blown hg and valves hitting the pistons...help

[licenced2burn]

I had my truck studded last fall and its been in the shop for 10weeks and i just heard back from them today. They said my hg were blown worse then they have ever seen and almost all the valves have touched the pistons. They said its from over reving the engine. I have innovative xrace tune i run as a dd and my shift points are right at 4k and they shift superfast. What else can cause this? Im afraid the shop is gunna try to not warrantee the hg and thats to expensive to redo every 8-10months.

[F250SixOH]

IMO if they did the job before they took too much off of the heads thus decreasing the valve to piston clearance. If so, they are at fault.

[Evil Eye]

Valve to piston contact can occur exactly like they are saying. When your engine revs so high, the valves can float - meaning that they don't compress all the way back to fully seat before being opened again. This can allow them to remain open and contact the pistons.

[F250SixOH]

Originally Posted by Evil Eye

Valve to piston contact can occur exactly like they are saying. When your engine revs so high, the valves can float - meaning that they don't compress all the way back to fully seat before being opened again. This can allow them to remain open and contact the pistons.

Correct, but how come almost everyone else can run those tunes and drive like a mad man and never have these issues? I think his prior work is to blame if he is in fact right about his shift RPMs. Just my 2c

[licenced2burn]

They said they checked the clearances from the valves to the heads and it was "well within spec".

[Evil Eye]

I would tend to agree. I didn't read in your original post where they did anything to the heads when the HG's were replaced. Did they "shave" them down to get them flat and true? What about the block?

***Edit: Well, that answers that.

[licenced2burn]

When i did the head studs because my stock gaskets were blown they fixed a crack in my head and never even gave me the option of just replacing it. The head shop is separate from the place that did my hg. I just think its odd they blew and then my valves are hitting also when i didnt have the problem before getting studded.

[licenced2burn]

The did plane the heads and fix the one crack the last time. And they just told me today they still looked fine and all the clearances were right. Could it be possible my valve springs are getting weak? I have 170k on my truck