rocker arm stud diflection
 

How much is normal? I am running good roller rockers with the 641 hyd roller cam. aftermarket oversize push rods with ARP studs.
I am running the stock valve covers with the oil drippers removed and noticed a bump in the cover next to the oil fill hole. removed the cover and all of the rockers seam to be properly adjusted with out tearing into it. There is a rub mark on the bottom of the cover that shows that the lock nut is moving more than 1/4 inch. I find this hard to believe that it could flex that much without breaking. I have snapped cheaper studs on other motors in the past.

Do you Have the rocker corner ground away? I believe #1 and #8 intake. I didn't grind mine enough and it was deflecting my valve cover a bit. Might not be your problem just throwing thoughts out there.

i don,t think it could flex that far without breaking.

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These are not the rocker arms that you need to grind the corners.
You can see the mark on the underside of the cover.

There are marks from other nuts on the underside of the cover but none of them show this sign of movement.

This is the engine that has been in the Daytona for the last year. It runs perfect with NO strange noises.

Sounds like the stud may be loose in the head? If it moves 1/4 inch (which I think it would snap) you are diminishing lift/duration. check every one close.

Do you think that at one time it did snap one off and that is the the prior damage? If you put the cover back on does it spot off on the nut? When my rockers were touching my covers I could hear a distinct hollow noise. Throwing ideas out.

Before the motor goes back into the boat it WILL be checked out.
I am in the process of stripping the boat ao it can go to the gel coat repair guy to have everything fixed that the previous owner did. I am also adding an extension box so some of the holes on the transom need to be filled. AND I am raising said box 1 inch and going from a standard deck to a tall deck block that will raise and spread the exhaust ports. And reworking the dash.

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That rocker is on the base circle of the cam and nothing seems to be loose. I will check it out before it goes back into the boat.
The broken rocker arm stud was a few engines ago.

Or permanent deflection.