blue 72 Posted June 4, 2009 Share #13 Posted June 4, 2009 E31, E88, N47, P90 = Square portN47, P79 = Round portThose are just the most common heads from the U.S. Link to comment Share on other sites More sharing options...
texasz Posted June 6, 2009 Share #14 Posted June 6, 2009 (edited) E31, E88, N47, P90 = Square portN47, P79 = Round port Those are just the most common heads from the U.S. You mean: E31, E88, N42, P90, P90a = Square port N47, P79 = Round port Also, if the head is original to the '83 and it is in deed a P90 variety it's going to be a P90a. What's the difference you ask? I'm glad you asked...the P90a has hydrolic lifters. From everything I have ever read you do not want the hydrolic lifters. Do a search on this topic and you should find plenty of reading material to keep you busy for a while. Also for what it's worth there were two different versions of the E88 head made, I believe that the better version was original to the '71 and '72 cars while the less desireable one came on the '73 cars. Again, do a search on this topic and you'll find more detailed info. One good resource is Bryan Little's Z Garage site: http://datsunzgarage.com/ Edited June 6, 2009 by texasz Link to comment Share on other sites More sharing options...
saridout Posted June 7, 2009 Author Share #15 Posted June 7, 2009 after angsting over this for weeks, i've finally decided to just buy a well-rebuilt N42. no fuss, no muss, and i'll never have to worry about it again. thanks for all yall's input. i really appreciate it. Link to comment Share on other sites More sharing options...
saridout Posted June 15, 2009 Author Share #16 Posted June 15, 2009 if it comes to buying a new set of pistons, does anyone have any inexpensive recommendations? Link to comment Share on other sites More sharing options...
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