From time to time, a rattle with the front in the engine doesn’t automatically indicate the VCT equipment is worn out. The timing chain guidebook about the SR20 and KA24 engines is known to loosen and rattle, knocking within the valve go over since the timing chain moves beneath it. https://deanfijge.qodsblog.com/31998016/an-unbiased-view-of-jdm-nissan-sr20-turbo-engine-for-sale