<VV> Cam experience poll (why I asked)

[Carlton Smith]

Chuck, 

We have not gone quite that far as to comparing the Clark's 260 to a stock
cam. However, we (my mechanic actually)have visually compared the Clark's
260 to the Isky 260. The Clarks has a very abrupt flat ramp after the base
circle. The Isky 260 has a noticeable gradual ramp.

Carlton Smith 

-----Original Message-----
From: BBRT [mailto:chsadek at comcast.net] 
Sent: Wednesday, March 09, 2011 5:32 PM
To: Carlton Smith
Subject: Re: <VV> Cam experience poll (why I asked)

Did you measure the lobes with a caliper or micrometer AFTER removing it? If

not, it would be interesting. Secondly, carefully check the taper on the 
lobes and make sure it is or they are tapered the same direction a stock cam

is tapered.

Chuck S
----- Original Message ----- 
From: "Carlton Smith" <carlton55 at comcast.net>
To: "'Bryan Blackwell'" <bryan at skiblack.com>; <virtualvairs at corvair.org>
Sent: Wednesday, March 09, 2011 5:20 PM
Subject: Re: <VV> Cam experience poll (why I asked)


> 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
>>
>>
>>
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