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Alternate U20 heads?

To: "datsun-roadsters@autox.team.net" <datsun-roadsters@autox.team.net>,
Subject: Alternate U20 heads?
From: David & Candy Pina <casalp@earthlink.net>
Date: Sun, 15 Dec 2002 21:30:13 -0800
I took what I thought was a U20 head, that is that it came off a U20 
engine, to have it pressure checked and milled. I was told that it was 
not a U20 head, but a Z20 head, made in China. There was a newer version 
head called  Z23 head that also was made in China, for the U20 block. I 
noticed that my "Z20" head had bigger water passage openings, but 
attributed that to the work of the shop that had done the porting, 
polishing, and CCing of the head. Is this the FIA head? Can anyone give 
me any other info or was I being misled?

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