ok the vvel makes almost no noise so it's not that. The mechanical lifters are a different story and hr's do that too. there is no hydraulic lash adjustment so when it's cold they are loose when its warm they are tight due to the valve stem expanding, and your thermal coefficients with metal it's how all high rpm race motors with mechanical valvetrain sound. Its is possible however for there to be a problem in the timing set but it is unlikely. take it in if it is really loud seeing as you've had the car for a long time this is a little late to be noticing how loud it is, if they say its normal live with it til it breaks these timing chains never go unless an adjuster fails.
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