78 280zcar Posted April 8, 2006 Share Posted April 8, 2006 OK, I have an N42 block and getting ready to put a P79 head on it because my N47 was cracked and I just bought some flat top pistons. The guy I bought them off of said that they are from an 80' F54 block, but from my understanding is that they only had the F54 block in the 81-83 zx's, but I am trying to figure out what year zx to get the rings for , or will 78 rings work, they are standard pistons it looks like the first ring groove is 1.5mm, the second groove is 2.0mm and the oil groove is 4.0mm. The first ring groove is suppose to be 2.0mm, that is what the how to rebuild nissan/datsun book says but they say P79 on the top of the pistons:shock: . Please help Quote Link to comment Share on other sites More sharing options...
78 280zcar Posted April 8, 2006 Author Share Posted April 8, 2006 I figured it out. Thanks anyways. Does anyone know what kind of horsepower I will have with this setup, all stock except throttle body upgrade and JSK fuel rail(which is not an upgrade). I know the P79 isnt a very good head, but I paid a total of 240.00 for both the head and the pistons and rods Quote Link to comment Share on other sites More sharing options...
oinojo Posted April 10, 2006 Share Posted April 10, 2006 your compression would be in the 7's i believe... Quote Link to comment Share on other sites More sharing options...
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