<VV> Cam experience poll (why I asked)

[Carlton Smith]

Bryan, In my instance, yes indeed the valve geometry was checked and
corrected. It did take longer pushrods. The engine was reassembled with the
Clark's 260 cam and there was no difference in the clicking valves. It was
definitely the cam causing the problem. We cannot point a finger at the
Clark's Sealed power lifters too though. As I said before we tried sticking
a Source lifter that we all know was good in one of the clicking valves and
there was absolutely no difference. Cracked the engine , installed new Isky
260 cam and Source lifters and all was quite right at the start up.

With what Jim Allen is writing as he has used many of the Clark's 260 cams
with only one instance of trouble, this whole scenario may be a fluke in
manufacturing on occasion.

I should have mentioned earlier that the clicking valve would adjust out
quite and come back clicking again in 3-5- seconds.

Carlton Smith

-----Original Message-----
From: Bryan Blackwell [mailto:bryan at skiblack.com] 
Sent: Wednesday, March 09, 2011 3:57 PM
To: Carlton Smith
Subject: Re: <VV> Cam experience poll (why I asked)

One question - did any of the builders check the valve geometry?  Reason I
ask is I got an engine with some valve noise, the builder said it was
because it had too short pushrods.  I'm not really convinced that's true,
but if the Clark's cams are regrinds that would make for a smaller base
circle and perhaps throw off the geometry (depending on what else was done).

--Bryan

On Mar 9, 2011, at 3:42 PM, Carlton Smith wrote:

> I am getting some good replies on guys who have used other cams than the
> Clark's 260. I am taking the poll on the Clark's 260 to see how many other
> out there have used this cam and had a problem with it.
> 
> As I mentioned I know of 3 instances where the brand new Clark's 260 cam
had
> problems and it was pulled out and replaced with other brands. In 2 cases
> (including my 180 engine)it was replaced with a Isky 260 cam. The problem
> may be in the grind of this particular cam. The lifters used do not seem
to
> make the difference. MY engine had the Clarks sealed power lifters and we
> even tried replacing the noisy ones with a new The Source lifter and it
> still clicked. I replaced by Clark's 260 with an Isky 260 and used The
> Source lifters. It did not even clatter upon first start up. The other
> instance the Clark's 260 was replaced with a Isky 270 and they used Sealed
> Power lifters and no problems. 
> 
> I am wanting to know are these three instances with the Clark's 260 cam a
> fluke or is there a real problem with this cams factory grind.
> 
> Carlton Smith
> Indianapolis, IN 
> 
> 
> 
> _______________________________________________
> This message was sent by the VirtualVairs mailing list, all copyrights are
the property
> of the writer, please attribute properly. For help,
mailto:vv-help at corvair.org
> This list sponsored by the Corvair Society of America,
http://www.corvair.org/
> Post messages to: VirtualVairs at corvair.org
> Change your options:
http://www.vv.corvair.org/mailman/options/virtualvairs 
> _______________________________________________