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Ships from manufacturer
This item ships directly from the manufacturer. If your order is urgent, please reach out to determine the specific lead time.
PAC Racing RPM Series valve springs were developed using all of the latest advancements from Circle Track and drag racing successes. This valuable, real-life research has been applied to new designs, which allow for performance increases that exceed all demands. RPM springs are made from quality materials and are available in different diameters and pressures to suit your specific camshaft profile.
Combined with quality BTR hardware, this spring package is our go-to upgrade for high-rpm hydraulic roller, stock rocker combinations (as seen in our Max Package 2.0). When paired with lightweight hollow stem or titanium intake valves, high-performance lifters, appropriate trunnion or shaft rocker upgrade, and appropriate setup, these springs are capable of adequate valve-train control at engine speeds approaching 8,000rpm.
Spring Specifications:
Good quality, major difference compared to the btr 660s