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A little history. I put on headers a couple months ago so I know it's not an exhaust leak, it at least it should not be. It also sounds different than when I had the stock exhaust manifold on that was cracked. I recently had my radiator replaced and my transmission flushed 3 times because of the transmission cooler leaking into the radiator contaminating my transmission. The transmission shifts great for now, hoping it stays that way but doubt it. Since I got it back it's ticking, even when it's warmed up. It's loud, you can easily hear it inside the cab when giving it gas. It's been very cold where I live, -1 this morning. You can hear it when first started and goes away about a couple minutes of idling but you can always hear it when you give it gas. I checked the oil, looks find but might be a little overfilled, could that be it? I also put 91 octane gas in it not knowing I should feed her the 89 or 87.

I've heard these engines like to tick, specially in cold weather but it did not do this before I had the radiator replaced. When I pass a wall, it's super loud.

Does this sound like engine slap or valve lifting? Something I should be concerned about?
 

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Sure sounds like an exhaust leak. I know you said it's not, but it sure acts like it, especially just after the change of hardware? The radiator exchange shouldn't have anything to do with a noisy lifter. Were the exhaust donuts replaced with new ones? Is the ticking verified to be coming from the lifter area? Many questions indeed here.
 
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