denny411 Posted September 17, 2003 Author Share Posted September 17, 2003 On the passenger side of the head, look at the base of the head(just above where it meets the block). The I.D.# will be in this vicinity just below the #1 and 2 spark plug holes. Quote Link to comment Share on other sites More sharing options...
j260z Posted September 17, 2003 Share Posted September 17, 2003 here is what i found for serial # HLS30 - 133898 at this site http://www.datsunzclub.net/zcarserialnumbers.html 240z L24 1973 7/72 - 7/73 120001 - 172732 hope it helps. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted September 23, 2003 Share Posted September 23, 2003 Check the coolant passages! They very commonly rot on the E31. Also realize that if you want a really good performing head you'll be putting in bigger intake valves and seats. Not hard, but more expensive than finding a later head and doing a valve job. I kinda like the idea of milling a P90 to get compression myself. Wish I had known about it when I built my engine 6 years ago. Jon Quote Link to comment Share on other sites More sharing options...
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