After one of my passes at the track a couple weeks ago I noticed the Hemi tick was a bit louder than normal. Phil and Greg noticed it too as I pulled in to the pits. At first I thought it was an exhaust leak, but after inspecting the exhaust I don't think so. I used a mechanic's stethoscope to check the injectors, etc and when I place it on the passenger side head between cylinders 4 and 6 I can hear a distinct "ping" sound making me think lifter. The lifters are still stock BTW.
I'll pull the plugs probably tomorrow to have a look and if they're good I'll pull the valve cover to have a look at the springs. If that's all good I'm thinking it's gotta be a lifter which is what my gut tells me it is.
The sound ONLY occurs when the engine is WARM. On cold start up NO noise at all which is interesting.
So, figured I'd throw this out here for discussion since this is one of the more technical forums. I'll post up tomorrow when I've had a look at the plugs and springs.
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Update 12/15/2013
Well, I FINALLY got time to pull the plugs tonight. Something seems funky with CYL 6, which is also where I hear the sound with the mechanic's stethoscope. All the plugs looked perfect except for these from CYL 6 which were green??
I'll pull the valve cover when I get time. My suspicion is that the lifter has crapped out and the intake valve isn't opening or isn't opening all the way and this cylinder isn't getting proper fueling, thus the green color.



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