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Bull Boost Performance

Dual Spring Kit .660" 660 Steel Titanium Retainers for Chevrolet Camaro Corvette for LS1 LS2 LS3 LQ4 LS4 LS6 L76 L92 L99 LQ9 L33 LSA LS

Dual Spring Kit .660" 660 Steel Titanium Retainers for Chevrolet Camaro Corvette for LS1 LS2 LS3 LQ4 LS4 LS6 L76 L92 L99 LQ9 L33 LSA LS

Regular price $227.41 USD
Regular price $236.16 USD Sale price $227.41 USD
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Shipping calculated at checkout.
.660" Dual Valve Spring Kit Steel Retainers 4.8 5.3 6.0 LS1 LS2 LS3

.660" Lift Dual Spring Kit for LS engines using stock rocker arms. 

Kits ship standard with dual polished springs, locks and the following:

  • Chromoly Steel Retainers
  • Locators for Stock Guides (.505" ID/.060" Thick) 
  • Black Valve Seals

Spring specs are 155 lbs @ 1.780", 380 lbs @ 1.180", 400 lbs @ 1.130, coil bind @ 1.070"  

This is a drop in spring kit for all 15 degree LS heads including LS1 LS2 LS3 LS4 LS6 L76 L92 L99 LQ4 LQ9 L33 LSA, etc, this kit will also fit LS7 heads with approximately .045" of spring shim (part numbers SS015 and SS030).

This kit will NOT fit LS9 engines, please use part number SK006 for LS9 heads.  

Part Type: Valve Spring Kit
Engine Type:   Gen III/IV
Max Lift:          .660"
Style:               Dual

Shipping & Returns

Shipping on most orders in 24-48 hours special orders can be 2-3 days. Returns see Returns Policy.

We have a 30-day return policy on most products, which means you have 30 days after receiving your item to request a return. Some products carry a longer manufacture warranty please contact us if you have questions about items.

To be eligible for a return, your item must be in the same condition that you received it, unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.

To start a return, you can contact us at overthehilltractor@gmail.com. Please note that returns will need to be sent to the following address: 2005 Stuarts Draft Hwy, Stuarts Draft, VA 24477

If your return is accepted at damage or defective, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.

If your return is due to no longer needed, wrong size order, ordered by mistake, found better pricing, etc the customer is responsible for the return shipping cost.

Any item returned over $50 cost we suggest insurance on package.

You can always contact us for any return question at overthehilltractor@gmail.com.

Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, we can only give 72 hours from time package is scanned delivered to accept claims. Please contact within 72 hours of delivery so that we can evaluate the issue and make it right.

Exceptions / non-returnable items
Certain types of items cannot be returned, like fuel related items due to hazardous materials shipping regulations. We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item.

Electrical parts can only be returned if new and in original condition, Used electrical parts are not returnable unless actually defective, contact us with details.

Unfortunately, we cannot accept returns on sale items or gift cards.

Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method within 10 business days. Please remember it can take some time for your bank or credit card company to process and post the refund too.
If more than 15 business days have passed since we’ve approved your return, please contact us at overthehilltractor@gmail.com.

Most items are covered by 30 day warranty, Fuel Related parts are only covered against actually manufacture defect since the fuel produced today breaks down gaskets and seals quickly. Electrical parts can only be returned if new and in original condition, Used electrical parts are not returnable unless actually defective, contact us with details. Returns are handled on each individual item, some items will not require return for refund just that customer submit picture of proof of issue. Please contact us with questions about returns.

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  • Free Shipping

    Free shipping on orders over $150

  • Returns

    See Returns Policy Page

    Returns Policy