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Discussion Starter · #1 · (Edited)
So searching and see a lot of talk about a tapping or rattle due to a clip onto the exhaust, not my problem. On my 2010, I replaced the broken studs with factory hardened studs, manifolds planed, and new OEM gaskets. Everything looks tight and don’t believe it’s an exhaust leak. But when I really get on it, it sounds like what I believe my father used to call “valves floating.” I don’t know how to explain it. I’ve been worried welding nuts onto the broken studs could’ve damaged the heads. Absolutely no codes thrown and it doesn’t appear to affect the performance. More of an embarrassment to really drop the hammer as I can hear it when the windows are down (especially on drivers side when passing objects) so I’m assuming others hear it. My neighbor (Jeeper) says it sounds normal. Is it me? Is it a Hemi thing? Do I keep driving it until it shoots a code or should I have it checked out by a professional?
 

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Valve float is when the valve springs can't close the valves fat enough for the RPM you are running because of the additional reciprocating mass of a pushrod valvetrain. Its why pushrod race engines that rev to 9000 RPM have $10,000 valvetrains.


You don't have valve float, if you did you'd be having misfires or you'd have sent a valve into a piston
 

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John- Before you do anything drastic, what kind of oil are you using and is it in good condition? If your oil is good, you can try an oil additive just to see if that helps before you go any further.
I had success with Lubegard, Marvel's Mystery oil and Rislone on engines that have had valve tick in the past. I know a lot of people don't like oil additives but in your case, it might be worth a try before you spend more money.
 

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I use motorcraft synthetic and every few oil changes I’ll use a Lucas additive.
Don't use Lucas oil additive. It does help the oil cling and climb in the engine but it also causes the oil to aerate which increases metal to metal contact... Not good!

https://wranglertjforum.com/threads/the-story-with-additives.36/

Lubegard Biotech is really good stuff but hard to find. Rislone 16oz additive is pretty good stuff and can be found right on the shelf at Wal-Mart. Marvel's Mystery Oil is great too but requires you to replace 20% of your oil with it and it thins your oil one grade, which means you have to go up one grade to compensate.... Kind of a hassle. I would say get some Rislone or see if you can find the Lubegard.

https://www.walmart.com/ip/Rislone-Engine-Treatment-Concentrate-16-9-oz/23598497

http://www.lubegard.com/~/C-180/LUBEGARD+BIO-TECH+Engine+Oil+Protectant
 
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