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was tune-up routine? now Solid lifters



The shims are not normally a wear item. The cam and shim (or lifter in the case of the hydraulic head) are much like a ball bearing in that they have very hard surfaced and under normal condition will have virtually no wear, but once there is some wear it essentially destroys both surfaces.
Certainly if the shim did wear you would no longer have the required flat surface and an even distribution of surface stresses (which are really high in these components anyway). Once there is wear the stresses rise dramatically and there will be surface pitting and scratching and the parts will quickly deteriorate.
So, basically if the shims look flat and smooth they aren't worn.
I do agree that you should at least check clearance though.  The base circle of the cam should be accurate, but depending on who manufactured it, it could easily vary a couple thousandths.
All bets are off with regrinds.
Dan

From: "Jeff Toomasson" <area53@validpath.com>
Sent: Friday, July 21, 2006 12:02 PM
Subject: Re: was tune-up routine? now Solid lifters


> If you're assuming your shims have no wear on them after however many miles are 
> on them, then sure. All I want to emphasize is that the gap should ALWAYS be 
> measured on a solid-lifter-ed cam change-out and shims changed out as necessary.
> 
> JT
> 
>> Untrue...  Unless the base circle is different (shouldn't be), you will not
>> have to change out the shims.  I've never had to change shims with any cam
>> I've installed.  The gap is measured with the lobes
>> pointing up...
>> 
>> Later,
>> 
>> Mark.
> 
> 
> 
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