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Lifter/Valve noise left side uper engine 05 WRX
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Old 27 Oct 2011, 05:42 PM   #1 (permalink)
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Lifter/Valve noise left side uper engine 05 WRX

I have an 05 WRX. 70k miles. Cobb stage 2. I recently blew an upper radiator hose and over heated the engine while on the freeway. It blew the head gaskets. and had the heads checked for warping and had them milled and replaced the head gaskets. The cylinder walls were perfect (no damage). I gauged all lifters to make sure the clearances were to speck. Now, when driving I hear a rattle between about 2500 rpm and 3500rpm when the engine has no load (no acceleration or deceleration). If I throttle hard it doesn't do the noise, and if I let off hard it doesn't make a noise. If I lift the hood and rev it I can't hear it. Only when driving and holding the RPMs between 2500 to 3500 without load. The sound seems very much like lifter noise, or almost like there's a spring loose on a valve. Car performance still seams perfect. Thoughts? Risks?
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