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Re: 06 5.3 Loud tick Lifter?
The DOD system has an oil relief, so the momentary loss of oil pressure is a symptom of that. I'd doublecheck that you don't also have cracked exhaust studs on the rear 2 cylinders (very common for ticking noises). But the DOD system is the likely candidate.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING 
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