boostin280zx Posted November 17, 2006 Share Posted November 17, 2006 I have a rebuild motor out of a '76 280z. It says its a n42 block and head. I was wondering if my '82 p90 head and oil pan will bolt up and have the same oil holes. Does the f54 block have the same oil holes as the n42? Quote Link to comment Share on other sites More sharing options...
boostin280zx Posted November 17, 2006 Author Share Posted November 17, 2006 I just took a n42 head cast i have and put one of my old head gaskets i have been using with the f54/p90 over it. It looks like its the same gasket. But on autozone.com it says they call for two different gaskets???? Quote Link to comment Share on other sites More sharing options...
ezzzzzzz Posted November 17, 2006 Share Posted November 17, 2006 On the later turbo motors there is an additional water jacket hole just behind the second to last head bolt on the manifold side (located between the 5th and 6th cylinders). This hole must be covered to prevent a leak. The later head gasket accomodates this while the earlier gaskets do not. A photo of the difference can be seen in the "How to modify the Datsun L6" within the first few pages. I can only assume that all later blocks using the P90 or P90A head required this gasket and maybe other heads as well. Quote Link to comment Share on other sites More sharing options...
boostin280zx Posted November 24, 2006 Author Share Posted November 24, 2006 I just put the motor in as a straight n42 block and head. i blew the head gasket. im going to put the p90 head on the n42 block.. What gasket should i use??? Quote Link to comment Share on other sites More sharing options...
savageskaterkid Posted November 24, 2006 Share Posted November 24, 2006 Why swap heads? Is there something wrong with the N42? Quote Link to comment Share on other sites More sharing options...
boostin280zx Posted November 25, 2006 Author Share Posted November 25, 2006 Nothing is wrong with the head. I wanted to put the p90 on too lower the compression a little bit. Quote Link to comment Share on other sites More sharing options...
savageskaterkid Posted November 25, 2006 Share Posted November 25, 2006 IIRC the N42 compression ratio isn't that high, something like 8.25:1(don't quote me) that compression really isn't that high, but it is a bit higher then the P90. This will give you more off the line torque and won't have as much turbo lag. Quote Link to comment Share on other sites More sharing options...
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