Proper Spring Locators
All of AFR’s product line come equipped with hardened spring seats (or cups) instead of flimsy shims that most of our competitors use which do not properly locate the valve spring. Flimsy shims get cut by the springs and then circulate metal throughout your engine. They also allow the spring to move around compromising valve control and valve guide seal life (sometimes the springs can work the seals right off the guide boss). All the cylinder heads we assemble and ship have proper spring locators (some ID style and some OD style) to positively locate the spring, keep the seals in place, and not compromise valve control for additional power.