XLXBhorsepower

02/26/2026

When you have to make the race you think outside the box.

A friend got a set of heads with the pushrod holes not machined for his stroke / case combination. We opened the inner ID hole up to .750” thinking we might gain what we needed but no go during mock up.

Instead of welding them up and starting over, will open the holes up .125” and move up to a larger o-ring size.

I machined these adapters that press in the upper tube today to gain the clearance we need. Will shorten the clips at assembly time to adjust the new needed length for proper tension.

02/10/2026

Custom valves I’ve been waiting weeks for and here’s what was received.

Nothing I can’t fix with some machine time in the lathe but more time eaten up that isn’t billable.

Not worth sending back and waiting more weeks- frustrating

02/05/2026

Racer community is a cool group.

A racer is waiting on new wheels and would have missed the first race of the season… another racer allowed me to pull the crank of his cases (due to his race season starting later) allowing us the chance to pull this off.

For the racer in need I am thanking the racer that gave it up today. 🤙🏻🤙🏻🤙🏻

01/05/2026

2000-up XL cases require the pinion race to be clearanced for large lift lobes (or some chose to grind the corner of the cam lobe) This isnt required on the 91-99 cases.

Another safety net modification we always recommend is to pin the race- this ensure’s it can’t ‘walk’ out.

I’ve only seen this twice, One of the racers had this happen to them last year in a 10:30 motor…

12/14/2025

XB9 crank

Anyone have an XB9 crank laying round they won’t be using?

I need 1 to press apart and do some measuring- won’t ever be run so a junk core is all I need.

I can provide a UPS shipping label

If anyone has one they want to sell please shoot me a note with what you want for it.

12/13/2025

Huge shout out & Thank You to Jeff and team @ S&S Cycle, Inc. for turning back on a few part #’s for the Sportster riders / builders.

The flywheel assembles went obsolete some time ago but excited we can now get replacement ‘wheels’ again in 3 strokes. The below part #’s are for wheels only

I was in need of a set of 4 5/16 set to repair a racers bottom end in Oklahoma they arrived today, I’m sure you’ve made his Christmas 🎄

Im sure they will have announcements soon from S&S, with the bare wheels available again we have options for stock 5 speed case builds.

15D Flywheel, Set, 3-13/16" Stroke, 7-7/8" Diameter, S&S® Sprocket Shaft, S&S® Pinion Shaft, S&S® Crankpin, 1986-2003 xl

3D Flywheel, Set, 4-5/16" Stroke, 7-7/8" Diameter, S&S® Sprocket Shaft, S&S® Pinion Shaft, S&S® Crankpin, 1986-2003 xl

17D Flywheel, Set, 4" Stroke, 7-7/8" Diameter, S&S® Sprocket Shaft, S&S® Pinion Shaft, S&S® Crankpin, 1986-2003 xl
Chad Hart

12/10/2025

4.800” S&S NOS unfinished head piston set.

I have 2 sets of 4.800” bore pistons left. These are STD bore, unfinished head dome’s for you to angle cut them to your build.
Neither pistons are notched for cycle to cycles clearance @ BDC- this will have to be done per your stroke / rod length

No rings, pins & clips included

https://www.xlxbhorsepower.com/product-page/4-800-s-s-pro-stock-piston-set-set-1

Thanks
Chad Hart

NOS set of unfinished 4.800 bore S&S Pro Stock pistons (no rings)

11/27/2025

$5 per piston sale!!

4 days only, today thru Sunday

4.600 bore NOS S&S Pro Stock piston
*sold as a novelty item, no pin, clips or rings.

3 dome options to code from

https://www.xlxbhorsepower.com/category/garage-sale

For everyone that bought them earlier this week for $25 each, I will be sending you $20 per piston refund!
Let’s get one of these pistons in every gear heads stocking this season

Happy Thanksgiving!
Chad Hart

11/24/2025

Gen 1 M8 SE manifold: 64 vs 68mm

11/23/2025

Need a stocking stuffer for a Gear Head that’s hard to buy for?

4.600” Pro Stock piston
I have a small qty of 3 different dome shapes
Selling as a novelty item $5 each
No pins, clips or rings included.

Check out the new “Garage Sale” section, items being added daily.

Sold as a novelty itemNOS Pro Stock piston (ea)No pins. Rings or clips

11/19/2025

It’s the off season racers…. this is why heads need to be pulled apart and given a thorough inspection every winter. If nothing is found, button them back up and go into the new season with the peace of mind.

These will get new valves and guides along with springs. These heavy 2.150 intake valves with 160lbs of seat pressure / 390lbs on the nose when assembled by the original shop, it’s the first time I have had these in my hands so they will get repaired and assembled with the proper spring pressure to control such a heavy valve.