My first thought is poor oil pressure.
Next thought is bad lifters.
Buy a good valve cover gasket and then pull the cover. It might be something has come loose and all that is needed is to tighten it back up.
Do you have the stock oil pressure gauge or have you installed a mechanical gauge? What is your oil pressure at idle and at speed?
Good pressure damn near pegged. Quiet as a mouse when first started, starts getting up to temp and it literary sounds like rocks under there lol. Oh yea plenty of power, not getting hot or anything else. Can the rockers and push rods be replaced?
Mine is quiet on start up but as soon as the temp gauge begins to move the noise starts. Any of you guys on here have any ideas? A lot of 2.5s I've seen have the same sound but mine is just louder than most.
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