The below is my HEMI with a KNOCKING sound, that happens on COLD STARTUP only, then goes away after the truck got warm. Eventually, after 2-3 months, it started to happen all the time. But initally, it was cold startup only.

 

Not a knock. Sounds like your manifold bolts are broken

 

LOL. Wrong. It is a knock. Search YouTube for hemi manifold bolts broken. You'll see it produces a tick, similar to valve noise.

As for my noise, the engine was taken apart and they found a piston was 3,000 of an inch too small for the bore.

http://youtu.be/fJCjjhcaTEM

This is manifold problems. A tick

 

That is what mine sounded like when the manifold bolts broke, don't need a youtube

.003? How does that happen? And out of curiosity, did they replace the whole engine or bore it .010?

 

IM with OJ.thats what the manifold sound like when the bolts break....one piston out? sounds like a BS story to me, you need a new engine, thats obviously a lemon.............

IF you ever ran a motor , like a detroit, with a spun bearing, then youd know what a knock is, your motor also sounds like one thats been bored once too many times.

 

My '09 was quiet as a mouse on cold start up til the exhaust manifold bolts broke

 

Mines not and its not broken bolts. Once in runs a minute or so it gets quiet. You can stand next to it and hear things. My vette and Marquis are the same way. The 6.2 in the vette being to nosiest of the 3.

 

the hemi tick has been around since the 1960's on all 426 hemi's and now on the 5.7.
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not to change the subject.
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i am about to purchase a bully dog triple dog gas tuner mod # 40430 for a 2012 dodge ram 5.7 hemi pickup.has anyone installed this tuner apparatus on this forum for a 2012 hemi pickup ??
this unit is brand new.i have seen it one time installed on gears tv with stacy davids.
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*** 2012 dodge ram hemi pickup quad cab 1500,redddddd ***
retro solution 55 watt digital hid headlamps.
mopar cold air intake system.
rear firestone ride rite coil spring air bags.
timbren rear loadleveler suspension system.
tekonsha trailer brake controller.
sylvania ultra fog lamps.
mopar oem running boards.
mopar tonneau cover & bedliner.
painted body side moldings.
soon to be installed,bully dog tuner mod # 40430.
photos coming.
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*** motion ***

 

^^^ You'll likely get a better response with a separate thread regarding the Bully Dog Tuner.

 

Bully Dog has been big in diesel tuners. I'd pass on a gas engine if they just debut it. Super Chips or a Diablo.