Knocking Sound!!

No, its the stock covers. I removed the covers one at a time and checked the rods and tightened the rockers back to 22. When I started the truck with either cover off you couldn't hear the knocking. Seems likes its echoing off the covers.

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Originally Posted by gagliano7

You said the rockers are hitting the valve covers. Are they aftermarket? That could be your sound. Check and make sure they are tight. Rockers shouldn't be touching the valve cover.

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Originally Posted by coyotes33

No, its the stock covers. I removed the covers one at a time and checked the rods and tightened the rockers back to 22. When I started the truck with either cover off you couldn't hear the knocking. Seems likes its echoing off the covers.

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When you say tightened back....were the rockers loose? If so I would be willing to bet that was your problem.

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Originally Posted by bangbangskeetskeet

When you say tightened back....were the rockers loose? If so I would be willing to bet that was your problem.

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No, I took them off to check the rods.

Fresh oil in there?? Or any oil at all?

Change the oil, my 4.8 has 400K+ on it and right around 4-4500 miles my motor make funky noises. I put in some fresh juice and a new filter and it runs like a top for another 4-4.5K miles with no sounds at all.


.................PS: Put some hose clamps on the heater core lines coming off of the water pump

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Originally Posted by MrHorsepowerLSx

Fresh oil in there?? Or any oil at all?

Change the oil, my 4.8 has 400K+ on it and right around 4-4500 miles my motor make funky noises. I put in some fresh juice and a new filter and it runs like a top for another 4-4.5K miles with no sounds a
.................PS: Put some hose clamps on the heater core lines coming off of the water pump

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Sure does

Does it have cats?

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Originally Posted by skinny chicken

Does it have cats?

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At the moment just manifolds.