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  1. #1
    RXP 260 X Short Course Veteran RXP244's Avatar
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    Who has seen this?

    Its only on the inlet valve seats, not all of them, just 3 or 4 and not on the seating surface. Just outside it. Its like the seat material has just broken away. Stock Cam, Riva Springs, Ferrea Valves, 9100rpm limit. Tune good.
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  2. #2
    800AMSOIL4U's Avatar
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    It looks like you have had detonation on the head itself. Right by the spark plug. Between the two valves.

  3. #3
    GasResearch-VT.SE's Avatar
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    That part of the head is usually pretty rough.

    It could be from sucking in junk or sand or could be anything like valve spring pressure at rpm causing this... Hard to say, but no I've never seen it.

  4. #4
    RXP 260 X Short Course Veteran RXP244's Avatar
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    Quote Originally Posted by 800AMSOIL4U View Post
    It looks like you have had detonation on the head itself. Right by the spark plug. Between the two valves.
    I can see where your referring to. But I had another look and I think its just the standard casting texture. All cylinders are the same and I recall it looking that way when it was first assembled. I am not ruling out deto as the cause of the damage to the valve seats.

    But has anyone seen this type of degradation of the their own valve seats.

  5. #5
    RXP 260 X Short Course Veteran RXP244's Avatar
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    Quote Originally Posted by GasResearch-VT.SE View Post
    That part of the head is usually pretty rough.

    It could be from sucking in junk or sand or could be anything like valve spring pressure at rpm causing this... Hard to say, but no I've never seen it.
    Always run a filter and intake plumbing is clean of debris. The spring pressure is also something I'm worried about because I plan on runner stronger springs again, gruntier cam and turning more rpm!

  6. #6
    is that a broken guide also?

  7. #7
    RXP 260 X Short Course Veteran RXP244's Avatar
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    Quote Originally Posted by winterstick View Post
    is that a broken guide also?
    Good eyes We had a little float we think, and its dropped a valve. The Riva gear is really good upto 9k. Just not past it!!! It was only when we pulled the head and found this other little issue.

    Its going to go back together with new springs and retainers good for 11k. Longer bronze valve guides, possibly a port job and a higher lift cam good for 10k.

  8. #8
    Sturm215's Avatar
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    Quote Originally Posted by RXP244 View Post
    Quote Originally Posted by 800AMSOIL4U View Post
    It looks like you have had detonation on the head itself. Right by the spark plug. Between the two valves.


    But has anyone seen this type of degradation of the their own valve seats.
    I have seen a few of them get fixed... Slow91 can take care of that... seem him fix quite a few. Maybe he can elaborate more on the issue.

  9. #9
    Site Admin Green Hulk's Avatar
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    could be valve float?
    You will also need light weight valves such as the Riva/Ferrea valves or the Supertech valves.
    I have either in stock in the store.

  10. #10
    Duke's Avatar
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    Quote Originally Posted by Green Hulk View Post
    could be valve float?
    You will also need light weight valves such as the Riva/Ferrea valves or the Supertech valves.
    I have either in stock in the store.
    He is already running Ferrea valves, should be good for 9.5k with the stock cam IMO.

    Slow had indicated a while ago he was seeing even stock setups do this on a particular batch of heads. Don't remember what year etc..

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