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| Title: |
  Heavyweight single valve guides |
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6156 |
| Rating: |
Rating:10 Votes:2 (Rating Scale: 1 = worst, 10 = best)
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| Added on: |
07 Oct 2008 |
| Author/Source: |
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| Posted by: |
nodrogdax |
| Comments: |
2 Comment(s)
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By TommoT
07 Oct 2008
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Exactly, this happens all the time. The hole for the exhaust guide was considerably larger when I did mine. Conclusion must be that you can never use a standard guide if it has ever been changed before.
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By GDPR removal 93151
03 Oct 2010
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I too have encountered oversize exhaust guide apertures, I removed a pair of bronze/brass guides from an alloy 350 head in accordance with the original service manual (heated head then pushed downwards) only to find the new valve guides drop straight through, measurement showed the bronze guides had flared at the top when being drifted out and enlarged the aperture - would this have happenned if driven upward? - A custom set of oversize guides was the only solution.
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