doggydpit Posted June 14, 2016 Share Posted June 14, 2016 Alright L series engine gurus - need help. identify this head! Its a N42 head, but it has external oil squirters for cam and ROUND ports! And one bracket on the side that is not common on L series heads... What can this be? Started reading on forums but theres no clear info about this, only one guy asking the same thing as i do .... Ports it self on the head are square, just at the end they finish up just like some sort of round sleeves... But ports are not welded, they are casted this way... This head came of 78' 280z automatic, head was changed for sure as it was looking fairly clean on the engine... Quote Link to comment Share on other sites More sharing options...
NewZed Posted June 14, 2016 Share Posted June 14, 2016 That is odd looking. My 76 N42 has the same type of font, little 4, big 2, but it doesn't have the casting port remnant, the square stub, next to it like yours. Could be a head from Asia, from one of the JDM-type suppliers. They didn't go to the emissions heads, with liners, for quite a while after the USA did, apparently. Tony D has posted on the general topic, I believe. Maybe it's a linerless head designed to use the round exhaust manifolds that the liner heads used. The liners probably add cost and complexity. Quote Link to comment Share on other sites More sharing options...
NewZed Posted June 14, 2016 Share Posted June 14, 2016 (edited) Post the diameter of the round exhaust ports and I can compare to my squares (rectangles). To see if it's just somebody's fancy porting job. Although that won't explain the casting stub (sprue). Edited June 14, 2016 by NewZed Quote Link to comment Share on other sites More sharing options...
Tony D Posted June 16, 2016 Share Posted June 16, 2016 (edited) That bracket is welded onto the head, so it's not stock. When you say'ports in head are square, but finish in round sleeves.... you mean they are aluminum ports and no thin sheetmetal liners? For a 78, that car would have had an N47, and my bet is this is something like an ATK Remanufactured head by a place that welded up the exhaust ports and added a CHT sensor on the side.When all the cores you have are N47 but you need round ports and a CHT sensor boss...what do you do?The roundness and chamfer of the ports makes it look very un-Nissan OEM. I have a confirmed 77 N42 Carburetted head from a Nissan Cedric in my 73, and it's rectangular ports just like any other N42. Edited June 16, 2016 by Tony D Quote Link to comment Share on other sites More sharing options...
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