Posted
6/10/15: Matt Carpentieri Wins a Wally at Lebanon Valley Dragway
4/24/15: Machined Steel Timing Cup Rotors Now Offered for XL's
4/22/15: Matt Page Dyno Sheet Posted
4/17/15: 32 New Photo Gallery Submissions Added
4/6/15: New XB/XR Crankshaft Upgrade Service for 91-03 XL
3/31/15: XL Ignition Page Added
3/26/15: XL Lubrication Products Added
3/26/15: XL Gaskets Now Available Online
2/20/15: Sample Package Estimates added to Conversion Tech Article
2/16/15: John Plaster Dyno Sheet Posted
2/8/15: New SLEDGE Package Dyno Results for the Shop Mule
1/18/15: Two Brothers Comp-S Tested
1/12/15: Joe Schaffner Dyno Sheet Posted
12/18/14: Meet the HAMMER PERFORMANCE Crew!
12/13/14: Mort Gelberd Dyno Sheet Posted
11/30/14: Brian Kolis Dyno Sheet Posted
11/30/14: Stew Cohn Dyno Sheet Posted
11/6/14: New T-Shirts Available
10/25/14: Chris Bulpitt Dyno Sheet Posted
8/17/14: Blem 1250 Kits Offered on the Garage Sale Page
8/14/14: RSD Tracker Tested
7/26/14: Jonathan Lord Dyno Sheet Posted
7/20/14: Ken Kirby Dyno Sheet Posted
6/16/14: Terry Flynn Dyno Sheet Posted
6/15/14: Aluminum ACR Plugs Now Available
6/13/14: Adam Hunt Dyno Sheet Posted
5/27/14: JackHammer 570 Cams Now Available
5/22/14: Kevin Taggart Dyno Sheet Posted
4/19/14: Ryan Dhabalt Dyno Sheet Posted
4/3/14: Bassani Slip-Ons Tested
3/16/14: Wade Richards Dyno Sheet Posted
3/9/14: Cycle Shack Slash Slip-Ons Tested
3/9/14: Stock 2007 Exhaust Tested
3/6/14: John Plaster Dyno Sheet Posted
3/3/14: The Shop Mule Gets Crushed!
3/3/14: Jay Sutter Dyno Sheet Posted
2/27/14: Additional Information added to the Contact Us page
2/18/14: New Video from RedLine Racing/Madnss
1/19/14: Gaterman Lifters Now Available
12/3/13: RSD Slant 2:1 Exhaust Tested
12/3/13: Art Hernon Dyno Sheet Posted
11/29/13: Seven New Pics Added to the Photo Gallery
11/29/13: New FAQ Section in 883 Conversions Tech Article
11/29/13: John Helfer Dyno Sheet Posted
10/21/13: Terry Flynn Dyno Sheet Posted
10/21/13: Harley Matson Dyno Sheet Posted
9/24/13: Install Instructions for CRUSH & SLEDGE Air Hammers Posted
9/24/13: Install Instructions for IMPACT Air Hammers Posted
9/23/13: New Air Hammer Models Offered
8/20/13: New Tech Article: Dyno Testing XL Exhaust Systems
8/16/13: Fourteen New Head Shots
8/14/13: Dave Cremeans Dyno Sheet Posted
8/5/13: Richard Taylor pic added to the Photo Gallery
8/3/13: Richard Taylor Dyno Sheet Posted
7/27/13: Bob Thompson Dyno Sheet Posted
7/24/13: Aleksey Rozentuler pic added to the Photo Gallery
7/20/13: Seven New Head Shots
7/17/13: Thunderstorm Heads Discontinued
7/12/13: Slapster pic added to the Photo Gallery
7/11/13: Aleksey Rozentuler Dyno Sheet Posted
6/30/13: Six New Head Shots
6/30/13: Dave Wilhdlm pic added to the Photo Gallery
6/25/13: Tyler Woodard Dyno Sheet Posted
6/24/13: HAMMER Customers dominate XLF Shootout
6/24/13: John Helfer pic added to the Photo Gallery
6/22/13: Updated Dyno Sheet for Mort Gelberd

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All Rights Reserved
All images and other content on this web site are the property of Hammer Performance and are not to be used without written permission.

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