Guide Plates or Not...
Melting Slicks
Joined: Mar 2002
Posts: 3,108
Likes: 126
From: S.L.C. UT
Re: Guide Plates or Not... (autotech)
I don't think guide plates are your problem. Actually you aren't suppose to use guideplates with self aligning rockers. Guide plates are only suppose to be used with non self aligning rockers. Your noise is probably noisey lifters, or some other sort of valve train noise.
Thread Starter
Racer
Joined: Oct 2003
Posts: 273
Likes: 0
From: Midland Texas
Re: (scorp508)
I adjusted them static on the engine stand and then again with the engine running, same result both ways. Ive been doing this a long time and its just flat noisey, but I dont know what a self aligning rocker is either...The engine is a new overhaul and the roller lifters are new...Do you think if I mixed up the rocker pivots with the rockers it would cause excessive noise?
[Modified by autotech, 1:02 AM 11/14/2003]
[Modified by autotech, 1:10 AM 11/14/2003]
[Modified by autotech, 1:02 AM 11/14/2003]
[Modified by autotech, 1:10 AM 11/14/2003]
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
Re: (autotech)
but I dont know what a self aligning rocker is either...
See the little tabs that hang slightly down from the roller tip? Those are the self-alignment tabs that keep the valve stem on the roller.
[Modified by scorp508, 8:19 PM 11/13/2003]
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: (autotech)
A self-aligning rocker arm is one that has ridges of metal on either side of the valve stem to keep the rocker arm from rotating on the stud, off of the valve stem. Chevys with stud mounted rocker must have a way to keep the arm aligned over the valve stem. Some cast iron heads have a narrow slot where the push rod passes through the head. Some hi perf heads use guide plates for the push rods mounted between the head and the hex portion of the screw in studs. Lastly, there are the self aligning rockers. Due to the possibility of "competeing forces" or interference, it is reccommended that only one method of alignment be used at a time. Good luck, and...
RACE ON!!!
[Modified by CFI-EFI, 6:15 PM 11/13/2003]
RACE ON!!!
[Modified by CFI-EFI, 6:15 PM 11/13/2003]
Team Owner
Joined: Mar 2000
Posts: 83,383
Likes: 87
From: Boston, MA
Re: (autotech)
SCORP - surely you mean that the tabs keep the rocker on the valve stem??? - and that is informative - but again I am using stock stamped steel rockers... :thumbs:
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Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: (autotech)
Some late stamped steel rockers are self aligning. And, Scorp meant to say "valve stem", not "push rod". If you had none of the three methods of alignment working for you, you would be complaining of more than "just a little noise". Look at the valve end of your rocker arm. Is there an area that the valve can run against between two ridges?
RACE ON!!!
RACE ON!!!
Thread Starter
Racer
Joined: Oct 2003
Posts: 273
Likes: 0
From: Midland Texas
Re: Guide Plates or Not... (autotech)
So anyway, Ive built lots of stock 350's with flat tappet lifters, and their quiet as can be. Whats up with this? I cant see the roller lifters being any louder. I have 65 pbs oil pressure cold idle and as low as 25 hot idle, I dont think that is a problem....We'll I'll tell you what. When the engine is cold I dont hear the valve train and when it is at operating temp., I do. The damn lifters are not staying pumped up when the viscosity breaks down...
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Guide Plates or Not... (autotech)
Your stock '88 L98 has non-functional guide plates and self-aligning stamped rockers. Though the stock rockers are not roller tips, the little alignment tabs are very similar to those shown by Scrop in that pic though not quite as pronounced.
If you mixed up any of the valve train components it could account for the issue. Each setup of parts wear in together and must be put back into the same locations otherwise new wear patterns will be established.
Also you should have used a film of light assembly lube on the pushrod tips where they contact the new lifters (you did install new lifters??).
If you mixed up any of the valve train components it could account for the issue. Each setup of parts wear in together and must be put back into the same locations otherwise new wear patterns will be established.
Also you should have used a film of light assembly lube on the pushrod tips where they contact the new lifters (you did install new lifters??).
Drifting
Joined: Feb 2003
Posts: 1,978
Likes: 2
From: San Antonio Texas
Re: Guide Plates or Not... (autotech)
All the above, plus I've heard that the newer fast-acting cams can be somewhat noiser, due to lifters smacking the lobes trying to keep up with the steep ramps of the lobes. Both on the up side, and the down side. Or something to that effect. Personally, I kinda like it; sounds like an old solid lifter Vette motor.
:chevy
[Modified by Curveit, 5:16 AM 11/14/2003]
:chevy
[Modified by Curveit, 5:16 AM 11/14/2003]
Drifting
Joined: Apr 2003
Posts: 1,292
Likes: 2
Re: Guide Plates or Not... (65Z01)
.
Also you should have used a film of light assembly lube on the pushrod tips where they contact the new lifters (you did install new lifters??).
Also you should have used a film of light assembly lube on the pushrod tips where they contact the new lifters (you did install new lifters??).