PETEW Posted December 11, 2008 Share Posted December 11, 2008 Hey guys. I bought 2003Z's 240Z 4 months ago and have been doing some mods to fit me a little better. I like the way the car performs right now but would like a little more power. Right now the car has a P90 head with a Stage 2 cam, Nissan Motorsports (Euro) Flat top pistons, header, 2.5 " exhaust, etc. I am looking at shaving the head or even buying a different head. Right now the car should have about 8.6-8.9 compression ratio depending what gasket is being used. I have the opportunity to buy a N42 head that has been worked on by Rebello. It has their cam in it, as well as springs, etc. The guy is asking a very fair price, especially considering what Rebello charges for port work. With a N42 head compression would go to 10-10.3, which I have heard can be used with 93 pump gas. My big problem is, I can't find any specs on these pistons and don't know if there will be clearance problems with the valves and pistons. I have heard that the pistons are truly domed pistons and take away about 1.81 cc from the chamber volume. I just don't know if I would have to take the pistons out and have valve reliefs cut in to do this. The engine is so fresh (less than 3k mi) that I don't think I want to go through this to do it. If anyone has any info on these pistons and what heads I can use with them, it would be helpful. Thanks. Quote Link to comment Share on other sites More sharing options...
PETEW Posted December 13, 2008 Author Share Posted December 13, 2008 Bueller.........Bueller.....Anyone? I was afraid of this. Finding info on these pistons is impossible it seems. I don't know if they were designed with the p90 head in mind, or ........? Quote Link to comment Share on other sites More sharing options...
woldson Posted December 13, 2008 Share Posted December 13, 2008 Between the domed pistons and the n42 won't your conpression be sky high? If the engine you have is solid right now, how about turbo? Your conpression is good. No intercooler just turbo and say... 5psi boost? Quote Link to comment Share on other sites More sharing options...
PETEW Posted December 13, 2008 Author Share Posted December 13, 2008 Between the domed pistons and the n42 won't your conpression be sky high?If the engine you have is solid right now, how about turbo? Your conpression is good. No intercooler just turbo and say... 5psi boost? Supposedly with the N42 and what I can find about these pistons I would be at 10-10.3 compression ratio (if the engine calcs and info I have are right). I have seen guys running that on the 93 available here in PA. I am just worried about clearance issues. Right now the motor is under 9 to 1 compression. Quote Link to comment Share on other sites More sharing options...
chicago240z Posted January 14, 2009 Share Posted January 14, 2009 hey Pete did you ever buy that n42 head or is it still available from your buddy email me at andykyrk@yahoo.com thanks Quote Link to comment Share on other sites More sharing options...
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