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Ships within 48 hours · Estimated delivery Jul 27 - Aug 1
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Description
Wiseco Harley 1340 Evo 8.51 CR 3527X Piston KitV Twin performance has been around since some of the earliest days of motorcycle racing and engine modification, and Wiseco has been there since the beginning. Applying over 80 years of experience, Wiseco has fine tuned its V Twin pistons for each specific engine platform to optimize performance and durability. From reliable rebuilds to all out race, Wiseco has the pistons for your V Twin build. Complete Package: Each piston includes a wrist pin,
V-Twin performance has been around since some of the earliest days of motorcycle racing and engine modification, and Wiseco has been there since the beginning. Applying over 80 years of experience, Wiseco has fine-tuned its V-Twin pistons for each specific engine platform to optimize performance and durability. From reliable rebuilds to all-out race, Wiseco has the pistons for your V-Twin build.
- Complete Package: Each piston includes a wrist pin, rings, and circlips, providing everything needed for installation
- Forged Material: Optimizes strength and service life, ensuring durability under high-stress conditions
- Performance-Enhancing Features: Varied across applications to maximize both durability and power
- Improved tensile strength of forged material optimizes strength and service life
- Optimized compression ratio to fit your build and performance goals
- Designed and built specifically for each V-Twin engine platform
- Engineered, forged, and machined in the USA in Mentor, OH
- Wrist pin, rings and circlips included
- 3.528 in. Bore, 8.5:1 CR
This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1994-1998 | Harley-Davidson | FLHR Road King | Base |
| 1998 | Harley-Davidson | FLHRCI Road King Classic | Base |
| 1996-1997 | Harley-Davidson | FLHRI Road King | Base |
| 1987-1993 | Harley-Davidson | FLHS Electra Glide Sport | Base |
| 1988,1995-1998 | Harley-Davidson | FLHT Electra Glide Standard | Base |
| 1984-1998 | Harley-Davidson | FLHTC Electra Glide Classic | Base |
| 1996-1998 | Harley-Davidson | FLHTCI Electra Glide Classic | Base |
| 1989-1997 | Harley-Davidson | FLHTCU Electra Glide Ultra Classic | Base |
| 1995-1998 | Harley-Davidson | FLHTCUI Electra Glide Ultra Classic | Base |
| 1986-1990 | Harley-Davidson | FLST Heritage Softail | Base |
| 1988-1999 | Harley-Davidson | FLSTC Heritage Softail Classic | Base |
| 1991-1996 | Harley-Davidson | FLSTF Fat Boy | Base |
| 1993 | Harley-Davidson | FLSTN Heritage Softail Nostalgia | Base |
| 1994-1996 | Harley-Davidson | FLSTN Heritage Softail Special | Base |
| 1995-1999 | Harley-Davidson | FXD Dyna Super Glide | Base |
| 1992 | Harley-Davidson | FXDB-D Dyna Glide Daytona | Base |
| 1991 | Harley-Davidson | FXDB-S Dyna Glide Sturgis | Base |
| 1993-1999 | Harley-Davidson | FXDL Dyna Low Rider | Base |
| 1994-1999 | Harley-Davidson | FXDS-Conv Dyna Convertible | Base |
| 1993-1999 | Harley-Davidson | FXDWG Dyna Wide Glide | Base |
| 1984-1994 | Harley-Davidson | FXR Super Glide II | Base |
| 1999 | Harley-Davidson | FXR2 | Base |
| 1999 | Harley-Davidson | FXR3 | Base |
| 1985-1987 | Harley-Davidson | FXRC Low Rider Chrome | Base |
| 1986 | Harley-Davidson | FXRD Sport Glide Grand Touring | Base |
| 1984 | Harley-Davidson | FXRDG Disc Glide | Base |
| 1984-1992 | Harley-Davidson | FXRS Low Glide | Base |
| 1990-1993 | Harley-Davidson | FXRS-Conv Low Rider Sport Convertible | Base |
| 1986-1993 | Harley-Davidson | FXRS-SP Low Rider Sport | Base |
| 1984-1992 | Harley-Davidson | FXRT Sport Glide | Base |
| 1984-1999 | Harley-Davidson | FXST Softail Standard | Base |
| 1986-1999 | Harley-Davidson | FXSTC Softail Custom | Base |
| 1988-1999 | Harley-Davidson | FXSTS Springer Softail | Base |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.9 ★★★★★
Based on 17 reviews
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Product Reviews
★★★★★ 4
Rediscoving the Great Qualities of this Pillow (after Originally Rejecting It)
Color: Original White, Size: Queen
I recently 'rediscovered' this pillow... having purchased it a year or so ago, when neck + shoulder issues prevented me from being very happy with *ANY* pillow! Believe me, I tried so many! Back then, after repeatedly adjusting the fill of this COOP queen-size pillow, I ultimately stashed the whole thing in a closet. But now, it has unexpectedly re-entered my life... and I'm finally liking it.
It helps that I've resolved most of the neck + shoulder issues (thanks to a year of PT). Plus. I realized that I had removed way too much fill... leaving about as much support as a pile of gently scrambled eggs. So, now that I'm in much better condition and have added back a lot of fill, I'm finding this pillow quite satisfying... yes, actually good! These days, I wake up each morning with a much happier neck.
I do not. however, use the thick, quilted, zippered outer cover that came with it... as I find that stiffens + firms up the pillow a little too much for my taste. So, on top of the thinner, stretchy, zippered inner cover (also provided with the pillow, to contain the fill,) I've replaced the quilted outer cover with a jersey-stretch, zippered, cotton pillow protector. which is lighter weight and more malleable.
As a person who has been traveling for years—by necessity—with a personal pillow from home, I'm now recognizing the extra advantages of this COOP pillow: For travel, its parts all compress well + easily (while for sleeping, the fill is light + lofty, but also supportive, as long as you don't remove way too much). And the pillow's components all readily come apart, so they can be packed separately...even the stuffing can be separated into smaller zip-lock packets, if needed—meaning there's never a need to squish an entire, impossibly big, somewhat dense pillow into a suitcase (or even a compression sack). Quick + easy to disassemble and reassemble. Really, the COOP can be treated as a build-your-own pillow (remember, I changed out the zippered outer cover and adjusted the stuffing volume to my own prefences). It's not cheap, but these days, remarkably, it's doing the trick for me. So glad I didn't get rid of it.
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Reviewed in the United States on February 27, 2026
★★★★★ 5
Great pillow and company
Color: Crescent White, Size: King
I have a couple of Coop Home pillows and loved them. They are several years old and I was on the search for a replacement. I tried 2 other brands, one cost more and the other cost less. Returned 1 and used the other for a short time before I had to go back to my old Coop pillow. I started looking at crescent pillows and did some research. This type of pillow is great for side and back sleepers. Being a side sleeper I looked into the best rated. Coop Home crescent pillow was not rated #1 but it was close. The top rated pillow cost 2.5 times more and I could not justify paying that. I am happy to report that I am waking up less (before every 1.5-2 hours). It comes with extra fill and I love a very firm pillow so I emailed customer service to see if I could get more filling. This was on the weekend and in 1 day they responded that they would be happy to. Now that is great customer service. I sleep warm and have no problem with a hot head. It comes with a cover but I use silk pillowcases and it works fine. I will say when I first got the pillow it was very thin and flimsy. I had some doubts but followed directions and put in the dryer on low. Came out perfect. Highly recommend this pillow and company.
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Reviewed in the United States on April 20, 2026
★★★★★ 5
Best pillow I've ever owned
Color: Cut-out White, Size: Queen
While the pillow looks anemic when it first comes out of its packaging, it puffs/firms up beautifully after time in the dryer. I haven't had any odor issues.
I'm mostly a side sleeper and at first I thought there wasn't enough of the extra fill, so I put it all in. I've ended up needing to take at least half back out to keep my head at the correct angle.
While this can fit in a standard pillow case, it just barely fits and keeps coming out - at least at my fill level. Queen pillow cases are much better.
This is so much more comfortable than any of my previous pillows. I don't need to stack multiple pillows to get the right support. I'm no longer waking up with neck or shoulder or arm pain. I'm recommending it to pretty much everyone and I've purchased a second pillow to keep at my parents for when I visit!
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Reviewed in the United States on May 6, 2026
★★★★★ 5
So nice your wife will steal it for herself
Color: Original White, Size: Queen
This, this is the god of all pillows I’ve ever purchased. It’s the perfect balance of firm and soft and it’s easily adjustable using the added filler. I’m a side sleeper so having a primary pillow is a must. Combined with a decent secondary pillow this one provides a perfect amount of support. This pillow is so nice, my wife ‘borrowed it’.
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Reviewed in the United States on May 27, 2026
★★★★★ 5
Favorite pillow!!
Color: Original White, Size: Queen
Absolutely love this pillow! Bought my husband one a year ago after he was waking up with neck pain. Just recently bought myself one, we both love them! Very comfy and comes with a bag of extra foam to add/remove from the pillow. The zipper on the side of the pillow cover is hidden but durable. We take it with us wherever we go, and always sleep so good.
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Reviewed in the United States on May 30, 2026
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