Bisi can confirm this if my memory serves me correct, but he stated at when an F22ax series motor runs 8000+ RPM, the exhaust rocker arm spacer springs will collapse. Anyhow, that is why he sells this kit to replace these spacer springs, if you have an application that is capable of that RPM.
Installation Photos (took the time to clean & relube parts as well):
Installation Photos (took the time to clean & relube parts as well):
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