Valve Spring Specifications
All springs supplied with AFR Cylinder Heads are made with high quality spring wire and are sufficient for most general applications when following the below recommendations. Keep in mind that forced induction, Nitrous Oxide, high RPM and even modest RPM with agressive cam lobe designs require higher spring pressure and possibly different spring material.
AFR offers various upgrades in addition to our standard valve springs. If you are questioning the spring requirements for your particular application, PLEASE contact AFR directly. It is always better to run a better quality spring than is needed, resulting in greater reliability and longer spring life.
Spring Rates may vary plus or minus 5% compared to advertised. It is the responsibilty of the customer to verify that the springs are correct for your specifc application. Failure to do so could result in engine damage.