It could be either,you need to trace noise before it warms up,the only exhaust that will make that type of sound would be a exhaust manifold leak,if the noise is the top half of the engine,take a long extension and touch along the valve covers and hold it to your ear,just touching your ear.
YEP, THE LIFTER IS THE CAUSE. ADD SOME OF THOSE ENGINE CHEMICALS THAT ADVERTISE QUIET NOISY LIFTERS. GET A GOOD NAME BRAND AND FOLLOW THE INSTRUCTIONS.
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