Mill Cylinder Head Deck for Increased Compression (each) - $45.00
Cut Angled Squish Band (each head) - $60
Machine Head for Dual Spark Plugs (each head) - $75
Machine Head for Compression Release (each head) - $75.00
CC Cylinder Head (each) - $35.00
Blend/Relieve/CC Chamber for Increased Displacement (each) - $90.00
Oversize Valve Conversion with seat change (each valve)- $82.50
Hammer Performance utilizes CNC extensively to ensure accurate, quality machine work
Cylinder Boring and Honing - $100
Trust the experts at HAMMER PERFORMANCE with this critical job!
There's nothing more important to a good running engine than
proper ring seal, and ring seal is all about a straight, round bore
sized perfectly for the piston and with a proper surface finish to
encourage ring seating. Achieving those
things though takes a combination of equipment, knowledge, and experience.
The experts at HAMMER PERFORMANCE have been boring and honing cylinders for
years and have developed and refined a process that gives perfect results
We start this process by cleaning your head
and base gasket surfaces thoroughly. We then clamp each cylinder into
our specially designed fixture with a torque plate and bore it in a
precision CNC Machine (see the video below). Unlike most boring processes, our double sided boring
head ensures a perfectly round bore because the cutters remain evenly
loaded through the entire process. Coolant is constantly sprayed into
the bore to eliminate distortions caused by heat and provide a smooth,
Once the cylinder is bored, it's taken to our precision honing machine for
final sizing and surface finish. The honing process is cooled with a
constant flow of honing oil again to prevent distortions caused by
excess heat. Using precision measuring instruments with a resolution
down to a ten-thousandth of an inch (.0001) we hone the cylinder for a
perfect fit to the piston. Proper clearance gives better ring seal,
longer life, and MORE POWER.
For the ultimate in performance and longevity, pick up a set of
Sledge Hammer Pistons
when you get your cylinders bored and honed. We give a substantial break on the price when you do,
and you get some of the best HD/Buell pistons available today.
If you want the highest quality cylinder
boring and honing service for your Sportster or Buell, matched to the best pistons you can buy, look no farther
than HAMMER PERFORMANCE!
Precision Bore and Hone XL Cylinder: $100 each/$200 pair
Intake Manifold Porting- Only $75
Let Us Port Your Intake Manifold for More Torque and Power
Your great engine kit, head porting, and cams will do nothing for you if your stock intake manifold chokes the air flow into your engine. Let HAMMER PERFORMANCE
remove this bottleneck with our intake manifold porting service. We'll shape and size the inside of your intake manifold for maximum cylinder fill and leave a surface finish
that encourages fuel mixing and atomization. A must for high performance projects.
Competition Intake Manifold Porting Service: $75
Let us build your street or race engine!
High performance engines require
special checks and procedures that dealership techs aren't always
familiar with. Factory engines are engineered to be assembled but performance
engines need a whole lot more attention to detail.
At HAMMER PERFORMANCE, we have the tools, knowledge, and experience to do every
procedure correctly, from truing your flywheel assembly to clearancing
your cam boxes. We'll get every clearance correct from the flywheel end
play to the piston to valve clearance. We know all the tricks to get
everything out of the motor both in terms of power and longevity. Trust
your engine build to HAMMER PERFORMANCE!
XL Engine Building - call to discuss
Cam Cover Cut Down - $95
Lose the fat! Let HAMMER PERFORMANCE cut down your Cam Cover!
For that minimalist look, many Sportster & Buell owners like to trim off the
excess material behind and below their cam box cover. Cutting it by hand
is tedious and error-prone. At HAMMER PERFORMANCE, we've got a fixture
and a CNC program that does a PERFECT job every time. Send us your cover
and we'll send it back professionally machined and ready for final clean
up/polishing and installation.
We offer this service either with or without
the lower left dowel pin hole retained. We recommend keeping this dowel
hole as it provides precise alignment to the cams.
XL Cam Cover Cut Down
With Dowel Hole Retained: $95
With Dowel Hole Removed: $95
Precision Case Boring - $295
Don't trust this critical procedure to just anyone! Let HAMMER PERFORMANCE do it right!
Accurate case boring can make all the difference in the world for long piston life. The bores must be
straight, at a precise 45 degree angle from each other, and aimed squarely at
the crankshaft. HAMMER PERFORMANCE has developed a 4-axis CNC process to
perform this critical task that does a perfect job first time, every
time! This process has been used hundreds of times over the years
and it's proven to result in reliable, powerful engines.
XL Case Boring - Specify Spigot Size - $295
Other Common Shop Services
For Sportsters & Buells
If you don't see what you're looking
for, please give us a call. Chances are we can either do it for you or
send you to someone who can.
Update Tappet Anti-Rotation Pins in 91-99 Engines to 00-up Style - $85
Gap Rings and Assemble Pistons and Rings into Cylinders - $50
Machine 91-99 Cases for 00-03 Flywheel Assembly - $90
Flywheel Assembly and Truing (non-pressed crank)- $250