Skip to Main Content
Garage
Garage
Access Saved Bikes
Create an Account or Log In to store your bikes and shop exact-fit parts in a single click.
Wish List
Wishlist
Cart
Cart
Navigation
Menu
 Search
Search
 Phone
Call Us
 Cart
Cart
Log In/Sign Up

Free Shipping Over $39.99

Orders $39.99 or more ship free within the contiguous U.S.

Free Shipping Policy

No Restock Fees

Doesn't fit? Don't love it?

Return any unused item within 30 days for a full refund.

No-Hassle Returns

  1. Obtain an RA number
  2. Package your product
  3. Send it back to us!
Return Policy

Price Match Guarantee

Found it for less?

RevZilla will match any advertised price on new merchandise available through another authorized U.S. dealer.

Submit a Price Match

Elite Service Rating

Our goal is to provide the best possible shopping experience to every enthusiast who visits RevZilla.

See what our customers are saying about us:

Customer Reviews

ZillaCash Rewards

The ZillaCash rewards program is very straightforward - if you have a RevZilla account, you may already be taking advantage of ZillaCash rewards. Review the following guidelines to see how easy it is to maximize your rewards and put your ZillaCash to work for you.

  • Earn and redeem ZillaCash credit automatically with each order - no fine print, no strings attached, and no hoops to jump through to cash in.
  • All you need is a RevZilla account to start earning - Simply log in each time you shop with RevZilla and we’ll take care of the rest, keeping more money in your pocket just for shopping with us.
  • Earn $5 for Each $100 You Spend on eligible products - up to a maximum of $30 ZillaCash per order for orders totaling $600 or more. Any ZillaCash you earn is automatically applied to the next purchase, so you can sit back, enjoy the ride and feel the savings blow through your hair.
Learn More About ZillaCash
Free Shipping Over $39.99No Restock FeesPrice Match GuaranteeElite Customer Service

S&S 128" Big Bore Kit For Harley 114" Milwaukee Eight 2017-2019

Item: P672777
1 Read 1 Review 2 Q&As Write a Review

Upgrade your 114" M8 motor to the largest bore size possible, without required machining of your cases. This is as simple as big power gets, with ever… Read More

$989.96
$1,099.95
Save $109.99 10%
Rebate Available! View Details
Non-Highlighted Fins Fullscreen Zoom
View Images (2)
View Video
This item Ships FREE
Earn $30 in ZillaCash
Guaranteed Low Price
This product is vehicle specific.
Select a bike to ensure fitment.
Looking for a different bike?
Please select a Finish to view availability.
Add To Wish List
Add To Wish List

Similar Categories

View More Videos
Gear Geek
Need Help?
Speak to one of our Gear Geeks:

Product Details

S&S 128" Big Bore Kit For Harley 114" Milwaukee Eight

Upgrade your 114" M8 motor to the largest bore size possible, without required machining of your cases. This is as simple as big power gets, with everything necessary for installation included.

Features:

  • Bolt-on kit, the largest cylinder bore possible for 114" M8 motors without required machining of the crankcases
  • 4.250" bore, 4.500" stroke
  • 11:1 forged pistons with rings, pins and clips
  • All gaskets and hardware required for installation included
  • Wrinkle black finish
  • Made in the USA
Made in the USA
Product Style RevZilla Item # MFR. Product # Availability
Product Style Non-Highlighted Fins RevZilla Item #1591335 MFR. Product #910-0684 AvailabilityIn Stock: Ships within 24 hours
Product Style Highlighted Fins RevZilla Item #1591334 MFR. Product #910-0685 AvailabilityIn Stock: Ships within 24 hours
Please review this product's fitment notes & exceptions prior to purchase: Add to Cart
This product is vehicle specific.
Select a bike to ensure fitment.
Fitment Notes & Exceptions
  • Fits models with 114" Milwaukee Eight motor only
This Product Fits
Harley Davidson
Electra Glide Ultra Limited CVO/SE FLHTKSE 2017, 2018, 2019
Road Glide CVO/SE FLTRXSE 2018, 2019
Softail Breakout 114 FXBRS 2018, 2019
Softail Fat Bob 114 FXFBS 2018, 2019
Softail Fat Boy 114 FLFBS 2018, 2019
Softail FXDR 114 FXDRS 2019
Softail Heritage Classic 114 FLHCS 2018, 2019
Street Glide CVO/SE FLHXSE 2017, 2018, 2019

Shipping

Orders $39.99 and over qualify for our fast free shipping offer. Click Here for FREE Shipping Terms and Conditions.

Please see our International Orders page for orders shipping outside the US.

We show real-time availability on this product page when you select the size/color item you want.  Most items will ship the same business day an order is placed, however if an item requires additional processing time a message will be shown indicating such.

See our full Shipping Policy for further details.

Returns

If your order arrives and it is not right, we will fix it, NO NONSENSE, we promise.

Doesn't fit or just not happy with it? You can return any new, unused and unaltered item within 30 business days of delivery receipt of your item. We will issue a full refund to your original payment method.

See our full Return Policy for all of the pertinent details.

Product Description
Part Numbers
Fitment
Shipping & Returns
1 Customer Reviews
1 4/5
2 Questions & 0 Answers

Related Video

S&S Air, Fuel & Intake for Harley Review

Reviews & Questions

Leave a product review for a chance to win one of our monthly $100 giveaways.
Ask or answer a question to win one of our monthly $100 giveaways.