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Fitment for:660" Lift Dual Spring Kit for LS engines using stock rocker arms.This kit will NOT fit LS9 engines 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.Perfect after-sales service:1.We maintain high standards of excellenceand strive for 100% customer satisfaction!Please don't open cases or return requests without contacting us.If you have any questions about quality, shipping or other problems, please contact me first via eBay message.I will give you a satisfy solution.2.If you are not sure if these are the right parts for your truck please email me your bill of material number and i.

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