Stuff expands when it warms up, you could have a bearing or something that's got no play when it's cold, but develops some play when hot.

 

i have the same problem. thought it was because i had low oil, but i checked and it is topped off. let me know what it is when you figured it out. i would sure like to know what the problem is so i can resolve it too. i have a o4 6mt coupe with 70k now.

 

Took it to infiniti. After a day they called saying they are going to replace the engine. I get to hold on to the loaner until the new engine comes in as they decided it could be a safety issue. Right Before I took it to infiniti I did a round trip drive from Washington DC to Toronto lol.

 

^^that is definitely NOT what i wanted to hear.

 

new engine is running great no more of that nasty sound. I am following a hard break-in routine (revving it high often) as opposed to babying it. ^^^ btw I was in Boston last week and it was FREEEEEEEEEEEZING COLD. I've been to toronto quite often but the cold from last week in boston was at a natural disaster level.

 

Okay so mine kind of sounds like this....I will check tomorrow morning and hopefully it doesn't!

 

I just picked up a lower plenum off a non-rev up 350z today!!

Thanks for posting your results!

Where was the machine work done on the lower plenum?
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^^WTF is up with all these spammers?????

 

My Girlfriend's G35 sedan/automatic with 37,000 miles started clanking in the valvetrain area upon starting cold yesterday. It was upper engine and quite loud. There were no noises or oil consumption prior to yesterday and oil changes are regular with Mobile 1. The engine has always been super quiet with no camshaft or lifter noise at all. I have it at the dealership. When the car warmed up, the sound although diminished was still there. They have changed the oil and will check it this morning when cold. I have not heard from them, and assume this will not be a minor job.

 

I'm assuming the long block doesn't include the plenum as I still have the old plenum after the long block assembly was replaced ?

 

It's just a long block, everything else is swapped over from your original VQ.