[Roadsters] Non smog U20 SU needles True or False?

[Gary and Cindy Ault]

Tom,

According to my Nissan parts book, N-25s were used in NAIS-equipped cars, 
and N-17s were used in pre-emissions controlled cars.  I run N-17s in my '69 
U20 from which I removed the NAIS system in 1972.

The complete NAIS system, including a working fan clutch, has been stored in 
a box since 1972.  The engine had about 20,000 miles on it when I removed 
the system prior to transplanting the motor into my '66 1600.  I suppose 
it's time to put the system on eBay.

Gary

----- Original Message ----- 
From: "Tom PRATHER" <tomet9 at sbcglobal.net>
To: <datsun-roadsters at autox.team.net>
Sent: Monday, June 20, 2011 12:37 PM
Subject: [Roadsters] Non smog U20 SU needles True or False?


>I no longer run SU's but never got a definitive answer on this in the past 
>so I thought I'd bring it up again. Some of you may want know. I frequently 
>see advertised N17 as non smog needles. So was there ever a smog needle? 
>Inquiring minds want to know. In the past when I fiddled with SU's I 
>remember buying a set of N25 from Dean. He never came out to say that they 
>were infact smog needles, just that they would perform better for my stock 
>U20. Was there any needle ever offered from the factory other than n17 
>stock?
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