big-phil Posted March 5, 2006 Share Posted March 5, 2006 I now have the N47 head with small round exhaust ports, I've seen the E88 head, and it looks like the P90, with squar exhaust ports. Then I've also read about the heads that came on the 240z's. I don't want my compression any higher than stock, I think all mine are at about 165-170 psi per cyclinder? But I don't really want to go any lower. I have a P90 that I bought, and was originally going to put on, but I don't want to lower my compression that much. It feels great right now, but if say and E88 head would flow better, and I can keep the same compression I think I would be happy? Quote Link to comment Share on other sites More sharing options...
zane9000 Posted March 5, 2006 Share Posted March 5, 2006 My understanding is that the E88 would give you higher compression and does not flow as well as the n47 unless you do alot of work to it. Why not just get your n47 ported out and maybe a lightened valve train? Quote Link to comment Share on other sites More sharing options...
big-phil Posted March 6, 2006 Author Share Posted March 6, 2006 the n47 has steel inserts in the exhaust ports. I don't think you can port it out? Has anyone taken the steel things out ??? Quote Link to comment Share on other sites More sharing options...
zane9000 Posted March 6, 2006 Share Posted March 6, 2006 lol, I forgot about those. I have heard of people removing the inserts (or part of the inserts) but its supposed to be pretty tough to do. Why dont you want to go with a turbo head? Are you afraid of lowering compression? Quote Link to comment Share on other sites More sharing options...
big-phil Posted March 6, 2006 Author Share Posted March 6, 2006 yes, it feels so good now I really don't want to lower the compression and end up with less power off boost. When I first put my turbo setup together I put the turbo throttle body on, and it felt so under powerd untill boost came on. so I put my TB back on wich I think is a 60mm? Its much bigger than the turbo TB. So I want to keep my compression, but have better flow. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted March 6, 2006 Share Posted March 6, 2006 How about an N42? Same head you have now with square exhaust ports. E88 comes in about 4 variations and has smaller valves, so it won't flow as well without mods. P90 might be OK if you shave the crap out of if. Check the P79 and P90 pages on this site for more details on the P90. http://www.geocities.com/zgarage2001/z.html Quote Link to comment Share on other sites More sharing options...
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