HKS valve springs are stiffer springs specifically designed for use with HKS camshafts. As valve train dynamics change with the use of high performance cam profiles and greater lift, stiffer valve springs are needed to optimize valve movement. When changing to a high lift cam, stock springs cannot match the increased valve train movement. Therefore HKS engineered valve springs that are precisely matched to the characteristics of HKS camshafts.

A stringent shot-peening and heat treatment process is applied to the HKS valve springs to provide durable and consistent spring rates over time. Applications with high revving engines will benefit from HKS valve springs, as the risk of valve-float and coil-bind is greatly reduced due to their specific design and construction.

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As soon as the goods are delivered to Buyer, he shall inspect them. Notice in writing must be given to Seller within four (4) calendar days after receipt of goods of any defect or omissions. Failure to give written notice within four (4) calendar days after receipt shall constitute an irrevocable acceptance of the goods. No claim shall be made after the goods are used in any manner or are processed or changed in any way from the original condition. All warranty cards and other items must be included with the product returned to Seller. Only the Buyer and original purchaser of products(s) may request a return upon satisfactory proof to Seller that the goods are defective. In the event of any Buyer's claim and thereafter, Seller shall have no further liability in connection with the claim. No goods may be returned to Seller unless Buyer has notified Seller of the reasons of the proposed returns, and Seller has agreed in writing to the returns prior to shipment. Any return are subject to a twenty five percent (25%) restocking charge. All returns require an RMA (RETURN MERCHANDISE AUTHORIZATION NUMBER) which can be obtained by calling or emailing JDM EXOTICS. Shipping charges are not refundable. Any refused shipment is subject to the ordinary return policy. A 30% restocking fee is applied to any refused shipment. All products, which are approved for return, will be for store credit only. There are no returns on electronics, body kits, hoods, clutches, brake kits, coil overs, intercoolers, wheels, exhausts, turbo kits, superchargers, and any special order items (This includes ALL products that are not in stock at time of purchase).