[Shotimes] adjusting valve lash by machining valve stems

[Ian Fisher]

Don
Re-read my orginal post. :) I have no intention of
machining the shims. I am inquiring about machining
the valve stems instead.

:)

Ian "I've asked some strange questions in the past but
that's not one of them" Fisher

lol


--- Donald Mallinson <dmall@mwonline.net> wrote:

> Ian,
> 
> This is a VERY BAD idea!  Here is why.
> 
> Those shims are hardened by a specific heating
> process. 
> That hardening does NOT go all the way through.  By 
> machining the shim, you cut through some if not all
> of the 
> hardening.
> 
> I know, you can machine one side and put that side
> down, and 
> that might work, but the finish on these shims is
> also very 
> specific to the cam surface.  Would the machine shop
> be able 
> to provide the EXACT finish that would help break
> in, but 
> not destroy the lobe on your new cams?  if the
> finish is 
> just a tiny bit more rough, there go your lobes.
> 
> Better to try to get correct new shims and do it
> right.
> 
> Don Mallinson
> 
> Ian Fisher wrote:
> 
> > I wanted to get the list's opinion on shimming
> valve
> > clearances by actually machining down the valve
> stem
> > instead of replacing shims. This was provided to
> me as
> > an alternative method today. It sounded horrific
> at
> > first but now that I think about it it doesn't
> seem
> > like a bad idea. The clearances can be adjusted
> more
> > accurately without the need to purchase any shims.
> The
> > valve would still open and close normally...
> > 
> > My only issue is that I am installing +20's into
> my
> > soon to be rebuilt heads. If I have the valves
> > adjusted for those, I wouldn't be able to swap
> back to
> > stock or +40's without using shims. Hopefully the
> > shims could make up the difference.
> > 
> > I'm also installing bronze valve guides. The shop
> is
> > going to machine the valve seats as well to make
> sure
> > they are as good as they can get. They said that
> > machining the seat will also tighten up my valve
> > clearances. Interesting..
> > 
> > comments? 
> > 
> > Ian
> > 
> > 
> > 
> > 		
> > __________________________________ 
> > Do you Yahoo!? 
> > Check out the new Yahoo! Front Page. 
> > www.yahoo.com 
> > _______________________________________________
> > Shotimes mailing list
> > Shotimes@autox.team.net
> > http://www.team.net/mailman/listinfo/shotimes
> _______________________________________________
> Shotimes mailing list
> Shotimes@autox.team.net
> http://www.team.net/mailman/listinfo/shotimes
> 


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com