Best Engine Valve Shims of 2026
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Engine valve shims are small metal discs that are placed between the valve stem and the camshaft in an engine. They are used to adjust the valve clearance, which is the gap between the valve and the rocker arm. Valve clearance is important because it affects the engine's performance and efficiency. If the clearance is too small, the valve may not fully close, causing a loss of power and possible engine damage. If the clearance is too large, the valve may not open fully, reducing the engine's performance. Engine valve shims come in various sizes and thicknesses to allow for precise adjustments.
At a Glance: Our Top Picks
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Top 10 Engine Valve Shims
Hot Cams 9.48mm Complete Shim Kit
The Hot Cams 9.48mm Complete Shim Kit is perfect for all your valve maintenance needs. It includes 1.20-3.50mm shims in .05mm increments with 3 shims in each size. The laser-etched size on top of each shim allows for quick and easy identification. This kit is compatible with various ATV models from Arctic Cat, Honda, Kawasaki, Suzuki, and Yamaha. The shims are forged from 4140 steel for durability and longevity.
Hot Cams 7.48mm Complete Shim Kit for Honda CRF
The Hot Cams Shim Kit offers a full set of valve shims ranging from 1.20mm to 3.50mm in precise 0.05mm steps, giving you the flexibility to fine-tune your engine's valve clearance accurately. This kit includes three shims of each size, so you have plenty of options for adjustments without extra trips to the store. Designed to replace OEM parts from various brands, it ensures compatibility and reliable performance for Honda CRF models and other compatible bikes. Plus, being a 100% new aftermarket product means you get fresh, quality components at a great value. Just make sure to check fitment before purchasing to guarantee it suits your bike.
Dorman 02350 Offset Starter Alignment Shim
The Dorman 02350 Offset Starter Alignment Shim is a high-quality steel construction shim that helps to stop whining and/or grinding noises from the starter motor due to improper alignment. It is available in various styles and packs of different quantities. This starter motor shim is constructed to strict engineering quality standards and is backed by Dorman's ASE Blue Seal Certified technical support team.
Hot Cams 7.48mm Complete Shim Kit for Dirt Bikes
The Hot Cams 7.48mm Complete Shim Kit is the perfect solution for all your valve maintenance needs. This kit includes complete shims ranging from 1.20mm-3.50mm in 0.05mm increments with 3 shims in each size. The laser-etched size on top of the shim allows for quick and easy identification. The kit is compatible with various Honda, Kawasaki, Suzuki, and Yamaha dirt bike models. The shims are forged from 4140 steel, ensuring durability and longevity.
Hot Cams 8.90mm Complete Shim Kit for KTM Dirt Bikes
The Hot Cams 8.90mm Complete Shim Kit is an engine valve shims kit that includes 1.72mm-2.60mm shims in 0.04mm increments with 3 shims in each size, perfect for your valve maintenance needs. The kit is compatible with various KTM dirt bike models from 2005 to 2017. Each shim is laser etched with its size for quick and easy identification. The shims are forged from 4140 steel for durability and longevity.
Yukon Gear Super Carrier Shim Kit
The Yukon Carrier Shim Kit is designed to simplify your installation process with its unique interlocking design. This feature ensures that you can easily align and secure the shims, saving you time and effort. Additionally, this kit is compatible with various Ford and GM models, making it versatile for users with different vehicles. By choosing this product, you can enhance the performance of your engine's valve system, leading to improved efficiency. The durability of the materials used also promises long-lasting use, giving you peace of mind during your installation.
SPC FRTLNR Shim 1/16in.
The SPC Shim 1/16in. is designed for versatility, providing universal compatibility for your heavy-duty tandem trucks and trailers. By installing these shims at the ends of torque rods, you can easily adjust the toe and thrust angles, enhancing vehicle handling and stability. This feature is particularly beneficial for ensuring better tire wear and improved alignment. With a quantity of six, you have enough shims to make necessary adjustments, maximizing convenience and efficiency in your maintenance routine. Whether you drive a Freightliner, Hendrickson, or Navistar, these shims offer a practical solution for your vehicle's performance needs.
TACSHIM 1/2"x28 Thread Barrel Shim Kit .223/5.56
The TACSHIM Barrel Shim Kit is designed to help you align and time muzzle devices on barrels with 1/2"-28 threads, specifically for .223/5.56 calibers. It comes with individually packaged shims that are clearly labeled by thickness, allowing you to quickly find the right size and save time during installation. Made from durable 304 stainless steel, these shims provide reliable precision and long-lasting performance. With an outer diameter of .748" and inner diameter of .511", this kit ensures a perfect fit for your barrel setup, making your work smoother and more accurate.
TACSHIM 5/8x24 Barrel Shim Kit for .308 Caliber
The TACSHIM Barrel Shim Kit is designed to help you achieve perfect muzzle brake timing and alignment on your 7.62mm/.308 caliber barrel. Made from high-quality 304 stainless steel, these shims are built to last while maintaining a slim profile that won’t add extra bulk to your barrel. With an outer diameter of .748" and an inner diameter of .635", they fit precisely on 5/8" x 24 TPI threaded barrels. The kit includes a variety of thicknesses, so you can easily find the right shim for your setup, making installation quick and hassle-free.
JEGS Mid-Plate Shim Kit for 7/16” Bolts
The JEGS Mid-Plate Shim Kit helps you properly space your torque converter, making sure the input shaft and pump engage correctly when using 7/16” bolts. This is essential for smooth and reliable operation of your race vehicle’s motor plates. The kit includes three different shim thicknesses (.060", .125", and .250"), so you can adjust the fit precisely whether you have 1/8" or 1/4" mid-plates. Made in the USA, this kit offers high-quality parts and assembly you can trust. For best results, use it with JEGS bolt kits (sold separately) to complete your setup.
Frequently Asked Questions (FAQs)
1. What do engine shims do?
Engine shims are used in automobiles to adjust the clearance or space between two parts, such as valve clearances. They are inserted into or under bucket tappets to control the clearance, and the thickness of the shim can be changed to adjust the clearance.
2. What happens if Valve clearance is incorrect?
Incorrect valve clearance can lead to various issues. Too much clearance can cause valves to clatter and potentially damage the valves, camshaft lobes, or rocker arms. On the other hand, too little valve clearance can prevent the valves from fully closing, leading to excessive heat and loss of engine power.
3. Are valve spring shims necessary?
Valve spring shims are necessary for adjusting the height of the valve springs. This step is critical to ensure optimal engine performance and prevent issues. While it may seem unnecessary, using shims helps maintain proper spring tension, which is essential for the engine's power and reliability.
4. Why do valves need to be shimmed?
Valves need to be shimmed because the constant impact of the valves can cause them to recede deeper into the cylinder head. If left unchecked, the valve stem can eventually come in contact with the components that actuate it, such as the cam or rocker. Shimming the valves helps maintain the correct clearance and prevents damage.
5. How often should I shim my valves?
Valve shimming frequency can vary depending on the engine and usage. As a general rule of thumb, mechanics usually recommend shimming the valves twice during the engine's lifespan. However, it's important to follow the manufacturer's guidelines and have the valve lash inspected at the recommended intervals.
6. How do I know if my valves need adjusting?
If your engine is making a loud clicking or tapping noise during startup or experiencing a loss of engine power, it may be a sign that your valves need adjusting. It's important to have the valve lash inspected at the manufacturer's recommended intervals to ensure optimal engine performance.
7. What are signs of bad valve seals?
Signs of bad valve seals can include conducting a cold engine test, increased smoke levels, higher oil consumption, engine idling issues, compromised acceleration power, and engine misfiring. Checking the oil level and observing the exhaust can also provide insights into potential valve seal problems.
8. What happens if you over tighten valves?
Over-tightening valves can lead to a warped connection, causing various problems. The deformed connection may block fluids, resulting in clogged tubes. It's essential to follow proper torque specifications and guidelines to avoid over-tightening valves and prevent potential issues.
9. What is the purpose of valve spring shims?
The purpose of valve spring shims is to restore proper spring tension in cases where refacing valves and grinding valve seats have caused a loss of metal. By installing a valve spring booster shim under the spring, the lost material is replaced, ensuring the correct spring tension and preventing power loss.
10. What are the benefits of shims?
Shims have various benefits, including providing support and making adjustments for a better fit between objects. They are commonly used in construction and installation projects to bridge gaps, level surfaces, and ensure proper fittings. In the case of engine valve shims, they play a crucial role in maintaining optimal performance and preventing damage.
11. Do you have to use shims?
Shims are essential for adjusting the final fittings of windows, doors, cabinets, and other projects. They are particularly useful when installing trim, doors, windows, or cabinetry, as they help bridge gaps and ensure proper alignment. Additionally, shims can be used to level floors, tables, chairs, and other objects.
During our engine valve shim research, we found 24 engine valve shim products and shortlisted 10 quality products. We collected and analyzed 16,426 customer reviews through our big data system to write the engine valve shims list. We found that most customers choose engine valve shims with an average price of $16.27.
The engine valve shims are available for purchase. We have researched hundreds of brands and picked the top brands of engine valve shims, including Hot Cams, Dorman, Yukon Gear & Axle, Specialty Products Company, TACSHIM. The seller of top 1 product has received honest feedback from 384 consumers with an average rating of 4.7.
Robert Reyes is a dedicated writer from San Francisco with a bachelor of degree in mechanics and a bachelor of degree in marketing. He focuses on making some complicated topics simple and enjoys explaining complex and technical things in an easy-to-understand way.