BTR Brian Tooley. 650 Ultimate RPM Valve Spring Kit LS 4.8 5.3 5.7 6.0 6.2 LS1
Brian Tooley BTR Ultimate RPM. 650 Spring Kit for LS engines. The Ultimate Spring kit for your Hydraulic roller LS. When you want the tach to be north of 8000 rpm on the gear change, this is the kit for you. Spintron tested and verified to be what is required for stability in Ultra high RPM hydraulic roller combinations. We recommend all 16 spring heights be checked and clearances verified during installation. Johnson or equivalent lifters required for optimum results. Includes dual springs, matching titanium retainers, locators for stock diameter guides, locks, and seals. Coil bind at 1.000. Compatible with all OEM LS head castings except LS7/LS9. Also fits many aftermarket LS heads including Trick Flow.
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