V-Twin Cylinder Head Development, Maintenance and Repair
Welcome to XLXBhorsepower, home of the fastest stock (head castings and cases) 76ci/1250 @9.170/141.9mph and 87ci @8.902/139.71mph on a 1/4 mile strip. We are the leading motorcycle machine shop specializing in Harley Davidson head modifications. We take pride in delivering top-quality performance enhancements to our valued clients. Owner and machinist, Chad Hart, is dedicated to researching and developing innovative solutions and the best techniques to maximize power and speed. From CNC and hand porting to custom valve jobs and manifolds, we use the latest technologies to produce the best results.
Unleash Your Best
HOT NEW ITEM
XLXB has developed custom lifter blocks for 91-03 Sportsters! What makes our lifter blocks different you ask? Good question! Our lifter blocks seal with an O-Ring vs the VW seal. This minimizes movement and leaks. Our shorter design also allows for easier pushrod adjustments.
MISSION
To help riders, street and drag racers, determine what they need for their riding style. There are many ways to achieve performance goals. ‘Ported’ heads are not always the way.
​
Street bikes- Focus on where the bike is ridden 90% of the time. Try not to get hung up on the big horsepower number. This is tough but a fully loaded dresser with 2 riders touring the world needs left side torque more than right side horsepower.
​
Race bikes- Sky’s the limit! It all comes down to the rule books and budget. How’s that for honesty.