• Description
  • Additional Information
  • Shipping & Return

Valve seat grinding stones are small, abrasive wheels used to reshape and refinish the valve seats in an engine cylinder head. The valve seat is the machined surface in the cylinder head where the valve meets to form a seal. Over time, the valve seat and valve can wear, reducing their sealing effectiveness. Valve seat grinding stones are used to restore the proper angle and surface finish of the valve seat for a tight seal.

Valve Seat Sioux Style Grinding Stones:

  1. Grid: These grinding stones are made from verified bond 80 Grit medium aluminum oxide pink Stones with Diameter of 0.69 Inches.

  2. Angel: Angel of the stones is 45 degrees. Stones can be "dressed" with a dressing stick to maintain their shape and cutting efficiency with thread intact.

  3. Sizes: Stones sizes are given below:

    Stones Size



    1-1/8” inch

    Sioux Style (11/16” Thread)


    1-1/4” inch

    Sioux Style (11/16” Thread)


    1-3/8” inch

    Sioux Style (11/16” Thread)


    1-1/2” inch

    Sioux Style (11/16” Thread)


    1-5/8” inch

    Sioux Style (11/16” Thread)


    1-3/4” inch

    Sioux Style (11/16” Thread)


    1-7/8” inch

    Sioux Style (11/16” Thread)


    2” inch

    Sioux Style (11/16” Thread)


    2-1/4” inch

    Sioux Style (11/16” Thread)


    2-1/2” inch

    Sioux Style (11/16” Thread)


Valve Seat Sioux Style Stone Holder:

  1. Compatibility: Ensure the holder matches your Sioux-style grinder's thread size (typically 11/16").

  2. Material: They're usually made from durable steel construction for longevity.

  3. Drive Ball: Heavy Duty Sioux 11/16" Thread Valve Seat Grinding Stone Holder with Star Drive Ball.

  4. Pilot compatibility: Check if the holder works with your preferred pilots for accurate stone alignment.

  5. Ease of use: Look for a design that allows for quick and easy.

Benefits of Using Valve Seat Grinding Stones:

  1. Restored Valve Seal: Worn seats can leak, reducing engine performance. Grinding resurfaces the seat for a tight seal with the valve, leading to better power and efficiency.

  2. Precise Valve Angles: Improper angles compromise sealing. Grinding allows for correction to factory specifications, improving engine operation.

  3. Extended Engine Life: Properly seated valves ensure optimal compression and combustion, contributing to a longer engine lifespan.

  4. Cost-Effective Repair: Reconditioning with grinding stones is often cheaper than replacing the entire cylinder head.

Additional points:

  1. Grinding requires a certain level of expertise and specialized tools. It's recommended for experienced mechanics or machine shops.

  2. Choosing the right stones for your specific valve seat material is crucial. The wrong abrasive can damage the seat.

Bulk Order Discounts

We are pleased to offer bulk order discounts to our valued customers. To take advantage of these discounts, please contact us directly with the following information:

Quantity of products:

Please specify the exact number of units you wish to purchase.

Product Details

Clearly identify the products you are interested in, including any specific models, colors, or configurations.

Shipping Address:

Provide your complete shipping address, including street address, city, state, zip code, and country.

Preferred Delivery Date

If you have a preferred delivery date, please let us know so we can make arrangements to meet your timeline.

Once we have this information, we will promptly generate a detailed quote that includes the best possible pricing for your bulk order. Additionally, we will provide express shipping options to ensure your products arrive quickly and safely.

We appreciate your interest in our bulk order discounts and look forward to hearing from you soon.

Shipping Options & Delivery Costs

We offer the following shipping options – DHL Express, USPS, UPS Express without any additional cost to you except few postal codes which comes under Remote Area Delivery (RAD) – If your delivery postal codes comes under RAD then we will charge USD 40 per shipment extra at the time of checkout.

Order Processing Time

All orders placed between Monday to Friday are processed and dispatched within 2 working days. All orders placed during the weekend or on a public holiday will be sent from our warehouse on Monday or on the next business day.

Delivery Address & P.O. Boxes

Please note that we are unable to modify the delivery address once you have placed your order. We are sorry but we do not ship to P.O. boxes

Import / Custom Duties

If your delivery address is in US / Canada / Australia, then please worry free about the import / custom duties because in these countries we will handle the duties levied on our buyers. For rest of the countries mentioned above, your package may be subject to import duties and taxes. You, as the customer, are responsible for paying those fees. We recommend that you check with your local customs office before placing an order on our website as these fees can sometimes be significant and we are unable to calculate these for you.

Tracking Your Order

Once your order has been dispatched, we will send you a confirmation email with tracking information. You will be able to track your package directly on the carrier’s website.

Returns, Refunds, and Exchanges

We want you to be completely happy with your purchase. If you are not happy with the product / services, please contact us on Email: sales@actoolshop.com or Phone Number: +91-9466950548, we will either exchange the product or issue full refund to you.

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