The Edelbrock #9644 retainers are designed to be used with springs featuring 1.55" O.D. and 1.125 I.D. Theses retainers require 11/32" Valve Stems with 7- degree locks. Works with #5792 Valve Springs.
Edelbrock 16- Retainers Perf RPM 440 60189 60929 Heads