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Description
Wiseco K634M865 Piston Kit - K24 w/ K20 Cylinder Head +5cc (12.5:1 Compression)Wiseco K634M865 Piston Kit Honda K24 w K20 Cylinder Head +5cc (Comp Ratio 12. 5: 1) Acura Honda K20 RSX S 2002 2006 Always check piston to valve clearance If using VTEC or like mechanisms check with longer duration higher lift lobe Always run at least . 030" piston to head clearance including gasket thickness If piston appears to be different than expected call to verify compatibility Also applicable to Acura Honda K24 & K24 (w K20 Cylinder Head) Most
Wiseco K634M865 Piston Kit - Honda K24 w/ K20 Cylinder Head +5cc (Comp Ratio 12.5:1)Acura / Honda K20 RSX-S 2002-2006
Always check piston to valve clearance
If using VTEC or like mechanisms - check with longer duration higher lift lobe
Always run at least .030" piston to head clearance including gasket thickness
If piston appears to be different than expected call to verify compatibility
Also applicable to Acura / Honda K24 & K24 (w/ K20 Cylinder Head)
Most Wiseco Pistons have an offset pin. Pins must be offset same as OEM for quietest operation. Optional pin upgrade available.
Product Specifications:
Bore Size: 86.50 / 3.405
Oversizes: .020
Stroke: 3.286 / 86
Rod Length: 5.472 / 139
Comp Height: 1.181 / 30
Head cc's: 50.5
Dome Dish: 5
Gasket Thickness: 0.025 / 0.630
Deck Clearance: 0.001- / 0.025-
Block Height: 8.347 / 212
Comp Ratio: 11.08
Pins (included): S618 (22mm)
Ring (included): 8650XX
Wiseco Pistons - Sport Compact Series: Wiseco is world renowned for their work building race winning pistons for compact engines featuring small bores multi-valves and high RPM applications for many years. Wiseco utilizes experience acquired from a diverse background of the most sophisticated engines in such venues as Formula 1 Indy Car Racing NHRA Pro Stock Bike AMA Superbike and AMA Motocross to design and manufacture the highest technology Sport Compact piston available.
Generous Valve Pocket designs that allow maximum flow around valve. Note: Piston to
valve clearance must be checked.
Piston Crown shapes designed to promote maximum Intake Charge efficiency thru
scavenging mixture “Cross Flow" during intake and exhaust valve overlap.
Pistons designed to optimize squish or quench during compression combustion cycle
event resulting in resistance to detonation and pre-ignition.
Complex Piston skirt profiles that reduce power robbing friction yet promote stability in
bore for optimum ring seal.
Precision machined ring grooves with proper orifice / accumulator volume using calculated
groove root diameters and axial widths featuring excellent surface finish and flatness
providing maximum ring seal and minimizes blow-by and oil consumption.
World class forging facility that utilizes the latest technologies featuring complex forged
shapes advanced materials and featured-aligned grain flow technology.
Piston weights listed may vary. All specs based on U.S. engine codes unless noted.
All Sport Compact pistons sold complete with rings pins and clips.
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
4.0 ★★★★★
Based on 14 reviews
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Product Reviews
★★★★★ 5
The shirts run true to size and are very well made.
Color: Wine Red-polka Dots, Size: 3X-Large
I want the company COOFANDY and the customers who are considering buying these men's wrinkle free men's shirts for casual business wear, to know that the shirts are beautiful. The material is perfect, and they are made exceptionally well! One of the two shirts that I bought for my husband looks great on him. I had to buy one in a size 2x and one in a size 3x due to the reviews on Amazon's website, where so many of the reviewers stated that the size that they bought ran too small, while other reviewers said the shirt runs too large. My husband tried on the 2x, and it fit him perfectly, which was great because he always wears a 2x. The reason that I am returning them both is that these shirts are tuck-in shirts, and my husband only wears shirts that do not have to be tucked in, such as straight-bottom shirts. I showed him the picture of the shirt in the ad to prove that the models wore them out, not tucked in, but he said the style is wrong for wearing this shirt on the outside, and that he would not be able to wear it. I am so sorry, but I had to return them as he would not ever wear them. But I wanted you, COOFANDY, and your customers to know that the shirts are well worth the money and are just beautiful!
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Reviewed in the United States on May 21, 2026
★★★★★ 5
Perfect fit for my husband
Color: Army Green, Size: Large
Very thick but it's cool, comfortable, no shrinking when washed and no fading. Love this color and the quality of material for the price is top of the line. I will be ordering other colors. My husband really enjoys wearing this and it fits perfectly. Thank you for the excellent work.
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Reviewed in the United States on May 3, 2026
★★★★★ 4
Stylish, Well-Made Shirt—Just Might Need a Touch of Ironing
Color: Black-square, Size: 3X-Large
Why did you pick this product vs others?:
My husband is a big fan of this shirt brand—they offer a great selection of styles, patterns, and fabrics, and the availability of a 3XL is a major win since it’s not easy to find that size. This particular shirt has a classy, lightweight feel with a subtle checkerboard texture that adds visual interest under the light.
The fit is modern and breathable, perfect for summer wear. After washing it straight out of the package, the wrinkles from shipping didn’t fall out, so I wouldn’t call it truly wrinkle-resistant just yet. I’m hopeful that a single pass with the iron will help set it right.
Overall, the shirt looks fantastic and the quality is impressive, especially for the price. Whether for a casual day or dressed up for an event, it’s a versatile choice—just be prepared to give it a little extra TLC after washing.
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Reviewed in the United States on July 5, 2025
★★★★★ 5
Excellent value for your money
Color: Navy Blue-square, Size: X-Large
Comfortable with a slight stretch to the material. Wrinkles were minimal to nearly none after a day of wear. Material is soft with a nice feel to it. Overall great quality and would definitely recommend!
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Looks great and no need to iron
Color: Light Blue-square, Size: Large
The wrinkle-free dress shirts from COOFANDY are an easy addition to my wardrobe. They are affordable and look nice with colors that pop and a comfortable fit. Plus, I never have to iron!
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Reviewed in the United States on May 15, 2026