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  1. 03-10-2013, 22:28 #1
    gttjames
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    Different valve spring seats in heads

    Just building up a head, swapping the piper springs onto a thicker head I'm going to use and noticed the seats are different. Can the wiser please enlighten me?

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  2. 03-10-2013, 22:33 #2
    greggtt
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    Re: Different valve spring seats in heads

    Phase 1 - phase 2 ? Just a guess!!!
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  3. 03-10-2013, 22:44 #3
    Sparkie
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    Re: Different valve spring seats in heads

    yep thats correct.
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  4. 04-10-2013, 09:34 #4
    gttjames
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    Re: Different valve spring seats in heads

    Did think that was a possibility. Is the dished version phase 1? I have seen 5 heads over the last few months and they have all been flat as opposed to the dish version

    I would have thought the dished version be better for holding valve spring in place, why did they change to machining it flat out of interest if anyone knows?
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  5. 04-10-2013, 10:11 #5
    SCHWARTZ
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    Re: Different valve spring seats in heads

    Possibly something to do with the fact that ph1 didn't have valve stem seals, but again beat to hear it from someone wiser.
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  6. 04-10-2013, 22:47 #6
    Sparkie
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    Re: Different valve spring seats in heads

    the answer is here....
    https://www.rtoc.org/boards/showthrea...se+differences
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  7. 04-10-2013, 22:48 #7
    Sparkie
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    Re: Different valve spring seats in heads

    ph2 sits in the bucket - probably to aid the action of the springs at high revs, as they do open out upon compression.
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