No this is not a comp cam, the comp cam is installed into the engine.
This is the cam I removed to install the comp cam (XE256H).
But now i would replace the cam again due the broken of rocker arms of intake valve cyl. 7.
The first time the lifter collapsed, for two times the rocker has broken and one time the stud has broken. This is enough for me.
I found a forum explain that more lift cause interference between rocker arm and stud using the stock components, but I don't understand why all the others rockers works properly.
Anyway the cam of the picture was installed in the engine from the time I purchased the car.
Thank you for your reply.
Marco.

Yes, the lifter has been replaced.
Now I have replaced also the rocker arm and the engine run good but I don't use the car.
My idea is that the rocker arm is not free to complete his stroke to open the valve due to the stud interference and the pushrod absorbed this lack (it's enough a little interference). But after several hammerings the weakest part breakes. 

You should be able to see any contact with the rocker.  If the rocker is hitting something there would be a shiny spot on it.  I've never heard of the rocker hitting the stud.  I have heard of a rocker hitting the vale spring retainer.  Again, there would be a witness mark on the rocker.  When in doubt you can mock it up with clay between the components you think hit and see if they really do.  The thickness of the clay can then be measured to determine clearance.  Clearance will be less when at operating temperature, and to check it you need to temporarily install a solid lifter on the cam, as a hydraulic lifter will just collapse instead of giving you a reliable test. 

Did you install matching valve springs when you installed the XE256H cam? 

Who set the installed height on the springs?  Another thing to consider is coil bind.  If the springs are installed too short that's a very real possibility.  It could be that the one you're having issues with is just a hair tighter than the others.  Its another thing to check at max lift. 

I would check those heights, and if they are different I would pull the head and get it fixed.  You may get around the issue by using a cam that has less lift, but its a band aide fix.

Your English is quite good.  These are complex mechanical things we are discussing, using specific words not commonly learned in the process of learning a second language.  Conversational language use is easy.  Where's the bathroom, how are you, etc.  This kind of stuff, even if you are fluent is tough.  I learned a whole lot of new words in Spanish on my recent trip to Puerto Rico to volunteer rebuilding from hurricane Maria.  I've spoken the language for years, but the terms for construction stuff, even though I work in construction, often left me searching for a word.  "Another beer, please" is a lot more common than "I need to sharpen this chisel". 

Uno mas cervesa por favor is all the Spanish one needs to know.

josh-kebob wrote:

rpm wrote:

Uno mas cervesa por favor is all the Spanish one needs to know.

Only one cervesa???

Yeah ... but you say it a lot.
 

So, if you if you will be in Italy you need to know... "un'altra birra media per favore..."
("Donde esta el bano?") "dov'è il bagno?"...maybe after three "birre medie" you need it.

Within this week i'll take the quote for the valve position, I agree with 6sally6, if necessary I will work on the valve seat. So I understand that the camshaft I removed to install the compcam was not the original one.Once again I am happy to spend time exchanging opinions and focusing on the problem to arrive at its solution. This serves to increase culture, at any age. thank you guys.Marco

Marco wrote:

So, if you if you will be in Italy you need to know... "un'altra birra media per favore..."
("Donde esta el bano?") "dov'è il bagno?"...maybe after three "birre medie" you need it.

Within this week i'll take the quote for the valve position, I agree with 6sally6, if necessary I will work on the valve seat. So I understand that the camshaft I removed to install the compcam was not the original one.Once again I am happy to spend time exchanging opinions and focusing on the problem to arrive at its solution. This serves to increase culture, at any age. thank you guys.Marco

Pretty close to Espanol.  I'll keep that in mind when I finally make it to Italy!

Let us know how this ends up Marco, and good luck (buena suerte, bon chance, must be close?).
 

I believe you could find hardened valve stem caps of various thickness to bring the rocker back into proper geometry.  Effectively they make the valve stem a bit longer.

Or, order some slightly shorter push rods.

BB

351MooseStang wrote:

Something to consider...

One thing that you really need to pay attention to is the sweep of the rocker tip on the end of the valve stem. If your pushrod is OEM length and one valve stem tip is lower than the others, your rocker tip sweep will be wide and not centered on the tip of the stem. You want to position the rocker tip/ valve stem tip contact area so it's furthest away from the stud at mid lift so that your sweep is centered and narrow.

The rocker describes a circle in its movement, which means that the rocker tip / valve stem tip contact patch moves back and forth as the valve is opened and closed. Improperly positioning the rocker tip can lead to side-loading the valve guides, wearing them out prematurely. With a valve stem tip sitting lower than the others, your rocker geometry is off on that valve unless you are using a shorter pushrod to correct it. The fact that your rocker stud slot is hitting where it is tells me that the geometry on that valve is way off,.

The best way to check for rocker tip sweep is to get a set of adjustable pushrods, put a set of light springs on a pair of valves and set them up properly with a centered and narrow sweep. Then measure your adjustable pushrods to see if the ones you have been using are right.

I go through this on every engine I build to ensure I have the correct length pushrods.  You need a solid lifter for it, because a hydraulic will collapse instead of operating the rocker correctly.  You can buy lifters individually, and it won't hurt a hydraulic cam running a solid lifter on it. 

Nice drawings BTW.