Quiet valvetrain?
Check and see if the push rods are hitting the pass through holes in the heads. All 3 of the LS engines that I have here were all hitting. Figured this out yesterday when I was checking my preload again. I could see rub marks on the push rods from all 3 engines. 2 of them are stock. It is not as easy to see when you have the shinny metal push rods. The ones I have now have a black coating so it was really easy to see.
Thread Starter
On The Tree
iTrader: (2)
Joined: Mar 2006
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From: lafayette, louisiana
I'll check the pushrods out too. If they are rubbing how do I go about fixing that? Seems like a width issue...
Launching!
Joined: Dec 2005
Posts: 232
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From: nj, edison
i too had a noisy valve train. the important issue is understanding what preload gives the sweet spot for a quieter stock valvetrain.
i had too much preload and so i shortened the pr. and ended up with 3/4 turn as my preload. so for me 3/4 is the sweet spot, car has been quiet since then, 72kmi so far.
i had too much preload and so i shortened the pr. and ended up with 3/4 turn as my preload. so for me 3/4 is the sweet spot, car has been quiet since then, 72kmi so far.
i too had a noisy valve train. the important issue is understanding what preload gives the sweet spot for a quieter stock valvetrain.
i had too much preload and so i shortened the pr. and ended up with 3/4 turn as my preload. so for me 3/4 is the sweet spot, car has been quiet since then, 72kmi so far.
i had too much preload and so i shortened the pr. and ended up with 3/4 turn as my preload. so for me 3/4 is the sweet spot, car has been quiet since then, 72kmi so far.
Alot of noise you hear is from the headers, they are a lot thinner compared to manifolds and they have a pretty distinct metal tinny noise. Pushrod length also can make a difference.
There are so many things working against you for having a quiet valvetrain, but don't mistake a noisy valvetrain for a problem. All engines make noise, some have different harmonics that's all. Take an alluminum head, composite intake, thin walled headers, higher rate camshaft, higher spring pressure and guess what? You're going to hear the valves closing. It's just a fact of life with this motor combo.
