[Shotimes] valve clearance questions

[Donald Mallinson]

Putting +20's in my old '89.  Found on the front head normal shim sizes 
worked, but on the back we needed some in the 2600 range.  Still working 
on the project, hoping to find the right shims. 

could one of the cams have been cut down more than the others?

Don Mallinson

Mike Bruce wrote:

>I did a set of +20s today.  Ended up using mostly stock sizes.  The
>smallest was 2325 to get the cam on the tight end.  Half of the rear
>head was dead on the tight limit, .006 and .010, using the shims that
>have been on the car for 120k.  The worst was a change of .006".  It's
>hard to tell whether that is due to the stock cam, new cam, or valve
>height. 
>
>I did have some trouble using the bucket depressor.  After grinding some
>on the inside of the hook, I was able to get the process to go nice and
>smooth.
>
>-----Original Message-----
>From: shotimes-admin@autox.team.net
>[mailto:shotimes-admin@autox.team.net] On Behalf Of Mark Nunnally
>Sent: Sunday, May 08, 2005 10:18 PM
>To: shotimes@autox.team.net
>Subject: Re: [Shotimes] valve clearance questions
>
>Ian (and anybody putting in these cams) after doing the 40's, I would do
>things different.  When you pull the cams out, put the thinnest shims in
>you
>have.  This will make it easier to use the valve tools (it's much harder
>with the reground base circles, shims and buckets bumped up with the
>lash
>caps, etc).  Then, find the clearance with the thin shim, figure how
>much up
>you need  to go,and drop in the correct size.  Will be easier with
>monkeying
>around with the thicker ones and the valve tools.  And you may find the
>thin
>ones may be close anyway...
>
>the 20's may not be as bad as the 40's, but I'd still do it that way.
>
>  
>
>>Check clearance between the lobe and add difference to
>>the size of the shim that's already in there.
>>    
>>
>
>Actually between the base circle and shim, but yeah...same thing (you
>want
>the lobes pointed up)
>
>  
>
>>I'm not looking for anyone to rub a crystal ball and
>>tell me what shims I need. I'll figure it out when I
>>check the clearances using the proper tools. Just
>>wondering what I should expect to find..
>>    
>>
>
>I had to use really really thin stuff when I did the +40's, and that was
>to
>barely to keep them in range (they are on the tight end of spec).  I
>basically depleted my thin shim stash (2300 range) doing them.  Things
>may
>be different with the 20s.  I will say they are pretty consistant, so
>the
>grinder does a good job with that.
>
>mark
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