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Non-member
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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Non-member
Re: Different valve spring seats in heads
Phase 1 - phase 2 ? Just a guess!!!
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Committee Member
Re: Different valve spring seats in heads
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Non-member
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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Non-member
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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Committee Member
Re: Different valve spring seats in heads
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Committee Member
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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