Can I run B series Tuner 1 camshafts with my OEM factory valve springs and retainers?

Yes. These camshafts can be run on factory valve springs and retainers. Note that if the valvetrain in the engine is more than ten years old, we recommend upgrading the valvetrain as it will be more stable in the upper RPM ranges. Additionally, anyone running these camshafts on boosted engines should upgrade their valve springs as boosted engines require more seat pressure to remain stable.