83ZXER Posted January 12, 2009 Share Posted January 12, 2009 I've got a p79 head that i am rebuilding for my z. I've got everyting off and I'm in the process of cleaning all the parts. Today i was cleaning the valves up and i noticed that 1 of the exaust valves is different from the other 5. The five that are the same have a Datsun symbol and an E on the valve face. the one that is different just says EX on it, and it has 2770 stamped into the valve stem near the top. WHAT THE HELL IS UP WITH THAT? Quote Link to comment Share on other sites More sharing options...
Hyuri Posted January 12, 2009 Share Posted January 12, 2009 The original valve was probably damaged somewhere along the way and replaced during a top-end. I've seen this done a few times and was taught that it was a normal practice (replacing a single valve). As long as the dimensions and weight are within the same range as the other valves and everything fits and seals properly, I don't see it being a problem. Quote Link to comment Share on other sites More sharing options...
83ZXER Posted January 12, 2009 Author Share Posted January 12, 2009 I thought that was it but what did this other valve come from? the dish in the valve face is a little deeper too. I like the deeper dish for slightly lower compression (I'm thinking of going turbo) Quote Link to comment Share on other sites More sharing options...
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