Valvetrain noise won't go away, please help - Page 6 - Chevelle Tech
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post #76 of 106 (permalink) Old Apr 22nd, 20, 2:24 PM
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Re: Valvetrain noise won't go away, please help

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Originally Posted by OneBadA$$68SS View Post
Just noticed this while adjusting

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Is that roller tip cracked??

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post #77 of 106 (permalink) Old Apr 22nd, 20, 2:24 PM
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I would post in Performance section and hope Scott Foxwell or Mark sees it he has done alot of work with rocker / guideplate misalignment issues those look like GM heads I have an opinion in what to do but those guys do this every day
Glad you found something specific as for sure that would throw preload off
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post #78 of 106 (permalink) Old Apr 22nd, 20, 2:27 PM
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Bill
 
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Sure looks like rocker hitting The blue anodizing os gone on one corner and yes roller Looks cracked to me but hard to tell from just a pic your the only that can tell for siure

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post #79 of 106 (permalink) Old Apr 22nd, 20, 2:32 PM Thread Starter
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Re: Valvetrain noise won't go away, please help

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Originally Posted by CDN SS View Post
Sure looks like rocker hitting The blue anodizing os gone on one corner and yes roller Looks cracked to me but hard to tell from just a pic your the only that can tell for siure
Thanks for the update. There was fuzz from the rag I was using that's what your seeing

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post #80 of 106 (permalink) Old Apr 22nd, 20, 2:42 PM Thread Starter
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Re: Valvetrain noise won't go away, please help

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Originally Posted by CDN SS View Post
I would post in Performance section and hope Scott Foxwell or Mark sees it he has done alot of work with rocker / guideplate misalignment issues those look like GM heads I have an opinion in what to do but those guys do this every day
Glad you found something specific as for sure that would throw preload off
You think this is the cause of the noise?

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post #81 of 106 (permalink) Old Apr 22nd, 20, 3:30 PM
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Based on what looks like the rocker hitting and your preload pbly off I would say yes but No one who not actually there can say for sure Post on performance or fo a search in Performance on guideplate alignment Some aftermarket heads are more problematic what heads do you have

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post #82 of 106 (permalink) Old Apr 22nd, 20, 3:32 PM Thread Starter
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Re: Valvetrain noise won't go away, please help

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Originally Posted by CDN SS View Post
Based on what looks like the rocker hitting and your preload pbly off I would say yes but No one who not actually there can say for sure Post on performance or fo a search in Performance on guideplate alignment Some aftermarket heads are more problematic what heads do you have
The rocker isn't hitting the retainer though. Just way off the side. I'm running a BBC 206 oval port head.

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post #83 of 106 (permalink) Old Apr 22nd, 20, 4:03 PM
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Ok its not hitting then I would start by Redoing geometry On intake when you set rocker 90* to valve head does rocker Clear everywhere and rocker riding on smooth part of stud of that ok then move to turning adjuster to het to half lift recheck stud to rocker
Typically you cant use the stock GM studs you need to get ones with longer smooth shank and less threads
Then put your adj pushrods in. Adj to get zero lash And see if guideplate allows the rocker To Stay aligned during a rotation
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post #84 of 106 (permalink) Old Apr 22nd, 20, 4:41 PM
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Re: Valvetrain noise won't go away, please help

You need adjustable pushrod guide plates.
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post #85 of 106 (permalink) Old Apr 22nd, 20, 4:45 PM Thread Starter
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Re: Valvetrain noise won't go away, please help

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Originally Posted by CDN SS View Post
Ok its not hitting then I would start by Redoing geometry On intake when you set rocker 90* to valve head does rocker Clear everywhere and rocker riding on smooth part of stud of that ok then move to turning adjuster to het to half lift recheck stud to rocker
Typically you cant use the stock GM studs you need to get ones with longer smooth shank and less threads
Then put your adj pushrods in. Adj to get zero lash And see if guideplate allows the rocker To Stay aligned during a rotation
I just ordered the adjustable guide plates. I watched the rocker geometry video online and everything is centered. The current guide plate is not allowing me get that roller centered. I do have aftermarket studs that are taller, I just got them last week.

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post #86 of 106 (permalink) Old Apr 22nd, 20, 4:51 PM
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Re: Valvetrain noise won't go away, please help

You are not running 5/16" push rods in 3/8" guide plates are you? that would cause that problem for sure.


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post #87 of 106 (permalink) Old Apr 22nd, 20, 4:53 PM Thread Starter
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Re: Valvetrain noise won't go away, please help

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You are not running 5/16" push rods in 3/8" guide plates are you? that would cause that problem for sure.
Nope, 3/8 push rods in 3/8 guide plates

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post #88 of 106 (permalink) Old Apr 22nd, 20, 4:56 PM
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Re: Valvetrain noise won't go away, please help

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Originally Posted by OneBadA$$68SS View Post
Nope, 3/8 push rods in 3/8 guide plates

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Who's guide plate are you using? I had one set I got with a set of heads that the guide plates were aftermarket that turned out to be for some heads that were for BBC heads that were rolled (different valve angles) I could not get the rockers to work with my factory heads.


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post #89 of 106 (permalink) Old Apr 22nd, 20, 5:04 PM Thread Starter
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Re: Valvetrain noise won't go away, please help

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Originally Posted by 68Chevele View Post
Who's guide plate are you using? I had one set I got with a set of heads that the guide plates were aftermarket that turned out to be for some heads that were for BBC heads that were rolled (different valve angles) I could not get the rockers to work with my factory heads.
I actually don't know, they were on the engine when I got it

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post #90 of 106 (permalink) Old Apr 22nd, 20, 5:16 PM
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Re: Valvetrain noise won't go away, please help

I was told by a pro builder here on TC that a min of .020 is needed in the cup of the guide for PR clearance but I'm not sure on the sides, so your guides are holding your PR's from centering the rockers on the valve tip? I've heard of cutting and welding the guide plates but adj. sounds a lot easier


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