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Typically, if you hear VTC rattle, it's your cam gear and it's only fix is a new gear. Upgraded cams seem you expedite the failure/constant rattle of said gear. New gear or remove it completely. However, I am an advocate for the VTC and it makes gobs of torque on the SR down low where it's needed. I made 315ftlbs on my S14 SR at 13psi from 4-4.5k.
No you cannot keep VTC on an S13 block.
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