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Chasing down low compression on my 2007 built IPP engine i found most intake valves like this. The one on the left obviously.
The two on the picture comes form the same cylinder so its safe to say i have some soft and some "hard" valves in that build. Now i rather not go with Ferrea again as a quick google session reveals soft valves on several other platforms. Some of them not long ago, so im not sure how resolved the problem actually is. But i cant seem to find to many that makes +1mm oversized valves for the z32. I just found Manley actually does (thanks for the tip Ash). Any experience with them anyone? It seems like top notch stuff though, but so did Ferrea...
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