Valvetrain noisy question
Thread Starter
Former Vendor
Joined: Feb 2002
Posts: 7,812
Likes: 3
From: DFW, TX www.vettestripes.com
St. Jude Donor '03-'04-'05-'06-'07-'08
Valvetrain noisy question
Hi,
I got G5X-2 cam, 5.3 stage 2 heads with Patriot gold spring pkg, stock length harden push rods, stock lifters, and stock rockers.
Recently, the valvetrain seems noisier so I just opened up both valve covers and everything looks fine.
No broken spring. All the rockers still stay at the center of all the springs so I don't think there is any valvetrain geometry issue.
I think I may have broken lifters since the noise comes out on both sides OR maybe I haven't driven it for a while so may have forgotten how noisy my valvetrain was
.
Would bent push rods making valvetrain more noisier?
My car idle just fine ... feel a bit weaker tho (but this is the symtom for all C5's owners who just feel their Vettes slower and slower without adding more mods)
Thanks in advance y'all!
-Mike
I got G5X-2 cam, 5.3 stage 2 heads with Patriot gold spring pkg, stock length harden push rods, stock lifters, and stock rockers.
Recently, the valvetrain seems noisier so I just opened up both valve covers and everything looks fine.
No broken spring. All the rockers still stay at the center of all the springs so I don't think there is any valvetrain geometry issue.
I think I may have broken lifters since the noise comes out on both sides OR maybe I haven't driven it for a while so may have forgotten how noisy my valvetrain was
.Would bent push rods making valvetrain more noisier?
My car idle just fine ... feel a bit weaker tho (but this is the symtom for all C5's owners who just feel their Vettes slower and slower without adding more mods
)Thanks in advance y'all!
-Mike
Le Mans Master
Joined: Aug 2005
Posts: 7,201
Likes: 0
From: DP(oh you know where) IL
St. Jude Donor '06
hmmm, franktank recently had this happen. all of a suden after about a month or two, he started getting valvetrain noise. I think his ended up being pushrods. PM him about it and also ttt for you
Pro
Joined: Dec 2004
Posts: 672
Likes: 22
From: L. B. Ca
Originally Posted by mike76002
Hi,
I got G5X-2 cam, 5.3 stage 2 heads with Patriot gold spring pkg, stock length harden push rods, stock lifters, and stock rockers.
Recently, the valvetrain seems noisier so I just opened up both valve covers and everything looks fine.
No broken spring. All the rockers still stay at the center of all the springs so I don't think there is any valvetrain geometry issue.
I think I may have broken lifters since the noise comes out on both sides OR maybe I haven't driven it for a while so may have forgotten how noisy my valvetrain was.
Would bent push rods making valvetrain more noisier?
My car idle just fine ... feel a bit weaker tho (but this is the symtom for all C5's owners who just feel their Vettes slower and slower without adding more mods)
Thanks in advance y'all!
-Mike
I got G5X-2 cam, 5.3 stage 2 heads with Patriot gold spring pkg, stock length harden push rods, stock lifters, and stock rockers.
Recently, the valvetrain seems noisier so I just opened up both valve covers and everything looks fine.
No broken spring. All the rockers still stay at the center of all the springs so I don't think there is any valvetrain geometry issue.
I think I may have broken lifters since the noise comes out on both sides OR maybe I haven't driven it for a while so may have forgotten how noisy my valvetrain was
.Would bent push rods making valvetrain more noisier?
My car idle just fine ... feel a bit weaker tho (but this is the symtom for all C5's owners who just feel their Vettes slower and slower without adding more mods
)Thanks in advance y'all!
-Mike
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
A lot of guys put up with the noise because they need more lifter preload to quiet them down. 0.080" - 0.100" will result in a quiet valve train. You should measure your preload and then increase length appropriately. I know someone running a Comp cam that others have noise with and his sounds stock as far as valve train noise.
Thread Starter
Former Vendor
Joined: Feb 2002
Posts: 7,812
Likes: 3
From: DFW, TX www.vettestripes.com
St. Jude Donor '03-'04-'05-'06-'07-'08
Originally Posted by 99torchredlb
Normal sound if you changed cam and heads
It is not normal
I have added cam for almost 3 years and G5X-2 was one of the biggest cam at that time and I was one of the very first group on this forum got that cam.
Originally Posted by DPG
hmmm, franktank recently had this happen. all of a suden after about a month or two, he started getting valvetrain noise. I think his ended up being pushrods. PM him about it and also ttt for you
Thanks y'all for responding
-Mike
Burning Brakes
Joined: Mar 2005
Posts: 766
Likes: 0
From: Mooresville NC
Originally Posted by mike76002
Would bent push rods making valvetrain more noisier?
My car idle just fine ... feel a bit weaker tho (but this is the symtom for all C5's owners who just feel their Vettes slower and slower without adding more mods)
My car idle just fine ... feel a bit weaker tho (but this is the symtom for all C5's owners who just feel their Vettes slower and slower without adding more mods
)
Pro
Joined: Nov 2004
Posts: 601
Likes: 1
From: Wa
I have had the same noise, I went and replaced the lifters and used
.050 longer pushrods and noise is gone.. The base circle changes the valve train geometry and you lose preload.. Now it sounds the same as stock now..
.050 longer pushrods and noise is gone.. The base circle changes the valve train geometry and you lose preload.. Now it sounds the same as stock now..
Race Director
Joined: Jun 2004
Posts: 19,459
Likes: 48
From: Schaumburg IL
CI 7-8-9-11 Veteran
St. Jude Donor '06-'10, '13
Originally Posted by DPG
hmmm, franktank recently had this happen. all of a suden after about a month or two, he started getting valvetrain noise. I think his ended up being pushrods. PM him about it and also ttt for you
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Thread Starter
Former Vendor
Joined: Feb 2002
Posts: 7,812
Likes: 3
From: DFW, TX www.vettestripes.com
St. Jude Donor '03-'04-'05-'06-'07-'08
Originally Posted by sugarwolf
I have had the same noise, I went and replaced the lifters and used
.050 longer pushrods and noise is gone.. The base circle changes the valve train geometry and you lose preload.. Now it sounds the same as stock now..
.050 longer pushrods and noise is gone.. The base circle changes the valve train geometry and you lose preload.. Now it sounds the same as stock now..
I was to change the lifters but one of my local Vette friend told me the stock lifters ares good lifters and can handle G5X-2 just fine so I did not change them.
I have put everything back but will open pass side up again tomorrow to check 2 things:
- Make sure rockers are not chewing any valve.
- Make sure no bent push rods.
Thanks y'all
-Mike
Pro
Joined: Nov 2004
Posts: 601
Likes: 1
From: Wa
Originally Posted by mike76002
What lifters are you using?
I was to change the lifters but one of my local Vette friend told me the stock lifters ares good lifters and can handle G5X-2 just fine so I did not change them.
I have put everything back but will open pass side up again tomorrow to check 2 things:
- Make sure rockers are not chewing any valve.
- Make sure no bent push rods.
Thanks y'all
-Mike
I was to change the lifters but one of my local Vette friend told me the stock lifters ares good lifters and can handle G5X-2 just fine so I did not change them.
I have put everything back but will open pass side up again tomorrow to check 2 things:
- Make sure rockers are not chewing any valve.
- Make sure no bent push rods.
Thanks y'all
-Mike
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Did you check the wipe pattern when you installed the cam? Most don't check this and someone recently ate up a set of valves in some aftermarket heads because the rocker was wiping beyond the outer diameter of the valve stem.
