rick240zed Posted April 29, 2014 Share Posted April 29, 2014 (edited) Hi, I have an opportunity to buy some new valve springs for my rebuild. In the ad they were identified as Nissan Competition, but I am afraid they may be just stock. Part numbers are: 13203-25502 13204-23000 In Google searches they show up as Nissan Spring-Valve. So I suspect plain OEM not performance. Am I right? From reading threads I have seen rule of thumb that stock springs should not see more the .460 cam lift. Some of the cams I am considering are in the .470 and .475 range. Would these springs work, or should i keep looking? UPDATE: I have found parts diagrams that identify them as for Fairlady 2000 (the U20 engine). Are they stiffer than stock Z, or do I need to keep looking? Edited April 29, 2014 by rick240zed Quote Link to comment Share on other sites More sharing options...
rick240zed Posted May 10, 2014 Author Share Posted May 10, 2014 Didn't want to risk it, and couldn't get a defnitive and authoritative "yes, they would work" so i ordered OEM L6 valve springs. Quote Link to comment Share on other sites More sharing options...
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