Patcon Posted May 13, 2015 Share #13 Posted May 13, 2015 Glad you found another head. I hate it that the first one was bad. It was good they took care of you. The crank has some markings on it below the bearing journal that looks like old rust pitting even though they are not black. Link to comment Share on other sites More sharing options...
madkaw Posted May 14, 2015 Author Share #14 Posted May 14, 2015 I was actually amazed the guy just gave me a full credit-- sight unseen. The next one coming has a bent valve, but he guaranteed it would pass a pressure test.I might take a stab at straightening the head. I might as well since it is free. It will be my guinea pig head to practice unshrouding and measuring and cutting and...... Link to comment Share on other sites More sharing options...
Patcon Posted May 14, 2015 Share #15 Posted May 14, 2015 How would straighten it? Shave it flat or some other method? Link to comment Share on other sites More sharing options...
madkaw Posted May 14, 2015 Author Share #16 Posted May 14, 2015 A big oven, big piece of steel and patience. Link to comment Share on other sites More sharing options...
Captain Obvious Posted May 14, 2015 Share #17 Posted May 14, 2015 A big oven, big piece of steel and patience. That's crazy talk!! Link to comment Share on other sites More sharing options...
madkaw Posted May 14, 2015 Author Share #18 Posted May 14, 2015 I guess I'm crazy then- Link to comment Share on other sites More sharing options...
Kennymonster Posted May 14, 2015 Share #19 Posted May 14, 2015 I also have one sitting in my garage if you want moar maxima heads On a stock dished block with less than average compression, and a very mild cam, I put down 150rwhp which wasn't too bad for not doing any headwork. Link to comment Share on other sites More sharing options...
siteunseen Posted May 14, 2015 Share #20 Posted May 14, 2015 Also interesting to me that the pistons all were labeled P79, I wasn't aware that Nissan did that. Am I assuming too much? I've got 6 that are stamped the same as yours but mine all have "5" instead of "3". I'll look at the main caps for those dots this afternoon, haven't cleaned them yet. Link to comment Share on other sites More sharing options...
madkaw Posted May 14, 2015 Author Share #21 Posted May 14, 2015 I've got 6 that are stamped the same as yours but mine all have "5" instead of "3". I'll look at the main caps for those dots this afternoon, haven't cleaned them yet. Interesting. Link to comment Share on other sites More sharing options...
siteunseen Posted May 15, 2015 Share #22 Posted May 15, 2015 Okay, the turbo dished pistons have the "5" stamped in them. P79s have a couple of different numbers on them. I've read that was a way of internal balancing for the ZXs, pistons close to each other in weight are stamped the same. I don't know that to be a fact though. Those dots on your main caps aren't on any of mine. Could that be a way of numbering them from a mechanic? Link to comment Share on other sites More sharing options...
madkaw Posted May 15, 2015 Author Share #23 Posted May 15, 2015 Thanks Cliff. Maybe my engine has been cracked open before. It was pretty dirty inside like old used oil, but maybe there's nothing to that. I believe on these motors all the bearing caps not numbered are supposedly interchangeable. Link to comment Share on other sites More sharing options...
240260280z Posted May 15, 2015 Share #24 Posted May 15, 2015 There may be numbers on the side of the caps Link to comment Share on other sites More sharing options...
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